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Papers by Hayet MENASRA

Materials Sciences and Applications, 2013

The structural and electrical properties of Pb[Zr x Ti 0.95−x (Mo 1/3 In 2/3) 0.05 ]O 3 piezoelec... more The structural and electrical properties of Pb[Zr x Ti 0.95−x (Mo 1/3 In 2/3) 0.05 ]O 3 piezoelectric ceramics system with the composition near the morphotropic phase boundary were investigated as a function of the Zr/Ti ratio. Studies were performed on the samples prepared by the conventional method of thermal synthesis of mixed oxides. The materials structure was investigated by X-ray diffractometry to demonstrate the coexistence of the tetragonal and rhombohedral phases. In the present system, the MPB, in which the tetragonal and rhombohedral phases coexist, is in a composition range of 0.47 ≤ x ≤ 0.50. The lattice constants of the a and c axes for the samples were calculated from the XRD patterns. Microstructure of the sintered ceramics was observed by scanning electron microscopy (SEM) of free surfaces specimens. The relative permittivity, dielectric dissipation, piezoelectric coefficient and electromechanical coupling factor reach at maximum value x = 0.49 (ε r = 7300.345 (at the Curie temperature), tanδ = 0.002050, d 31 = 94.965 PC/N and k p = 0.513 and a Curie temperature of 430˚C). These properties are very promising for applications in ultrasonic motors.

Applied Physics A, Dec 13, 2019

In the present study, (0.54 − x)Pb(Cr 1/5 ,Ni 1/5 ,Sb 3/5)O 3-0.46PbZrO 3-xPbTiO 3 ceramic powder... more In the present study, (0.54 − x)Pb(Cr 1/5 ,Ni 1/5 ,Sb 3/5)O 3-0.46PbZrO 3-xPbTiO 3 ceramic powders were synthesized by the conventional solid-state reaction process (where x = 0.42, 0.44, 0.46, 0.48 and 0.50). The obtained samples have been characterized using different techniques such as X-ray Diffraction (XRD) which reveals that the samples consist of a mixture of tetragonal and rhombohedral phases (morphotropic phase boundary MPB) in the range of 0.46 ≤ x ≤ 0.48, scanning electron microscopy (SEM) which shows an increase of the average grain size in the morphotropic phase boundary, dielectric measurements and Raman spectroscopy have been performed to get more insights into the effects of titanium dopant (Ti) content on the properties of PCNS-PZ-PT ceramics near the morphotropic phase boundary (MPB). It was found that the ceramic sintered at 1180 °C with Ti = 46% achieves excellent dielectric properties (ε r = 17,641.58, tan δ = 0.120 and T c = 576 K).

Copyright © 2013 Abdelhek Meklid et al. This is an open access article distributed under the Crea... more Copyright © 2013 Abdelhek Meklid et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Perovskite PZT variants were synthesized from stoichiometric oxide ratios of Pb, Zr, Ti, Cr, Ni and Sb. The oxide powders were mixed mechanically and calcinated, and then sintered to form the desired perovskite phase. The detailed structural and ferroelectric properties were carried out for sintered specimens. The results of X-ray diffraction showed that all the ceramics specimens have a perovskite phase. The multi-component ceramic system consists of the (0.80 − x)Pb(Cr1/5,Ni1/5,Sb3/5)O3-xPbTiO3-0.20PbZrO3 (PZT-CNS), with 0.30 ≤ x ≤ 0.42, and the ternary system near the rhombohedral/tetragonal morphotropic phase boundary(MPB) was investigated by X-ray diffraction and dielectric properties. In the present system, the MPB that coexis...

Copyright © 2013 Hayet Menasra et al. This is an open access article distributed under the Creati... more Copyright © 2013 Hayet Menasra et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Bismuth (Bi) and lanthanum (La) doped lead manganese antimoine zirconate titanate (PZMST) ceramic powders have been synthesized by high temperature solid-state reaction method. Preliminary X-ray structural analysis of the com-pounds shows the formation of tetragonal structure. Scanning electron micrographs (SEM) shows a uniform grain dis-tribution and grain size of the order of ~2.28 µm. Detailed dielectric studies of the Pb0.95(La1−z Biz)0.05[(Zr0.6Ti0.4)0.95(Mn1/3Sb2/3)0.05]O3 samples as a function of the temperature (from 25˚C to 450˚C) at frequency 1 kHz suggest that the compounds undergo a diffuse phase transition. The transition temperature shifts in-crease with increasing the Bi ratio. Diffusivity (γ) study of phase transition ...

