Julian Plewa - Academia.edu (original) (raw)

Papers by Julian Plewa

Materials

The paper presents an analysis of rotating rigid unit (RRU) auxetic structures, the special prope... more The paper presents an analysis of rotating rigid unit (RRU) auxetic structures, the special property of which is negative Poisson’s ratio. The crucial features of such modified structures are the well-functioning linkages of the square units at their pivot points. This ensures the stable functioning of such structures in tension or compression. The presented geometrical analysis of these auxetic structures may facilitate their adequate construction and allow one to determine the expected values of their expansion as well as the desired porosity. The results are confirmed based on the behaviour of physical models produced by the assembly of square units. The change in the dimensions of the physical models when moving from a closed to an open position is consistent with the predictions of the geometric models. By modifying the well-known ‘rotating squares’ model, physical structures with auxetic properties are obtained that can be utilised in industrial conditions, where a simultaneou...

Materialy Ceramiczne Ceramic Materials, 2008

Resultats experimentaux obtenus a 873 K. Au commencement, lorsque les alliages contiennent une qu... more Resultats experimentaux obtenus a 873 K. Au commencement, lorsque les alliages contiennent une quantite considerable de Zn, la vitesse du processus est elevee (4 a 6 g/cm 2 .h). Lorsque la teneur en Zn est <10%, la vitesse est beaucoup plus faible. La cinetique du processus depend de la presence des composants individuels

The phase transformation of seeded (5 mass% Fe 2 O 3 as a Fe(NO 3) 3 solution) boehmite derived a... more The phase transformation of seeded (5 mass% Fe 2 O 3 as a Fe(NO 3) 3 solution) boehmite derived alumina gel to α-Al 2 O 3 was studied with DTA technique and compared with unseeded and α-Al 2 O 3 seeded boehmite gels. Data for kinetic analysis of α-Al 2 O 3 crystallization were obtained from quantitative DTA curves. The kinetic parameters were analysed by traditional Kissinger analysis and Friedman and Ozawa-Flynn-Wall methods using the Netzsch Thermokinetics program. Results of the comparison of values of activation energies for all three gels and methods are the process of α-Al 2 O 3 transformation for originally γ-AlOOH/Fe(NO 3) 3 gels goes like that of unseeded boehmite gels, only under lower temperatures (lower about 200°C).

Journal of Thermal Analysis, 1987

The thermodynamic analysis and the results of thermogravimetric investigation of the reduction of... more The thermodynamic analysis and the results of thermogravimetric investigation of the reduction of magnesium sulfate by carbon oxide are reported.The isothermal experiments were carried out in the temperature range 640 to 675°. A shrinking-core model was found to fit the reaction rate. An activation energy of 209.7±8.6 kJ/mol was obtained.ZusammenfassungEs wird über thermodynamische Analyse und Resultate einer thermogravimetrischen Untersuchung der Reduktion von Magnesiumsulfat mit Kohlendioxid berichtet. Die isothermen Experimente wurden im Temperaturbereich 640 bis 675° durchgeführt. Zur Erklärung der Reaktionsgeschwindigkeit wurde eine Shrinking-Modell gefunden. Es wurde eine Aktivierungsenergie von 209.7±8.6 kJ/mol erhlten.РезюмеПриведен термодинам ический анализ и результаты термогра виметрического исследования реакци и восстановления сул ьфата магния окисью углерода. Изот ермические измерения проведены в интервале температ ур 640–675°. Найдено, что скорость реакции описывается моделью сжимаемой активной з оны. Вычислена энергия ак тивации равная 209,7±8,6 кдж/моль.

Chemical Engineering Science, 1989

The reduction of copper oxide with carbon monoxide yields the formation of copper through cuprous... more The reduction of copper oxide with carbon monoxide yields the formation of copper through cuprous oxide as the intermediate product. The reaction kinetics for very fine copper oxide particles were studied by thermogravimetry. The Avrami-Erofeev equation was applied to describe kinetic curves obtained within a temperature range of 398-623 K, assuming a three-dimensional growth of nuclei. For a temperature range of 398473 K, the apparent activation energy was 44 kJ/mol, at temperatures above 473 K the apparent activation energy approached almost zero.

