机构地区: 清华大学理学院化学系
出 处: 《中国有色金属学报》 2005年第11期1806-1810,共5页
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。 Lead lanthanum zirconate titanate stannate (PLZST) perovskite single crystal with size of 2 mm× 2 min× 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.