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Pb(Yb1/2Nb1/2)O3-PbHfO3-PbTiO3Ceramics Preparation and Electrical Properties

Author: LiuXing
Tutor: YangBin
School: Harbin Institute of Technology
Course: Condensed Matter Physics
Keywords: Piezoelectric ceramic high Curie temperature Electrical Properties Morphotropic Phase Boundary
CLC: TQ174.1
Type: Master's thesis
Year: 2013
Downloads: 25
Quote: 0
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Abstract


Ferroelectric ceramic material with good dielectric and piezoelectricproperties, especially with high Curie temperature of the ceramic material, has beenwidely used in many fields, and conducted a lot of research. Lead-basedpiezoelectric ceramics with some unmatched performance cha racteristics has highresearch and application value, though Lead-based piezoelectric ceramics is harmfulto the environment.PZT piezoelectric ceramic material is currently the most widely used in theindustrial application of piezoelectric material and also more extensive studied.Compared to PZT, The Curie temperature of PT relaxor ferroelectric is high,generally490℃, and its electromechanical coupling coefficient and piezoelectriccoefficient is higher.Hf and Zr belong to the same main group, Hf4+ions with Zr4+ionic radiusdifference is small, though Hf4+ions with Zr4+ion mass varies widely, so their Ionicpolarization are similar. Studied found that PHT ceramics with good electricalproperties. Currently PYN-PT ceramics are researched a lot. The ceramic system hasa high Curie temperature(360℃), but the ceramic system phase boundary is narrow,it is hardly to preparat.This paper researched the ternary piezoelectric ceramics Pb(Yb1/2Nb1/2)O3-PbHfO3-PbTiO3.We preliminary analysised and selected a different preparation processfor preparing. Compared and Choosed a suitable sample preparation methods.Prepared under different conditions for analyzing the performance of the sample andfurther optimize the preparation conditions to get high quality ceramics finally.Prepared the different compositions of the ceramic sample under suitable conditionsin determining. Tested and analysised the prepared a series of samples, we initiallyidentified the Morphotropic Phase Boundary.This paper also tested the electrical properties of samples, then analyzedmaximum polarization, remnant polarization and coercive fie ld variation withcomposition. Test its temperature dielectric spectroscopy to determine the Curietemperature and the variation with composition, according the Ferroelectricproperties to further determine the Morphotropic Phase Boundary. Explored thepolarization condition of samples under appropriate condition for polarizationtreatment. Tested piezoelectric coefficient d33, electrical properties of conventionalelectromechanical coupling factor kpand mechanical quality factor Qm, Ultimatelydetermine the system of the Morphotropic Phase Boundary.We can find by a series of tests, The system ceramic material has high Curie temperature, the Curie temperature close to400℃, and good electrical properties.

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