Archives of Metallurgy and Materials, 2009

Streszczenie angielskie: The (Ba1-xSrx) Ti03 ceramic solid solution in the rangę 0.3 x 0.5 was pr... more Streszczenie angielskie: The (Ba1-xSrx) Ti03 ceramic solid solution in the rangę 0.3 x 0.5 was prepared by the sol-gel method. Barium acetate, strontium acetate and tetra-butyl titanate were used as starting materials. Thermal evolution of the dried gel as well as ceramic powder was studied by simultaneous thermal analysis. The amorphous gel of BST was calcined in the furnace and pressed into pellets. The compacts were next sintered by free sintering method at temperaturę r= 1450 C. The structure, microstructure and ...

Materials

Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s rat... more Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s ratio upon stretching and deformation in the axial and transverse directions, which have numerous application possibilities. In this paper, tubular structures were realized by rolling up planar auxetic structures and using rigid square frames as unit cells. Planar and tubular structures were built from square frames that were 3D printed with plastic or laser-cut from metal. The changes in linear dimensions of the studied structures were based on a hinge mechanism, the functioning of which was experimentally verified on different solutions leading to square unit cells. To connect the square frames of the structure, an innovative solution was used in the form of rotation axes on their surface at a preset distance from the edge of the square frame. The geometric parameter thus introduced was used to determine the relative change in the size of the structure when stretched (i.e., when moving fr...

Materials

Auxetic structures exhibit unusual changes in size, expanding laterally upon stretching instead o... more Auxetic structures exhibit unusual changes in size, expanding laterally upon stretching instead of contracting. This paper presents this effect in a failsafe mode in structures made of rigid squares. We applied the concept of auxetic structures made of rigid rotating squares (from Grima and Evans) and offer a novel solution for connecting them. By introducing axes of rotation on the surface of the squares, a reliable working system is obtained, free from stress, in which the squares can come into contact with each other and completely cover the surface of the structure, or, in the open position, form regularly arranged pores. Herein, we present a new 2D auxetic metamaterial that is mathematically generated based on a theoretical relationship of the angle between the edges of a square and the position of the axis of rotation. Physical models were generated in the form of a planar structure and in the form of a circular closed structure. Such physical models confirmed our initial cons...

The article deals with auxetic structures made on the basis of suitably connected rigid rotating ... more The article deals with auxetic structures made on the basis of suitably connected rigid rotating squares (from Grima and Evans), with axes of rotation on the squares’ surface. The geometric model and the resulting relationships that allow for the determination of Poisson’s ratio are considered in detail. It is demonstrated that changing the rotation axis position does not affect the negative Poisson’s ratio, equal to -1. The models built confirm the initial considerations and can offer new application possibilities.

The invention relates to garnet-structured phosphors of the formula I (Ya, Lub, Sec, Tbd, The, Ir... more The invention relates to garnet-structured phosphors of the formula I (Ya, Lub, Sec, Tbd, The, Irf, Sbg) 3-x (Al5-yMgy / 2Siy / 2) O12: Cex (I) where a + b + c + d + e + f + g + h + i = 1 x = 0.005 to 0.1 and y = 0 to 4.0, as well as a method of making these phosphors and using as conversion phosphors to convert the blue or near UV Emission of an LED.

Four different structure types depending on composition and reaction temperature are known of the... more Four different structure types depending on composition and reaction temperature are known of the highly anisotropic non-stoichiometric oxide NaxCoOz. Only y-Na,CoO, (0.55 5 x 5 0.74) was reported to possess large thermopower and studied in detail. Despite the corresponding stoichiometry of y-, a'-Na..CoOl and y-, P-Na,CoO2, respectively, no phase transition has been reported for y-Na,Co02 while investigating its thermoelectric properties. This aspect motivated our study of the thermophysical behavior of y-Na,Co02 by means of TCIDTA, DSC, XRD and SEMIEDX. No phase transition is detected in air up to 1100 "C. In contrast, the decomposition of y-Na,CoO, under Ar is accompanied by the formation of aand a'-Na,Co02. Samples with various contents of a-, a'- and .y:Na.,CoO, have been prepared by heat treatment of y.Na,CoO: employing different temperatures and sinterinx atmospheres, namely Ar, air and 02. The thermoelectric properties of a- and a'-Na,CoO, were investiga...

