锆钛锡酸铅镧驰豫反铁电单晶制备与场诱导相变机理研究

Rare-earth metal ion doped Pb1-x Lax (ZryTizSn1-y-z)O3 (PLZST) relaxor system, close to ferroelectric(FE)-antifferroelectric(AFE) morphologic boundary, were explored systematically. The influences of temperature, composition and flux on the structure, thermal stabilization and crystallization behavior of PLZST relaxor compound perovskites were discussed. Further researches on the mechanism of FE and AFE structural phase transitions in PLZST single crystals would improve the study, bulk single crystal growth techniques and applications of high performance relaxor compound perovskites materials in the future.

锆钛锡酸铅镧的电致伸缩率在已知陶瓷材料中是最高的。本课题旨在采用籽晶坩埚下降法，通过设计坩埚形状，筛选籽晶和助熔剂，调整比值，突破大尺寸、驰豫型反铁电PLZST单晶生长难题。研究PLZST体系中反铁电和铁电相稳定规律，弄清电场诱导相变与材料组荨⒂行蚪峁埂⒗胱尤蔽患熬迦∠蛑涞南嗷ス叵怠？馗咝阅艿缰律焖醪牧涎芯康男铝煊颉