A. Kabadou - Academia.edu (original) (raw)
Papers by A. Kabadou
![Research paper thumbnail of Crystal structure of lithium ammonium hexachlorotellurate(IV), [Li0.2(NH4)0.8]2TeCl6](https://attachments.academia-assets.com/113438977/thumbnails/1.jpg)
](Zeitschrift für Kristallographie - New Crystal Structures, 2003
Cl6H6.4Lio.4N1.6Te, cubic, Frrßm (No. 225), a = 10.357(2) Â, V= 1111.0Á 3 , Z=4, RgJF) = 0.060, w... more Cl6H6.4Lio.4N1.6Te, cubic, Frrßm (No. 225), a = 10.357(2) Â, V= 1111.0Á 3 , Z=4, RgJF) = 0.060, wR Kf (F 2) = 0.149, T= 299 K. Source of material From the mixed solutions of LiCl, NH4CI and Te0 2 in concentrated HCl with the molar ratio 1:1:1, bright yellow crystals grew within several days using a desiccator filled with concentrated H2SO4 as water absorber. As for other hexachlorotellurates(IV), the crystals are very sensitive to moisture. Therefore, they were protected by paraffin oil.
Journal of Chemical Crystallography, 2010
Single crystals of iron and manganese phosphate Fe 6.36 Mn 0.64 (PO 3 (OH)) 4 (PO 4) 2 was synthe... more Single crystals of iron and manganese phosphate Fe 6.36 Mn 0.64 (PO 3 (OH)) 4 (PO 4) 2 was synthesized by hydrothermal method. The compound crystallizes in the Fe 7 (PO 4) 6 structure type and is isotypic with the solid solution M 7Àx M 0 x HPO 4 ð Þ 4 PO 4 ð Þ 2 where M is Fe, Co, Mg, Mn. The compound is triclinic, P-1, a = 6.571(5), b = 7.993(3), c = 9.547(2) Ǻ , a = 103.97(1)°, b = 109.29(2)°, c = 101.57(3)°. The structure is based on a three-dimensional framework of distorted edge-sharing MO 6 and MO 5 polyhedra, forming infinite chains, which are interlinked by corner-sharing with PO 4 tetrahedra. The formula unit is centrosymmetric, with all atoms in general positions except for one Fe atom, which has site symmetry-1.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, Jan 25, 2015
The vanadyl(IV) adenine complex; [VO(Adn)2]⋅SO4; was synthesized and characterized. The molar con... more The vanadyl(IV) adenine complex; [VO(Adn)2]⋅SO4; was synthesized and characterized. The molar conductivity of this complex was measured in DMSO solution that showed an electrolyte nature. Spectroscopic investigation of the green solid complex studied here indicate that the adenine acts as a bidentate ligand, coordinated to vanadyl(IV) ions through the nitrogen atoms N7 and nitrogen atom of amino group. Thus, from the results presented the vanadyl(IV) complex has square pyramid geometry. Further characterizations using thermal analyses and scanning electron techniques was useful. The aim of this paper was to introduce a new drug model for the diabetic complications by synthesized a novel mononuclear vanadyl(IV) adenine complex to mimic insulin action and reducing blood sugar level. The antidiabetic ability of this complex was investigated in STZ-induced diabetic mice. The results suggested that VO(IV)/adenine complex has antidiabetic activity, it improved the lipid profile, it improv...
![Research paper thumbnail of Mild hydrothermal synthesis of the two compounds [SrZn2(SeO3)3] and [SrZn0.68Cu0.32(SeO3)2]: Structural characterization, spectroscopic and magnetic studies](https://attachments.academia-assets.com/87690901/thumbnails/1.jpg)
](Journal of Saudi Chemical Society, 2018
Two new selenite SrZn 2 (SeO 3) 3 (1) and SrZn 0.68 Cu 0.32 (SeO 3) 2 (2) were synthesized by the... more Two new selenite SrZn 2 (SeO 3) 3 (1) and SrZn 0.68 Cu 0.32 (SeO 3) 2 (2) were synthesized by the hydrothermal technique under autogeneous pressure. The crystal structure of both compounds was solved from X-ray diffraction data. Compound (1) was crystallized in P 1 triclinic space group. However, compound (2) was crystallized in P2 1 /n monoclinic space group. Infrared studies confirm the presence of all vibration bands in both structures. The temperature dependence of the magnetic susceptibility was measured in the temperature range of 10-300 K at different magnetic field intensities for both compounds. No magnetic properties were detected for compound (1). Mean while, compound (2) displayed antiferromagnetic properties.