Journal of Chemistry and Chemical Engineering, 2014

PMF-PZN-PZT (0.01Pb(Mo 1/3 Fe 2/3)O 3-xPb(Zn 1/3 Nb 2/3)O 3-(0.99-x)P(Zr 0.53 Ti 0.47)O 3 piezoel... more PMF-PZN-PZT (0.01Pb(Mo 1/3 Fe 2/3)O 3-xPb(Zn 1/3 Nb 2/3)O 3-(0.99-x)P(Zr 0.53 Ti 0.47)O 3 piezoelectric ceramics), where x = 0.00, 0.01, 0.03, 0.05 and 0.07 were prepared by a conventional mixed-oxide method. The results show that the pure peroveskit phase forms in these ceramics. X-ray diffraction analysis indicated that the phase of the material is a MPB (morphotropic phase boundary) structure. The effects of PZN content on the crystal structure and electrical properties were investigated. optimal dielectric properties were achieved at composition x = 0.07 ceramics by calcination at 800 °C and sintering at 1,180 °C, with a curie temperature of approximately 430 °C. These results clearly show the significance of PZN in controlling the electrical responses of the PMF-PZN-PZT system.

Journal of Fundamental and Applied Sciences, 2015

The main objective of this work is based on the synthesis and dielectric characterization of a ne... more The main objective of this work is based on the synthesis and dielectric characterization of a new material in ceramic PZT with a perovskite structure ABO3. We are interested to study the Quaternary system (doping in site A and site B) of general formula: Pb0.96Ba0.02Ca0.02[(Zr0.52Ti0.48)0.94(Zn1/3Ta2/3)0.03(In1/3Sb2/3)0.03]O3 short PZT-PBC-ZTIS. The sample selected for this study was prepared by the method of synthesis with solid way. Heat treatment was applied to these compositions at different temperatures: 1100, 1150,1180 and 1200 °C successively to optimize the sintering temperature optimal where the density of the sample is maximum (near theoretical density) and therefore the product has better physical quality. The study of dielectric properties of all samples showed a high permittivity dielectric εr = 18018, low dielectric loss: tgδ = 7.62%, for the composition sintered to 1180 ° C included in the phase morphotropique zone (FMP).

Materials Sciences and Applications, 2013

The purpose of this research is to study the effect of thermal conditions such as temperature ram... more The purpose of this research is to study the effect of thermal conditions such as temperature ramp rate and isothermal times in the phase formation of Pb(Zr 1−x Ti x)O 3 solid solutions with composition near the morphotropic phase boundary (MPB) by using the conventional ceramic method. The perovskite phase formation and morphology of undoped Pb(Zr 0.52 Ti 0.48)O 3 (abbreviated PZT) and doped new material Pb 0.98 Gd 0.02 [(Zr 0.52 Ti 0.48) 0.98 (Mg 1/3 Nb 2/3) 0.01 (Ni 1/3 Sb 2/3) 0.01 ]O 3 (abbreviated PZT-PGMNNS) specimens calcined between 700˚C and 900˚C have been examined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier Transform Infrared (FTIR) while the thermal evolution of the initial precursor was followed by TG-DTA. So the results of these studies have been discussed.

Materials Sciences and Applications, 2013

Perovskite PZT variants were synthesized from stoichiometric oxide ratios of Pb, Zr, Ti, Cr, Ni a... more Perovskite PZT variants were synthesized from stoichiometric oxide ratios of Pb, Zr, Ti, Cr, Ni and Sb. The oxide powders were mixed mechanically and calcinated, and then sintered to form the desired perovskite phase. The detailed structural and ferroelectric properties were carried out for sintered specimens. The results of X-ray diffraction showed that all the ceramics specimens have a perovskite phase. The multi-component ceramic system consists of the (0.80 − x)Pb(Cr 1/5 ,Ni 1/5 ,Sb 3/5)O 3-xPbTiO 3-0.20PbZrO 3 (PZT-CNS), with 0.30 ≤ x ≤ 0.42, and the ternary system near the rhombohedral/tetragonal morphotropic phase boundary(MPB) was investigated by X-ray diffraction and dielectric properties. In the present system, the MPB that coexists with the tetragonal and rhombohedral phases is a narrow composition region of x = 0.38-0.42. The scanning Electron Microscopy (SEM) showed an increase of the mean grain size when the sintering temperature was increased. A sintered density of 92.93% of the theoretical density was obtained for Ti = 42% after sintering at 1180˚C. Ceramics sintered at 1180˚C with Ti = 42% achieve excellent dielectric properties, which are as follows ε r = 4262.48, and Tc = 340˚C.

Synthetic Communications, 2005

ABSTRACT The synthesis of some new functionalized quinolyl derivatives relies on the 1,3-dipolar ... more ABSTRACT The synthesis of some new functionalized quinolyl derivatives relies on the 1,3-dipolar cycloaddition of an azomethine ylide, generated from sarcosine and paraformaldehyde, to quinolyl alpha,beta-unsaturated esters, followed by oxidation of the pyrrolidinyl moiety to pyrrole with activated MnO2 .