The invention relates to thermochromic pigments selected from one or more of the pigments of the ... more The invention relates to thermochromic pigments selected from one or more of the pigments of the general formula (1) to (6) and a thermochromic coating comprising at least one layer comprising or consisting of one or more of the thermochromic pigment of the formulas (1) (2), (3), (4), (5) and / or (6), and optionally containing a temperature-resistant matrix based on one or more binders or a glass frit. The thermochromic pigments and the thermochromic coatings produced therefrom are characterized by particularly advantageous combinations of properties, whereby they are also suitable for use in household appliances, in particular as temperature indicators.

Archives of Metallurgy and Materials, 2016

Manufacturing high purity polycrystalline YAlO3 (YAP) ceramics could replace monocrystalline YAP ... more Manufacturing high purity polycrystalline YAlO3 (YAP) ceramics could replace monocrystalline YAP thus recently it is an interesting task for low cost producers of scintillators. The paper presents influence of different source of initial oxide powders (micro/nano powders of Y2O3 and Al2O3) and the method of their homogenization on the formation of a YAP phase. The solid state reaction method was used to prepare YAP powder or ceramic pellets. After preheating, all samples in the form of powders and pellets were heat-treated in the temperature range of 1050-1650 °C. DTA method was applied for examination of the phase crystallization in the tested system. X-ray diffraction method (XRD) was used for characterization of the phase composition. X-ray microanalysis (EDS) was used to control homogeneity in the small areas. Morphology of the resultant samples are presented on SEM pictures. The results show a significant influence of the starting powders on the homogeneity, purity and temperat...

The highly anisotropic oxide Na/sub x/CoO/sub 2/ exhibits promising thermoelectric properties: th... more The highly anisotropic oxide Na/sub x/CoO/sub 2/ exhibits promising thermoelectric properties: thermopower up to 150 /spl mu/V/K, electrical conductivity of 300 S/cm in combination with low thermal conductivity. Four different phases of the nonstoichiometric oxide are known: /spl alpha/-Na/sub x/CoO/sub 2/ (0.9/spl les/x/spl les/1), /spl alpha/'-Na/sub x/CoO/sub 2/ (x= 0.75), /spl beta/-Na/sub x/CoO/sub 2/ (0.55/spl les/ x /spl les/ 0.6) and /spl gamma/-Na/sub x/CoO/sub 2/ (0.55/spl les/ x /spl les/0.74) depending on composition and reaction temperature, but only /spl gamma/-Na/sub x/CoO/sub 2/ was studied in detail. The stepwise phase transition of /spl gamma/-Na/sub x/CoO/sub 2/ to /spl alpha/-Na/sub x/CoO/sub 2/ via /spl alpha/'-Na/sub x/CoO/sub 2/ in Ar atmosphere and also the influence of the crystal structure on the thermoelectric properties have been reported before. While /spl alpha/- and /spl alpha/'-Na/sub x/CoO/sub 2/ possess higher thermopower the electrical conductivity is much lower than the one of g-Na/sub x/CoO/sub 2/. In order to investigate the influence of doping on the thermoelectric properties of Na/sub x/CoO/sub 2/ we expanded our studies on the alloyed oxides Na/sub x/Co/sub 1-y/Pb/sub y/O/sub 2/ (y = 0.01, 0.02, 0.05). An improved crystallinity of the Pb substituted samples and an overall enhancement of the thermoelectric properties were observed. The composition Na/sub x/Co/sub 0.95/Pb/sub 0.05/O/sub 2/ was studied in detail. The effect of partial substitution of Co by Pb on the microstructure, thermophysical behavior and thermoelectric properties of Na/sub x/CoO/sub 2/ will be discussed here.

Physica C: Superconductivity, 2002

Abstract Shielding elements were made of bulk material or thick films. The bulk route is determin... more Abstract Shielding elements were made of bulk material or thick films. The bulk route is determined by large-scale processing. After an axial or isostatic pressing of the fine-grained powder composed of BSCCO, Y-123 and Nd-123, the material was sintered/textured and annealed in special programs. Then the characterization of the materials and a measurement of magnetic fields was done with the help of a specially constructed measuring apparatus with Hall- and SQUID-sensors. The objective of the thick film route was to get large, coated superconducting work pieces of YBCO and BSCCO (plates or cylinders) with current density of >1000 kA/cm 2 (and/or a shielding effect of >1 mT). Thick films were made by plasma spraying and paste technology. Substrates used were ZrO 2 , MgO, SrTiO 3 , BaZrO 3 and others. In some cases the work pieces were treated with laser radiation. After laser and thermal treatment the surface was more dense, the cracks were cured and the current density was increased by more than two times.

