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无机材料学报

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Pb(Ni1/3Nb2/3)O3-PbTiO3系统准同型相界附近的介电异常

李振荣; 姚熹   

  1. 西安交通大学电子材料与器件研究所, 西安 710049
  • 收稿日期:1999-10-11 修回日期:1999-11-16 出版日期:2000-10-20 网络出版日期:2000-10-20

Abnormal Dielectric Characteristics in Ph(Ni1/3Nb2/3)O3-PbTiO3 System near Morphotropic Phase Boundary

LI Zhen-Rong; YAO Xi   

  1. Electronic Materials research Laboratory; Xi an Jiaotong University; Xi an 710049; China
  • Received:1999-10-11 Revised:1999-11-16 Published:2000-10-20 Online:2000-10-20

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摘要： 用两步合成法制备了（１－ｘ）Ｐｈ（Ｎｉ１／３Ｎｂ２／３）Ｏ３－ｘＰｂＴｉＯ３（ｘ＝０．３０～０．４０）陶瓷，对其相 结构和介电性能进行了研究．ＸＲＤ分析表明，准同型相界在ＰＴ含量ｘ＝０．３４～０．３８范围内． 介电性能研究结果表明；组成在准同型相界处的试样，其介电常数呈现最大值．同时还发现， 准同型相界处的陶瓷出现介电双峰，其中一个为弛豫型铁电相向顺电相转变的相变峰；另一个 介电峰处于１３０～１５０℃的高温区，可能是由镍离子变价、相结构变化等缺陷引起的松弛极化 产生的．

关键词: 铌镍酸铅, 准同型相界, 介电性能, 介电双峰, 松弛极化

Abstract: (1-x)PNN-xPT(x=0.30～0.40) ceramics were prepared by a two-steps synthesis method. Phase structure and dielectric properties were studied.
Morphotropic phase boundary exists in (1-x)PNN-xPT system at about x=0.34～0.38 composition range according to XRD analysis. Dielectric properties
measurments showed that the optimum value of dielectric constant was obtained and the phenomenon of dielectric dual peaks was found for composition near the
morphotropic phase boundary. One dielectric peak is phase transition peak from relaxor ferroelectric phase to paraelectric phase. The other peak lying in 130～150℃ temperature range results from relaxational polarization
of the valence change of Ni ion and kinds of defects in (1-x)PNN-xPT system.

Key words: lead nickle niobate, morphotropic phase boundary, dielectric properties, dielectric dual peaks, relaxational polarization

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