【摘要】 以PbO -PbF2 复合体系作为助熔剂 ,采用助熔剂自发成核缓冷法率先制备出成分为 (Pb0 .94La0 .0 4) (Zr0 .37Ti0 .1 8Sn0 .45 )O3的弛豫型复合钙钛矿结构锆钛锡酸铅镧 (PLZST)晶体 .合适的生长工艺为 :助熔剂中PbO与PbF2 的摩尔比为 0 .5 5∶0 .45 ,原料与助熔剂的摩尔比为 1∶1,保温温度 12 5 0℃ ,保温时间 12h ,快降温速率为 5 0～ 10 0℃ /h ,慢降温速率为 1～ 5℃ /h ,快速降温与慢速降温的转变温度为 115 0℃ .本工作对晶体及晶体生长余料中的组分进行了分析 .结果表明 :对一定组成的初始配料 ,PLZST晶体组成相对富La,Ti和Zr ,生长后的余料相对富Sn ;PLZST晶体中存在两种包裹体缺陷 ,晶体除包裹体处以外各元素分布均匀 ;生长余料中各元素分布较均匀 ,存在某些元素的相对富集区域更多还原

【Abstract】 The relaxor ferroelectric single crystals of lead lanthanum zirconate stannate titanate Pb 1- x La x (Zr y Ti z Sn 1- y-z )O 3 (abbreviated as PLZST, 0.01≤ x ≤0.05, 0.35≤ y ≤0.70, 0.05≤ z ≤0.20) with complex perovskite structure, were prepared with PbO-PbF 2 flux and slow cooling self_seeding technique. The suitable growth conditions found are PbO∶PbF2 =0.55∶0.45, raw material∶flux=1∶1, soaking temperature 1 250 ℃, soaking time 12 h, fast cooling rate C f 50～100 ℃/h, slow cooling rate C s 1～5 ℃/h, transition temperature between C f and C s 1 150 ℃. The results indicates that the PLZST crystals are rich in element La, Ti and Zr, while the remains are rich in element Sn. Two kinds of inclusion defects are involved and the elements are distributed evenly in the crystals except in the inclusion area. The results also suggests that the elements in the remains are distributed evenly but there are still some areas where some elements are richer.更多还原