Materials Sciences and Applications, 2013

The structural and electrical properties of Pb[Zr x Ti 0.95−x (Mo 1/3 In 2/3) 0.05 ]O 3 piezoelec... more The structural and electrical properties of Pb[Zr x Ti 0.95−x (Mo 1/3 In 2/3) 0.05 ]O 3 piezoelectric ceramics system with the composition near the morphotropic phase boundary were investigated as a function of the Zr/Ti ratio. Studies were performed on the samples prepared by the conventional method of thermal synthesis of mixed oxides. The materials structure was investigated by X-ray diffractometry to demonstrate the coexistence of the tetragonal and rhombohedral phases. In the present system, the MPB, in which the tetragonal and rhombohedral phases coexist, is in a composition range of 0.47 ≤ x ≤ 0.50. The lattice constants of the a and c axes for the samples were calculated from the XRD patterns. Microstructure of the sintered ceramics was observed by scanning electron microscopy (SEM) of free surfaces specimens. The relative permittivity, dielectric dissipation, piezoelectric coefficient and electromechanical coupling factor reach at maximum value x = 0.49 (ε r = 7300.345 (at the Curie temperature), tanδ = 0.002050, d 31 = 94.965 PC/N and k p = 0.513 and a Curie temperature of 430˚C). These properties are very promising for applications in ultrasonic motors.

Applied Physics A, Dec 13, 2019

In the present study, (0.54 − x)Pb(Cr 1/5 ,Ni 1/5 ,Sb 3/5)O 3-0.46PbZrO 3-xPbTiO 3 ceramic powder... more In the present study, (0.54 − x)Pb(Cr 1/5 ,Ni 1/5 ,Sb 3/5)O 3-0.46PbZrO 3-xPbTiO 3 ceramic powders were synthesized by the conventional solid-state reaction process (where x = 0.42, 0.44, 0.46, 0.48 and 0.50). The obtained samples have been characterized using different techniques such as X-ray Diffraction (XRD) which reveals that the samples consist of a mixture of tetragonal and rhombohedral phases (morphotropic phase boundary MPB) in the range of 0.46 ≤ x ≤ 0.48, scanning electron microscopy (SEM) which shows an increase of the average grain size in the morphotropic phase boundary, dielectric measurements and Raman spectroscopy have been performed to get more insights into the effects of titanium dopant (Ti) content on the properties of PCNS-PZ-PT ceramics near the morphotropic phase boundary (MPB). It was found that the ceramic sintered at 1180 °C with Ti = 46% achieves excellent dielectric properties (ε r = 17,641.58, tan δ = 0.120 and T c = 576 K).

Copyright © 2013 Abdelhek Meklid et al. This is an open access article distributed under the Crea... more Copyright © 2013 Abdelhek Meklid et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Perovskite PZT variants were synthesized from stoichiometric oxide ratios of Pb, Zr, Ti, Cr, Ni and Sb. The oxide powders were mixed mechanically and calcinated, and then sintered to form the desired perovskite phase. The detailed structural and ferroelectric properties were carried out for sintered specimens. The results of X-ray diffraction showed that all the ceramics specimens have a perovskite phase. The multi-component ceramic system consists of the (0.80 − x)Pb(Cr1/5,Ni1/5,Sb3/5)O3-xPbTiO3-0.20PbZrO3 (PZT-CNS), with 0.30 ≤ x ≤ 0.42, and the ternary system near the rhombohedral/tetragonal morphotropic phase boundary(MPB) was investigated by X-ray diffraction and dielectric properties. In the present system, the MPB that coexis...

Copyright © 2013 Hayet Menasra et al. This is an open access article distributed under the Creati... more Copyright © 2013 Hayet Menasra et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Bismuth (Bi) and lanthanum (La) doped lead manganese antimoine zirconate titanate (PZMST) ceramic powders have been synthesized by high temperature solid-state reaction method. Preliminary X-ray structural analysis of the com-pounds shows the formation of tetragonal structure. Scanning electron micrographs (SEM) shows a uniform grain dis-tribution and grain size of the order of ~2.28 µm. Detailed dielectric studies of the Pb0.95(La1−z Biz)0.05[(Zr0.6Ti0.4)0.95(Mn1/3Sb2/3)0.05]O3 samples as a function of the temperature (from 25˚C to 450˚C) at frequency 1 kHz suggest that the compounds undergo a diffuse phase transition. The transition temperature shifts in-crease with increasing the Bi ratio. Diffusivity (γ) study of phase transition ...