Materials Chemistry and Physics, 2015
Abstract Na-doped brownmillerite oxides La 1−x Na x SrMn 2 O 5 (x = 0, 0.1, 0.2 and 0.3) were syn... more Abstract Na-doped brownmillerite oxides La 1−x Na x SrMn 2 O 5 (x = 0, 0.1, 0.2 and 0.3) were synthesized by the solid state reaction method at high temperature. The structural and magnetic properties of the samples were investigated by X-ray diffraction and magnetization experiments. The results from X-ray diffraction analysis showed that all samples were single phase and crystallized in the orthorhombic system, with space group Pnma. This structure can be described as an oxygen-deficient perovskite, resulting in a sequence of regular alternating layers of corner-sharing BO 6 octahedra (O) and BO 4 tetraedra (T) according to axis b. The results from magnetization versus temperature measurements in a magnetic applied field of 0.05 T indicated that the samples underwent a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature T C decreased from 365 to 345 K with Na content. An electronic phase separation model considering the formation of ferromagnetic clusters in the antiferromagnetic matrix was proposed to interpret the observed magnetization results for the Na-substituted samples. Overall, the present study provided an effective approach to achieve new functional materials based on naturally occurring layered systems such as La 1−x Na x SrMn 2 O 5+δ , for possible application in the spintronics industry.
Solid State Ionics, 1999
The compounds of general formula AHgX 3 and A 2 HgX 4 (where A is monovalent cation and X a halid... more The compounds of general formula AHgX 3 and A 2 HgX 4 (where A is monovalent cation and X a halide ion) undergo structural phase transitions and interesting physical properties [1, 2 and 3]. Crystalline α-NH 4 HgCl 3 is known to undergo an orderdisorder phase transition at ...
Zeitschrift für Kristallographie - New Crystal Structures, 2003
Applied Physics A, 2011
ABSTRACT
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Zeitschrift für Kristallographie - New Crystal Structures, 2003
Zeitschrift für Kristallographie - New Crystal Structures, 2004
Materials Research Bulletin, 2010
ABSTRACT Within the Tl2O–Ag2O–TeO2 system, a large glass-forming domain was evidenced and is pres... more ABSTRACT Within the Tl2O–Ag2O–TeO2 system, a large glass-forming domain was evidenced and is presented for the fist time. Densities, glass transition (Tg) and crystallization (Tc) temperatures of the relevant glasses were measured. A structural approach of these glasses as functions of the composition was performed using Raman scattering. The Raman spectra were analysed in terms of the structural modifications induced by the Tl2O and Ag2O modifiers. It has clearly evidenced a phase separation inherent in tellurite glasses with low valence cations (as Tl+ and Ag+). The glasses would be constituted of two phases only: one of pure TeO2 and one of pure ortho-tellurite M2TeO3 (M = Ag, Tl) with the statistically mixed Ag–Tl cationic composition.
