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Structural and Relaxor Behavior of Pb0.95 （La1-xBix）0.05 [（Zr0.6Ti0.4）0.95（M n1/3S b2/3）0.05]O3 Ceramics

材料科学与工程（中英文A版） 2013年第9期3卷 615-620页

作者： Hayet Menasra zelikha necira Ahmed Boutarfaia Applied Chemistry Laboratory Exact and Natural and Life Sciences Faculty Materials Science Department Mohamed KheiderUniversity of Biskra BP I 45 7000 Algeria Exact and Natural and Life Sciences Faculty Materials Science Department University of Ouargla Ouargla 35000 Algeria

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Microstructure and Dielectric Properties of Bi Substituted PLZMST Ceramics

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Materials Sciences and Applications 2013年第5期4卷 293-298页

作者： Hayet Menasra zelikha necira Karima Bouneb Abdelhak Maklid Ahmed Boutarfaia Applied Chemistry Laboratory Exact and Natural and Life Sciences Faculty Materials Science Department Mohamed Kheider University of Biskra Biskra Algeria

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 compounds shows the formation of tetragonal structure. Scanning electron micrographs (SEM) shows a uniform grain distribution 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 increase with increasing the Bi ratio. Diffusivity (γ) study of phase transition of these compounds provided its value from 1.59 to 1.78 indicating the degree of the disordering in the system.

关键词： PLZT Ceramics Grain Size Dielectric Properties Diffusivity (γ)

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Effects of Thermal Conditions in the Phase Formation of Undoped and Doped Pb(Zr1-xTix)O3Solid Solutions

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Materials Sciences and Applications 2013年第5期4卷 319-323页

作者： zelikha necira Ahmed Boutarfaia Malika Abba Hayet Menasra Nora Abdessalem Laboratory of Applied Chemistry Department of Science Matter University of Biskra Biskra Algeria Laboratory of Applied Chemistry Department of Science Matter University of Biskra Biskra Algeria University of Ouargla Ouargla Algeria

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(Zr1-xTix)O3 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(Zr0.52Ti0.48)O3 (abbreviated PZT) and doped new material Pb0.98Gd0.02[(Zr0.52Ti0.48)0.98(Mg1/3Nb2/3)0.01(Ni1/3Sb2/3)0.01]O3 (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.

关键词： Pb(Zr1-xTix)O3 Morphotropic Phase Boundary Conventional Ceramic Method Perovskite Phase

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Synthesis and Dielectric Properties of (0.80 - x)Pb(Cr1/5,Ni1/5,Sb3/5)O3-xPbTiO3-0.20PbZrO3Ferroelectric Ceramics

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Materials Sciences and Applications 2013年第11期4卷 746-750页

作者： Abdelhek Meklid Ahmed Boutarfaia zelikha necira Hayet Menasra Malika Abba Laboratory of Applied Chemistry Materials Science Department Mohamed Kheider University of Biskra Biskra Algeria Laboratory of Applied Chemistry Materials Science Department Mohamed Kheider University of Biskra Biskra Algeria University of Ouargla Ouargla Algeria

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 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 εr = 4262.48, and Tc = 340°C.

关键词： PZT Calcination Dielectric Properties MPB Ceramic X-Ray Methods

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Investigation on the Microstructure and Electrical Properties of the Compositionally Modified PZT Ceramics Prepared by Mixed-Oxide Method

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Materials Sciences and Applications 2013年第11期4卷 723-729页

作者： Malika Abba Ahmed Boutarfaia zelikha necira Noura Abdessalem Hayet Menasra Abdelhek Meklid Laboratory of Applied Chemistry Department of Science Matter University of Biskra Biskra Algeria

The structural and electrical properties of Pb[ZrxTi0.95-x(Mo1/3In2/3)0.05]O3 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 co-existence 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 (εr = 7300.345 (at the Curie temperature), tanδ = 0.002050, d31 = 94.965 PC/N and kp = 0.513 and a Curie temperature of 430°C). These properties are very promising for applications in ultrasonic motors.

关键词： Morphotropic Phase Boundary Sintering Temperature Zr/Ti Ratio

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Perovskite Formation and Dielectric Responses in PZN Modified PMF-PZT Ceramics

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Journal of Chemistry and Chemical Engineering 2014年第3期8卷 250-253页

作者： Karima Bounab zelikha necira Hayet Menasra Sofiane Ameid Abdelhak Maklid Ahmed Boutarfaia Laboratory of Applied Chemistry Department of Science Matter University ofBiskra Biskra 07241 Algeria Laboratory of Semiconductor and Metal Department of Science Matter University of Biskra Biskra 07241 Algeria

PMF-PZN-PZT （0.01Pb（Mol/3Fe2/3）O3-xPb（Znl/3Nb2/3）O3-（O.99-x）P（Zro53Tio 47）03 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 ℃ and sintering at 1,180 ℃, with a curie temperature of approximately 430 ℃. These results clearly show the significance of PZN in controlling the electrical responses of the PMF-PZN-PZT system.

关键词： Perovskit dielectric properties MPB Curie temperature.

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