Journal of Chemistry and Chemical Engineering, 2014

PMF-PZN-PZT (0.01Pb(Mo 1/3 Fe 2/3)O 3-xPb(Zn 1/3 Nb 2/3)O 3-(0.99-x)P(Zr 0.53 Ti 0.47)O 3 piezoel... more PMF-PZN-PZT (0.01Pb(Mo 1/3 Fe 2/3)O 3-xPb(Zn 1/3 Nb 2/3)O 3-(0.99-x)P(Zr 0.53 Ti 0.47)O 3 piezoelectric ceramics), where x = 0.00, 0.01, 0.03, 0.05 and 0.07 were prepared by a conventional mixed-oxide method. The results show that the pure peroveskit phase forms in these ceramics. X-ray diffraction analysis indicated that the phase of the material is a MPB (morphotropic phase boundary) structure. The effects of PZN content on the crystal structure and electrical properties were investigated. optimal dielectric properties were achieved at composition x = 0.07 ceramics by calcination at 800 °C and sintering at 1,180 °C, with a curie temperature of approximately 430 °C. These results clearly show the significance of PZN in controlling the electrical responses of the PMF-PZN-PZT system.

Journal of Fundamental and Applied Sciences, 2015

The main objective of this work is based on the synthesis and dielectric characterization of a ne... more The main objective of this work is based on the synthesis and dielectric characterization of a new material in ceramic PZT with a perovskite structure ABO3. We are interested to study the Quaternary system (doping in site A and site B) of general formula: Pb0.96Ba0.02Ca0.02[(Zr0.52Ti0.48)0.94(Zn1/3Ta2/3)0.03(In1/3Sb2/3)0.03]O3 short PZT-PBC-ZTIS. The sample selected for this study was prepared by the method of synthesis with solid way. Heat treatment was applied to these compositions at different temperatures: 1100, 1150,1180 and 1200 °C successively to optimize the sintering temperature optimal where the density of the sample is maximum (near theoretical density) and therefore the product has better physical quality. The study of dielectric properties of all samples showed a high permittivity dielectric εr = 18018, low dielectric loss: tgδ = 7.62%, for the composition sintered to 1180 ° C included in the phase morphotropique zone (FMP).

Materials Sciences and Applications, 2013

The purpose of this research is to study the effect of thermal conditions such as temperature ram... more The purpose of this research is to study the effect of thermal conditions such as temperature ramp rate and isothermal times in the phase formation of Pb(Zr 1−x Ti x)O 3 solid solutions with composition near the morphotropic phase boundary (MPB) by using the conventional ceramic method. The perovskite phase formation and morphology of undoped Pb(Zr 0.52 Ti 0.48)O 3 (abbreviated PZT) and doped new material Pb 0.98 Gd 0.02 [(Zr 0.52 Ti 0.48) 0.98 (Mg 1/3 Nb 2/3) 0.01 (Ni 1/3 Sb 2/3) 0.01 ]O 3 (abbreviated PZT-PGMNNS) specimens calcined between 700˚C and 900˚C have been examined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier Transform Infrared (FTIR) while the thermal evolution of the initial precursor was followed by TG-DTA. So the results of these studies have been discussed.

Materials Sciences and Applications, 2013

Perovskite PZT variants were synthesized from stoichiometric oxide ratios of Pb, Zr, Ti, Cr, Ni a... more Perovskite PZT variants were synthesized from stoichiometric oxide ratios of Pb, Zr, Ti, Cr, Ni and Sb. The oxide powders were mixed mechanically and calcinated, and then sintered to form the desired perovskite phase. The detailed structural and ferroelectric properties were carried out for sintered specimens. The results of X-ray diffraction showed that all the ceramics specimens have a perovskite phase. The multi-component ceramic system consists of the (0.80 − x)Pb(Cr 1/5 ,Ni 1/5 ,Sb 3/5)O 3-xPbTiO 3-0.20PbZrO 3 (PZT-CNS), with 0.30 ≤ x ≤ 0.42, and the ternary system near the rhombohedral/tetragonal morphotropic phase boundary(MPB) was investigated by X-ray diffraction and dielectric properties. In the present system, the MPB that coexists with the tetragonal and rhombohedral phases is a narrow composition region of x = 0.38-0.42. The scanning Electron Microscopy (SEM) showed an increase of the mean grain size when the sintering temperature was increased. A sintered density of 92.93% of the theoretical density was obtained for Ti = 42% after sintering at 1180˚C. Ceramics sintered at 1180˚C with Ti = 42% achieve excellent dielectric properties, which are as follows ε r = 4262.48, and Tc = 340˚C.

Synthetic Communications, 2005

ABSTRACT The synthesis of some new functionalized quinolyl derivatives relies on the 1,3-dipolar ... more ABSTRACT The synthesis of some new functionalized quinolyl derivatives relies on the 1,3-dipolar cycloaddition of an azomethine ylide, generated from sarcosine and paraformaldehyde, to quinolyl alpha,beta-unsaturated esters, followed by oxidation of the pyrrolidinyl moiety to pyrrole with activated MnO2 .