物理学报2011，Vol.60Issue(1)：670-675,6.
La诱导(Pb(1-3x/2)Lax)(Zr0.5Sn0.3Ti0.2)O3反铁电介电弛豫研究
Dielectric relaxation of(Pb(1-3x/2)Lax)(Zr0.5 Sn0.3 Ti0.2)O3 antiferroelectric ceramics induced by lanthanum doping
摘要
Abstract
The (Pb(1-3x/2） Lax ) ( Zr0.5 Sn0.3 Ti0.2 ) O3 ( PLZST, 0. 00 ≤ x ≤ 0. 18 ) antiferroelectric ceramics were prepared by traditional ceramic process. The effect of La modification on phase structures, phase transition, and electrical properties of PLZST ceramics were investigated by X-ray diffraction, P-E hysteresis loop and dielectric spectroscopy. With the increase of La content x, the samples at room temperature are rhombohedral ferroelectric phase (x ≤ 0. 0. 04 ), tetragonal antiferroelectric phase ( AFEt, 0. 06 ＜ x ≤ 0. 0. 08, and cubic phase ( PE'cx ≥ 0. 1 ), respectively. The dielectric spectroscopy shows that with the increase of La content x, AFE-PE phase transformation temperature decreases, and for samples with La content x exceeding 0. 12, strong dielectric frequency dispersion is observed around dielectric ε' and tanδ peaks. The peak temperatures Tm corresponding to the maxim dielectric constant shifts to higher temperatures with the increase of frequency, indicating that PLZST antiferroelectric transform to typical relaxors. The curves of dielectrics as functions of temperatures in the PLZST systems are fitted by a modified Curie - Weiss law proposed by Santos.关键词
反铁电陶瓷/介电频率色散/相变弥散/介电弛豫Key words
antiferroelectric ceramics/ dielectric frequency dispersion/ diffused phase transformation/ dieelctric relaxtion引用本文复制引用
刘鹏,张丹..La诱导(Pb(1-3x/2)Lax)(Zr0.5Sn0.3Ti0.2)O3反铁电介电弛豫研究[J].物理学报,2011,60(1):670-675,6.基金项目
国家自然科学基金(批准号:50572059)和教育部优秀青年教师资助计划(2003年)资助的课题. （批准号:50572059）