Materials

The paper presents an analysis of rotating rigid unit (RRU) auxetic structures, the special prope... more The paper presents an analysis of rotating rigid unit (RRU) auxetic structures, the special property of which is negative Poisson’s ratio. The crucial features of such modified structures are the well-functioning linkages of the square units at their pivot points. This ensures the stable functioning of such structures in tension or compression. The presented geometrical analysis of these auxetic structures may facilitate their adequate construction and allow one to determine the expected values of their expansion as well as the desired porosity. The results are confirmed based on the behaviour of physical models produced by the assembly of square units. The change in the dimensions of the physical models when moving from a closed to an open position is consistent with the predictions of the geometric models. By modifying the well-known ‘rotating squares’ model, physical structures with auxetic properties are obtained that can be utilised in industrial conditions, where a simultaneou...

Materialy Ceramiczne Ceramic Materials, 2008

Resultats experimentaux obtenus a 873 K. Au commencement, lorsque les alliages contiennent une qu... more Resultats experimentaux obtenus a 873 K. Au commencement, lorsque les alliages contiennent une quantite considerable de Zn, la vitesse du processus est elevee (4 a 6 g/cm 2 .h). Lorsque la teneur en Zn est <10%, la vitesse est beaucoup plus faible. La cinetique du processus depend de la presence des composants individuels

The phase transformation of seeded (5 mass% Fe 2 O 3 as a Fe(NO 3) 3 solution) boehmite derived a... more The phase transformation of seeded (5 mass% Fe 2 O 3 as a Fe(NO 3) 3 solution) boehmite derived alumina gel to α-Al 2 O 3 was studied with DTA technique and compared with unseeded and α-Al 2 O 3 seeded boehmite gels. Data for kinetic analysis of α-Al 2 O 3 crystallization were obtained from quantitative DTA curves. The kinetic parameters were analysed by traditional Kissinger analysis and Friedman and Ozawa-Flynn-Wall methods using the Netzsch Thermokinetics program. Results of the comparison of values of activation energies for all three gels and methods are the process of α-Al 2 O 3 transformation for originally γ-AlOOH/Fe(NO 3) 3 gels goes like that of unseeded boehmite gels, only under lower temperatures (lower about 200°C).

Journal of Thermal Analysis, 1987

The thermodynamic analysis and the results of thermogravimetric investigation of the reduction of... more The thermodynamic analysis and the results of thermogravimetric investigation of the reduction of magnesium sulfate by carbon oxide are reported.The isothermal experiments were carried out in the temperature range 640 to 675°. A shrinking-core model was found to fit the reaction rate. An activation energy of 209.7±8.6 kJ/mol was obtained.ZusammenfassungEs wird über thermodynamische Analyse und Resultate einer thermogravimetrischen Untersuchung der Reduktion von Magnesiumsulfat mit Kohlendioxid berichtet. Die isothermen Experimente wurden im Temperaturbereich 640 bis 675° durchgeführt. Zur Erklärung der Reaktionsgeschwindigkeit wurde eine Shrinking-Modell gefunden. Es wurde eine Aktivierungsenergie von 209.7±8.6 kJ/mol erhlten.РезюмеПриведен термодинам ический анализ и результаты термогра виметрического исследования реакци и восстановления сул ьфата магния окисью углерода. Изот ермические измерения проведены в интервале температ ур 640–675°. Найдено, что скорость реакции описывается моделью сжимаемой активной з оны. Вычислена энергия ак тивации равная 209,7±8,6 кдж/моль.

Chemical Engineering Science, 1989

The reduction of copper oxide with carbon monoxide yields the formation of copper through cuprous... more The reduction of copper oxide with carbon monoxide yields the formation of copper through cuprous oxide as the intermediate product. The reaction kinetics for very fine copper oxide particles were studied by thermogravimetry. The Avrami-Erofeev equation was applied to describe kinetic curves obtained within a temperature range of 398-623 K, assuming a three-dimensional growth of nuclei. For a temperature range of 398473 K, the apparent activation energy was 44 kJ/mol, at temperatures above 473 K the apparent activation energy approached almost zero.