Journal of Alloys and Compounds, 1999
IOP Conference Series: Materials Science and Engineering, 2012
This study was focused on the oxidation of organic matter in phosphoric acid 54% by ozone. In ord... more This study was focused on the oxidation of organic matter in phosphoric acid 54% by ozone. In order to understand the mechanisms involved in this process, the identification of this matter upstream and downstream of the ozonation was necessary. For the identification, after an extraction by a mixture (dichloro-methanol), the organic phase was divided into two parts: the residue and the extract:-The residue was studied by infrared spectroscopy Fourier Transform (IR-TF). It contains Kerogene which is a mixture of saturated hydrocarbons with high molecular weights. The absorption bands of the FT-IR showed that the residue contains also quantities of amino that correspond to the remains of dinoflagellate cysts, which are abundant in sediments.-The extract has been the subject of a detailed study by, chromatography on silica column, IR-TF spectroscopy and CG-SM. The passage of this extract on a silica column yielded two fractions (saturated fraction and polar fraction). Both of these fractions were analyzed by CG-SM. The yield of the reduction of the organic matter content in the phosphoric acid 54% could not exceed 29%. Therefore, we can conclude that the reduction in the rate of organic matter remains limited by the fact that some compounds are inert towards ozone.
Journal of Alloys and Compounds, 2013
Iron doped brownmillerite oxides LaSrMn 2Àx Fe x O 5 (0 6 x 6 0.5) have been prepared as pure pow... more Iron doped brownmillerite oxides LaSrMn 2Àx Fe x O 5 (0 6 x 6 0.5) have been prepared as pure powders by a conventional solid state reaction and studied by X-ray powder diffraction, scanning electronic microscope and Mössbauer spectroscopy. Rietveld analysis of X-ray diffraction patterns confirms that all samples crystallize in the orthorhombic system with Pnma space group and are isotypic with the Ca 2 Fe 1.039 Mn 0.962 O 5 phase. Cell parameters and crystallite size show an anomaly around x = 0.2 which is explained by the partial substitutions of Mn 2+ and Mn 3+ by Fe 3+ and small amounts of Fe 4+. A detailed analysis of the Mössbauer spectra for all compounds measured at room temperature shows that Fe 3+ ions are located in distorted octahedral and tetrahedral sites. The environment and oxidation states of Mn and Fe are determined by bond valence sum calculations and the results for Fe are compared to the results from the Mössbauer study.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Journal of Alloys and Compounds
Abstract The crystal structure of CuTe2O5,2%Er2O3 was determined from X-ray powder diffraction da... more Abstract The crystal structure of CuTe2O5,2%Er2O3 was determined from X-ray powder diffraction data using Rietveld refinements. The new structure was solved in monoclinic system through the P21/c space group with parameters equal to a = 6.868 A, b = 9.316 A and c = 7.601 A. The structure can be described as a three dimensional network made of layers parallel to the (010) which contain two kinds of polyhedra TeO4 and TeO5 connected through a corner. These sheets are interconnected by Cu2O10 dimers. A deep spectroscopic study was carried out using the Infrared and Raman techniques in order to prove the presence of different polyhedron CuO6, Te(1)O5, and Te(2)O4E.The dielectric data were analyzed using complex permittivity (e′), (e″) and tan (δ) for the sample at various temperatures. The CuTe2O5,2%Er2O3 exhibited strong red-green emissions due to homogeneously occupied Er3+ ions in the host lattice which is confirmed by Photoluminescence.
Materials Chemistry and Physics, 2012
ABSTRACT The effects of Nd3+ addition on structure and functional properties of Na0.5Bi0.5TiO3 (N... more ABSTRACT The effects of Nd3+ addition on structure and functional properties of Na0.5Bi0.5TiO3 (NBT) are examined. X-ray crystallography has allowed the identification of a continuous solid solution with the general formula Na0.5[Bi1−xNdx]0.5TiO3. In the composition range 0 ≤ x ≤ 0.25 the structure was found to crystallize in rhombohedral symmetry while for higher Nd3+ concentrations tetragonal symmetry is favored. The functional properties are investigated in more detail for the solid solution containing 5% Nd3+ where an overall improvement of the ferroelectric properties and a rather high pyroelectric coefficient could be obtained. The fluorescence behavior of this composition is also reported. It is thought that Nd3+ doped NBT may be highly promising for a range of applications requiring lead-free ferroelectrics with improved properties.
