Notable Influence of Orthorhombic-Tetragonal Phase Transition on Microwave Dielectric Dispersion in BaTiO3 Ceramic

ZHANG Jialiang; HAO Wentao; ZHENG Peng; TAN Yongqiang; JI Pengfei; WANG Chunlei

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Notable Influence of Orthorhombic-Tetragonal Phase Transition on Microwave Dielectric Dispersion in BaTiO3 Ceramic

ZHANG Jialiang 1 * #,HAO Wentao 2,ZHENG Peng 2,TAN Yongqiang 2,JI Pengfei 2,WANG Chunlei 2

1.School of physics, State Key Laboratory of Crystal Materials, Shandong University, JiNan 250100

2.School of physics, State Key Laboratory of Crystal Materials, Shandong University

*Correspondence author

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Funding: the Doctoral Program of Higher Education （No.Grant No. 20090131110015）, the Natural Science Foundation of Shandong Province （No.Grant No. ZR2010EM00）, the National Natural Science Foundation of China （No.Grant No. 51172128）

Opened online:23 November 2012

Accepted by: none

Citation: ZHANG Jialiang,HAO Wentao,ZHENG Peng.Notable Influence of Orthorhombic-Tetragonal Phase Transition on Microwave Dielectric Dispersion in BaTiO3 Ceramic[OL]. [23 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4496187

Temperature-stable, frequency-independent and low-loss dielectric properties are usually essential for a high-permittivity ferroelectric material to be practically applied in microwave devices. BaTiO3 ceramics are a type of important ferroelectric material in the viewpoints of both fundamental studies and technological applications. However, investigations of the microwave dielectric dispersion below room temperature have been rarely carried out so far. In this study, the temperature evolution of dielectric dispersion was examined for a coarse-grained BaTiO3 ceramic in the frequency range from 40 Hz to 1 GHz and over the temperature interval between -50 and 180 C, which thus includes the orthorhombic-tetragonal polymorphic phase transition and covers the large part of common usage temperature region. An important physical phenomenon that the phase transition has a notable influence on the microwave dielectric dispersion has been clearly disclosed. The dielectric permittivity ε' shows a maximum whereas the characteristic frequency fr exhibits a minimum in the vicinity of orthorhombic-tetragonal phase transition temperature. In addition, large difference in fr is observed between the heating process and the cooling process in the tetragonal phase. It is considered that the experimentally found phenomenon can be explained by the previously suggested mechanism of the emission of elastic shear waves from ferroelastic domain walls.

Keywords:BaTiO3 ceramic; Orthorhombic-tetragonal phase transition; Microwave dielectric dispersion; Domain walls

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