Archives of Metallurgy and Materials, 2009

Streszczenie angielskie: The (Ba1-xSrx) Ti03 ceramic solid solution in the rangę 0.3 x 0.5 was pr... more Streszczenie angielskie: The (Ba1-xSrx) Ti03 ceramic solid solution in the rangę 0.3 x 0.5 was prepared by the sol-gel method. Barium acetate, strontium acetate and tetra-butyl titanate were used as starting materials. Thermal evolution of the dried gel as well as ceramic powder was studied by simultaneous thermal analysis. The amorphous gel of BST was calcined in the furnace and pressed into pellets. The compacts were next sintered by free sintering method at temperaturę r= 1450 C. The structure, microstructure and ...

Materials

Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s rat... more Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s ratio upon stretching and deformation in the axial and transverse directions, which have numerous application possibilities. In this paper, tubular structures were realized by rolling up planar auxetic structures and using rigid square frames as unit cells. Planar and tubular structures were built from square frames that were 3D printed with plastic or laser-cut from metal. The changes in linear dimensions of the studied structures were based on a hinge mechanism, the functioning of which was experimentally verified on different solutions leading to square unit cells. To connect the square frames of the structure, an innovative solution was used in the form of rotation axes on their surface at a preset distance from the edge of the square frame. The geometric parameter thus introduced was used to determine the relative change in the size of the structure when stretched (i.e., when moving fr...

Materials

Auxetic structures exhibit unusual changes in size, expanding laterally upon stretching instead o... more Auxetic structures exhibit unusual changes in size, expanding laterally upon stretching instead of contracting. This paper presents this effect in a failsafe mode in structures made of rigid squares. We applied the concept of auxetic structures made of rigid rotating squares (from Grima and Evans) and offer a novel solution for connecting them. By introducing axes of rotation on the surface of the squares, a reliable working system is obtained, free from stress, in which the squares can come into contact with each other and completely cover the surface of the structure, or, in the open position, form regularly arranged pores. Herein, we present a new 2D auxetic metamaterial that is mathematically generated based on a theoretical relationship of the angle between the edges of a square and the position of the axis of rotation. Physical models were generated in the form of a planar structure and in the form of a circular closed structure. Such physical models confirmed our initial cons...

The article deals with auxetic structures made on the basis of suitably connected rigid rotating ... more The article deals with auxetic structures made on the basis of suitably connected rigid rotating squares (from Grima and Evans), with axes of rotation on the squares’ surface. The geometric model and the resulting relationships that allow for the determination of Poisson’s ratio are considered in detail. It is demonstrated that changing the rotation axis position does not affect the negative Poisson’s ratio, equal to -1. The models built confirm the initial considerations and can offer new application possibilities.

The invention relates to garnet-structured phosphors of the formula I (Ya, Lub, Sec, Tbd, The, Ir... more The invention relates to garnet-structured phosphors of the formula I (Ya, Lub, Sec, Tbd, The, Irf, Sbg) 3-x (Al5-yMgy / 2Siy / 2) O12: Cex (I) where a + b + c + d + e + f + g + h + i = 1 x = 0.005 to 0.1 and y = 0 to 4.0, as well as a method of making these phosphors and using as conversion phosphors to convert the blue or near UV Emission of an LED.

Four different structure types depending on composition and reaction temperature are known of the... more Four different structure types depending on composition and reaction temperature are known of the highly anisotropic non-stoichiometric oxide NaxCoOz. Only y-Na,CoO, (0.55 5 x 5 0.74) was reported to possess large thermopower and studied in detail. Despite the corresponding stoichiometry of y-, a'-Na..CoOl and y-, P-Na,CoO2, respectively, no phase transition has been reported for y-Na,Co02 while investigating its thermoelectric properties. This aspect motivated our study of the thermophysical behavior of y-Na,Co02 by means of TCIDTA, DSC, XRD and SEMIEDX. No phase transition is detected in air up to 1100 "C. In contrast, the decomposition of y-Na,CoO, under Ar is accompanied by the formation of aand a'-Na,Co02. Samples with various contents of a-, a'- and .y:Na.,CoO, have been prepared by heat treatment of y.Na,CoO: employing different temperatures and sinterinx atmospheres, namely Ar, air and 02. The thermoelectric properties of a- and a'-Na,CoO, were investiga...

