The Dielectric, Piezoelectric and Pyroelectric Properties of (1-x)PST-xPZT Relaxor Ferroelectric Ceramics
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The Dielectric, Piezoelectric and Pyroelectric Properties of (1-x)PST-xPZT Relaxor Ferroelectric Ceramics 1 1 Dejun Lan , Qiang Chen , Yi Chen1, Zhuo Xu2, Yihang Jiang1, Xi Yue1, Dingquan Xiao1 and Jianguo Zhu1,* 1 College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China 2 Electronic Materials Research Laboratory, Xi’an Jiaotong University, Xi’an, 710049,China Abstract Pb(Sc1/2Ta1/2)O3 (PST) relaxor ferroelectric ceramics were investigated widely in the past decades for their excellent pyroelectric, ferroelectric and dielectric properties and comprehensive applications in uncooled focal plane arrays infrared detectors and other electronic devices. However, some other ferroelectrics could be added into the PST ceramics to form the complex perovskite ferroelectrics with better electric properties. In this paper, (1-x)PST-xPZT(PSTZT) relaxor ferroelectric ceramics were prepared by wolframite precursor process (named two-step -sintering method, TSSM). The experiment results showed that the PSTZT ceramics with pure perovskite structure could be prepared by using TSSM. The temperature dependence of permittivity and dielectric loss of PSTZT ceramics were investigated in detail, which indicated that PSTZT ceramics showed partly diffusive phase transition with little frequency dispersion. The dielectric and pyroelectric properties of PSTZT ceramics were also investigated and discussed. Keywords: PSTZT, relaxor ferroelectrics, diffusive phase transition INTRODUCTION Pb(Ta0.5Sc0.5)O3(PST) is a kind of complex perovskite relaxor ferroelectric ceramics and was investigated widely in the past decades. PST possesses high permittivity(≈25000) at room temperature, large electrostrictive effect, and good pyroelectricity(its peak coefficient high as to 230×10-8C/(cm2•K)) [1], and is one kind of potential key materials for uncooled focal plane arrays infrared detector. However, the Curie temperature of PST is between –5-25℃ and only sintered at about 1500℃ does compact PST ceramics with perovskite structure and good properties could be prepared, which limits the applications of PST ceramics. So, in order to promote properties of PST, much research has been done on the doping effects of PST. In the triple system of Pb(Sc0.5Ti0.5)O3-PbTiO3-PbZrO3(PST-PT-PZ), there is a morphotropic phase boundary (MPB) respectively in three binary systems: it is between 0.40-0.45mol%PT in PST-PT system [2]; near 52/48 of Zr/Ti in PT-PZ system [3]; between 0.7-0.8mol%PZ in PST-PZ system [4]. So PZT doping PST to form the complex triple ceramics could gain the better properties. Many investigators synthesized PST-based perovskite ceramics by using TSSM [5]. Though Liu Hong [6], etc., had prepared PST-based ceramics with pure perovskite phase by using ST+ZT as precursor, but the precursor ST was adopted in this research for simplicity. In this paper, (1-x)PST-xPZT(PSTZT) relaxor ferroelectric ceramics were prepared by wolframite precursor *Corresponding author: E-mail:[email protected];Tel/Fax:86-28-85412415/86
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