(清华大学 化学系， 北京100084)
摘 要: 采用复合助熔剂技术， 生长了完整、 尺寸为2 mm×2 mm×2 mm的锆钛锡酸铅镧 (简称PLZST)单晶。 X射线衍射分析结果表明： 晶体属四方晶系结构, 晶格常数为: a=b=4.062 nm， c=4.106 nm。 Raman光谱分析确定了PLZST单晶的结构相变温度为175 ℃， 且其顺电-反铁电相变为可逆相变， 具有弛豫特性。 通过高分辨透射电镜(HRTEM)分析了晶体的微观结构， 讨论了PLZST单晶的弛豫相变规律和相变行为。
关键字: 锆钛锡酸铅镧； 驰豫反铁电单晶； 结构相变
（ Department of Chemistry, Tsinghua University, Beijing 100084, China）
Abstract: Lead lanthanum zirconate titanate stannate (PLZST) perovskite single crystal with size of 2 mm×2 mm×2 mm was grown by a flux method. X-ray diffraction analysis shows that the single crystal is tetragonal system and crystal parameters obtained are a=b=4.062 nm and c=4.106 nm. The phase-transformation temperature from tetragonal system to cubic system is 175℃ measured by Raman spectrum and the transition is reversal. The mechanism of this phase transition was explained based on the HRTEM analysis.
Key words: PLZST; relaxor antiferroelectric single crystal; structural phase transition