Journal of Materials Science, 2007
The dielectric, ferroelectric, and piezoelec-tric properties of ceramic materials of compositions... more The dielectric, ferroelectric, and piezoelec-tric properties of ceramic materials of compositions (1 x)[Pb0.91La0.09(Zr0.60Ti0.40)O3]x[Pb(Mg1/3Nb2/3)O3], x = (0, 0.2, 0.4, 0.6, 0.8, and 1.0) were studied. The above compositions were prepared by mixing the individual Pb0. ...
Zeitschrift für Kristallographie - New Crystal Structures, 2003
Cl6H6.4Lio.4N1.6Te, cubic, Frrßm (No. 225), a = 10.357(2) Â, V= 1111.0Á 3 , Z=4, RgJF) = 0.060, w... more Cl6H6.4Lio.4N1.6Te, cubic, Frrßm (No. 225), a = 10.357(2) Â, V= 1111.0Á 3 , Z=4, RgJF) = 0.060, wR Kf (F 2) = 0.149, T= 299 K. Source of material From the mixed solutions of LiCl, NH4CI and Te0 2 in concentrated HCl with the molar ratio 1:1:1, bright yellow crystals grew within several days using a desiccator filled with concentrated H2SO4 as water absorber. As for other hexachlorotellurates(IV), the crystals are very sensitive to moisture. Therefore, they were protected by paraffin oil.
Journal of Chemical Crystallography, 2010
Single crystals of iron and manganese phosphate Fe 6.36 Mn 0.64 (PO 3 (OH)) 4 (PO 4) 2 was synthe... more Single crystals of iron and manganese phosphate Fe 6.36 Mn 0.64 (PO 3 (OH)) 4 (PO 4) 2 was synthesized by hydrothermal method. The compound crystallizes in the Fe 7 (PO 4) 6 structure type and is isotypic with the solid solution M 7Àx M 0 x HPO 4 ð Þ 4 PO 4 ð Þ 2 where M is Fe, Co, Mg, Mn. The compound is triclinic, P-1, a = 6.571(5), b = 7.993(3), c = 9.547(2) Ǻ , a = 103.97(1)°, b = 109.29(2)°, c = 101.57(3)°. The structure is based on a three-dimensional framework of distorted edge-sharing MO 6 and MO 5 polyhedra, forming infinite chains, which are interlinked by corner-sharing with PO 4 tetrahedra. The formula unit is centrosymmetric, with all atoms in general positions except for one Fe atom, which has site symmetry-1.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, Jan 25, 2015
The vanadyl(IV) adenine complex; [VO(Adn)2]⋅SO4; was synthesized and characterized. The molar con... more The vanadyl(IV) adenine complex; [VO(Adn)2]⋅SO4; was synthesized and characterized. The molar conductivity of this complex was measured in DMSO solution that showed an electrolyte nature. Spectroscopic investigation of the green solid complex studied here indicate that the adenine acts as a bidentate ligand, coordinated to vanadyl(IV) ions through the nitrogen atoms N7 and nitrogen atom of amino group. Thus, from the results presented the vanadyl(IV) complex has square pyramid geometry. Further characterizations using thermal analyses and scanning electron techniques was useful. The aim of this paper was to introduce a new drug model for the diabetic complications by synthesized a novel mononuclear vanadyl(IV) adenine complex to mimic insulin action and reducing blood sugar level. The antidiabetic ability of this complex was investigated in STZ-induced diabetic mice. The results suggested that VO(IV)/adenine complex has antidiabetic activity, it improved the lipid profile, it improv...
Journal of Saudi Chemical Society, 2018
Two new selenite SrZn 2 (SeO 3) 3 (1) and SrZn 0.68 Cu 0.32 (SeO 3) 2 (2) were synthesized by the... more Two new selenite SrZn 2 (SeO 3) 3 (1) and SrZn 0.68 Cu 0.32 (SeO 3) 2 (2) were synthesized by the hydrothermal technique under autogeneous pressure. The crystal structure of both compounds was solved from X-ray diffraction data. Compound (1) was crystallized in P 1 triclinic space group. However, compound (2) was crystallized in P2 1 /n monoclinic space group. Infrared studies confirm the presence of all vibration bands in both structures. The temperature dependence of the magnetic susceptibility was measured in the temperature range of 10-300 K at different magnetic field intensities for both compounds. No magnetic properties were detected for compound (1). Mean while, compound (2) displayed antiferromagnetic properties.