The invention relates to thermochromic pigments selected from one or more of the pigments of the ... more The invention relates to thermochromic pigments selected from one or more of the pigments of the general formula (1) to (6) and a thermochromic coating comprising at least one layer comprising or consisting of one or more of the thermochromic pigment of the formulas (1) (2), (3), (4), (5) and / or (6), and optionally containing a temperature-resistant matrix based on one or more binders or a glass frit. The thermochromic pigments and the thermochromic coatings produced therefrom are characterized by particularly advantageous combinations of properties, whereby they are also suitable for use in household appliances, in particular as temperature indicators.

Archives of Metallurgy and Materials, 2016

Manufacturing high purity polycrystalline YAlO3 (YAP) ceramics could replace monocrystalline YAP ... more Manufacturing high purity polycrystalline YAlO3 (YAP) ceramics could replace monocrystalline YAP thus recently it is an interesting task for low cost producers of scintillators. The paper presents influence of different source of initial oxide powders (micro/nano powders of Y2O3 and Al2O3) and the method of their homogenization on the formation of a YAP phase. The solid state reaction method was used to prepare YAP powder or ceramic pellets. After preheating, all samples in the form of powders and pellets were heat-treated in the temperature range of 1050-1650 °C. DTA method was applied for examination of the phase crystallization in the tested system. X-ray diffraction method (XRD) was used for characterization of the phase composition. X-ray microanalysis (EDS) was used to control homogeneity in the small areas. Morphology of the resultant samples are presented on SEM pictures. The results show a significant influence of the starting powders on the homogeneity, purity and temperat...

The highly anisotropic oxide Na/sub x/CoO/sub 2/ exhibits promising thermoelectric properties: th... more The highly anisotropic oxide Na/sub x/CoO/sub 2/ exhibits promising thermoelectric properties: thermopower up to 150 /spl mu/V/K, electrical conductivity of 300 S/cm in combination with low thermal conductivity. Four different phases of the nonstoichiometric oxide are known: /spl alpha/-Na/sub x/CoO/sub 2/ (0.9/spl les/x/spl les/1), /spl alpha/'-Na/sub x/CoO/sub 2/ (x= 0.75), /spl beta/-Na/sub x/CoO/sub 2/ (0.55/spl les/ x /spl les/ 0.6) and /spl gamma/-Na/sub x/CoO/sub 2/ (0.55/spl les/ x /spl les/0.74) depending on composition and reaction temperature, but only /spl gamma/-Na/sub x/CoO/sub 2/ was studied in detail. The stepwise phase transition of /spl gamma/-Na/sub x/CoO/sub 2/ to /spl alpha/-Na/sub x/CoO/sub 2/ via /spl alpha/'-Na/sub x/CoO/sub 2/ in Ar atmosphere and also the influence of the crystal structure on the thermoelectric properties have been reported before. While /spl alpha/- and /spl alpha/'-Na/sub x/CoO/sub 2/ possess higher thermopower the electrical conductivity is much lower than the one of g-Na/sub x/CoO/sub 2/. In order to investigate the influence of doping on the thermoelectric properties of Na/sub x/CoO/sub 2/ we expanded our studies on the alloyed oxides Na/sub x/Co/sub 1-y/Pb/sub y/O/sub 2/ (y = 0.01, 0.02, 0.05). An improved crystallinity of the Pb substituted samples and an overall enhancement of the thermoelectric properties were observed. The composition Na/sub x/Co/sub 0.95/Pb/sub 0.05/O/sub 2/ was studied in detail. The effect of partial substitution of Co by Pb on the microstructure, thermophysical behavior and thermoelectric properties of Na/sub x/CoO/sub 2/ will be discussed here.

Physica C: Superconductivity, 2002

Abstract Shielding elements were made of bulk material or thick films. The bulk route is determin... more Abstract Shielding elements were made of bulk material or thick films. The bulk route is determined by large-scale processing. After an axial or isostatic pressing of the fine-grained powder composed of BSCCO, Y-123 and Nd-123, the material was sintered/textured and annealed in special programs. Then the characterization of the materials and a measurement of magnetic fields was done with the help of a specially constructed measuring apparatus with Hall- and SQUID-sensors. The objective of the thick film route was to get large, coated superconducting work pieces of YBCO and BSCCO (plates or cylinders) with current density of >1000 kA/cm 2 (and/or a shielding effect of >1 mT). Thick films were made by plasma spraying and paste technology. Substrates used were ZrO 2 , MgO, SrTiO 3 , BaZrO 3 and others. In some cases the work pieces were treated with laser radiation. After laser and thermal treatment the surface was more dense, the cracks were cured and the current density was increased by more than two times.