Materials Chemistry and Physics, 2015
Abstract Na-doped brownmillerite oxides La 1−x Na x SrMn 2 O 5 (x = 0, 0.1, 0.2 and 0.3) were syn... more Abstract Na-doped brownmillerite oxides La 1−x Na x SrMn 2 O 5 (x = 0, 0.1, 0.2 and 0.3) were synthesized by the solid state reaction method at high temperature. The structural and magnetic properties of the samples were investigated by X-ray diffraction and magnetization experiments. The results from X-ray diffraction analysis showed that all samples were single phase and crystallized in the orthorhombic system, with space group Pnma. This structure can be described as an oxygen-deficient perovskite, resulting in a sequence of regular alternating layers of corner-sharing BO 6 octahedra (O) and BO 4 tetraedra (T) according to axis b. The results from magnetization versus temperature measurements in a magnetic applied field of 0.05 T indicated that the samples underwent a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature T C decreased from 365 to 345 K with Na content. An electronic phase separation model considering the formation of ferromagnetic clusters in the antiferromagnetic matrix was proposed to interpret the observed magnetization results for the Na-substituted samples. Overall, the present study provided an effective approach to achieve new functional materials based on naturally occurring layered systems such as La 1−x Na x SrMn 2 O 5+δ , for possible application in the spintronics industry.
Solid State Ionics, 1999
The compounds of general formula AHgX 3 and A 2 HgX 4 (where A is monovalent cation and X a halid... more The compounds of general formula AHgX 3 and A 2 HgX 4 (where A is monovalent cation and X a halide ion) undergo structural phase transitions and interesting physical properties [1, 2 and 3]. Crystalline α-NH 4 HgCl 3 is known to undergo an orderdisorder phase transition at ...
Zeitschrift für Kristallographie - New Crystal Structures, 2003
Applied Physics A, 2011
ABSTRACT
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Zeitschrift für Kristallographie - New Crystal Structures, 2003
Zeitschrift für Kristallographie - New Crystal Structures, 2004
Materials Research Bulletin, 2010
ABSTRACT Within the Tl2O–Ag2O–TeO2 system, a large glass-forming domain was evidenced and is pres... more ABSTRACT Within the Tl2O–Ag2O–TeO2 system, a large glass-forming domain was evidenced and is presented for the fist time. Densities, glass transition (Tg) and crystallization (Tc) temperatures of the relevant glasses were measured. A structural approach of these glasses as functions of the composition was performed using Raman scattering. The Raman spectra were analysed in terms of the structural modifications induced by the Tl2O and Ag2O modifiers. It has clearly evidenced a phase separation inherent in tellurite glasses with low valence cations (as Tl+ and Ag+). The glasses would be constituted of two phases only: one of pure TeO2 and one of pure ortho-tellurite M2TeO3 (M = Ag, Tl) with the statistically mixed Ag–Tl cationic composition.
Journal of Alloys and Compounds, 1999
IOP Conference Series: Materials Science and Engineering, 2012
This study was focused on the oxidation of organic matter in phosphoric acid 54% by ozone. In ord... more This study was focused on the oxidation of organic matter in phosphoric acid 54% by ozone. In order to understand the mechanisms involved in this process, the identification of this matter upstream and downstream of the ozonation was necessary. For the identification, after an extraction by a mixture (dichloro-methanol), the organic phase was divided into two parts: the residue and the extract:-The residue was studied by infrared spectroscopy Fourier Transform (IR-TF). It contains Kerogene which is a mixture of saturated hydrocarbons with high molecular weights. The absorption bands of the FT-IR showed that the residue contains also quantities of amino that correspond to the remains of dinoflagellate cysts, which are abundant in sediments.-The extract has been the subject of a detailed study by, chromatography on silica column, IR-TF spectroscopy and CG-SM. The passage of this extract on a silica column yielded two fractions (saturated fraction and polar fraction). Both of these fractions were analyzed by CG-SM. The yield of the reduction of the organic matter content in the phosphoric acid 54% could not exceed 29%. Therefore, we can conclude that the reduction in the rate of organic matter remains limited by the fact that some compounds are inert towards ozone.
Journal of Alloys and Compounds, 2013
Iron doped brownmillerite oxides LaSrMn 2Àx Fe x O 5 (0 6 x 6 0.5) have been prepared as pure pow... more Iron doped brownmillerite oxides LaSrMn 2Àx Fe x O 5 (0 6 x 6 0.5) have been prepared as pure powders by a conventional solid state reaction and studied by X-ray powder diffraction, scanning electronic microscope and Mössbauer spectroscopy. Rietveld analysis of X-ray diffraction patterns confirms that all samples crystallize in the orthorhombic system with Pnma space group and are isotypic with the Ca 2 Fe 1.039 Mn 0.962 O 5 phase. Cell parameters and crystallite size show an anomaly around x = 0.2 which is explained by the partial substitutions of Mn 2+ and Mn 3+ by Fe 3+ and small amounts of Fe 4+. A detailed analysis of the Mössbauer spectra for all compounds measured at room temperature shows that Fe 3+ ions are located in distorted octahedral and tetrahedral sites. The environment and oxidation states of Mn and Fe are determined by bond valence sum calculations and the results for Fe are compared to the results from the Mössbauer study.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Journal of Alloys and Compounds
Abstract The crystal structure of CuTe2O5,2%Er2O3 was determined from X-ray powder diffraction da... more Abstract The crystal structure of CuTe2O5,2%Er2O3 was determined from X-ray powder diffraction data using Rietveld refinements. The new structure was solved in monoclinic system through the P21/c space group with parameters equal to a = 6.868 A, b = 9.316 A and c = 7.601 A. The structure can be described as a three dimensional network made of layers parallel to the (010) which contain two kinds of polyhedra TeO4 and TeO5 connected through a corner. These sheets are interconnected by Cu2O10 dimers. A deep spectroscopic study was carried out using the Infrared and Raman techniques in order to prove the presence of different polyhedron CuO6, Te(1)O5, and Te(2)O4E.The dielectric data were analyzed using complex permittivity (e′), (e″) and tan (δ) for the sample at various temperatures. The CuTe2O5,2%Er2O3 exhibited strong red-green emissions due to homogeneously occupied Er3+ ions in the host lattice which is confirmed by Photoluminescence.
Materials Chemistry and Physics, 2012
ABSTRACT The effects of Nd3+ addition on structure and functional properties of Na0.5Bi0.5TiO3 (N... more ABSTRACT The effects of Nd3+ addition on structure and functional properties of Na0.5Bi0.5TiO3 (NBT) are examined. X-ray crystallography has allowed the identification of a continuous solid solution with the general formula Na0.5[Bi1−xNdx]0.5TiO3. In the composition range 0 ≤ x ≤ 0.25 the structure was found to crystallize in rhombohedral symmetry while for higher Nd3+ concentrations tetragonal symmetry is favored. The functional properties are investigated in more detail for the solid solution containing 5% Nd3+ where an overall improvement of the ferroelectric properties and a rather high pyroelectric coefficient could be obtained. The fluorescence behavior of this composition is also reported. It is thought that Nd3+ doped NBT may be highly promising for a range of applications requiring lead-free ferroelectrics with improved properties.
Journal of Materials Science, 2007
The dielectric, ferroelectric, and piezoelec-tric properties of ceramic materials of compositions... more The dielectric, ferroelectric, and piezoelec-tric properties of ceramic materials of compositions (1 x)[Pb0.91La0.09(Zr0.60Ti0.40)O3]x[Pb(Mg1/3Nb2/3)O3], x = (0, 0.2, 0.4, 0.6, 0.8, and 1.0) were studied. The above compositions were prepared by mixing the individual Pb0. ...