STOICHIOMETRY ISSUES IN SINGLE-CRYSTAL LITHIUM TANTALATE

被引:63
作者
BORDUI, PF
NORWOOD, RG
BIRD, CD
CARELLA, JT
机构
[1] Crystal Technology Incorporated, Palo Alto, CA 94303
关键词
D O I
10.1063/1.359811
中图分类号
O59 [应用物理学];
学科分类号
摘要
Stoichiometry issues in lithium tantalate were studied through Czochralski growth of single crystals and vapor transport equilibration (VTE) of crystalline samples to specified Li/Ta compositions. Crystals were characterized through measurement of the ferroelectric Curie temperature T-c. The VTE experiments indicated a linear variation of T-c with Li/Ta ratio across the investigated range of 47.5-49.5 mol% Li2O. By control of initial melt stoichiometry, crystals representing melt fractions > 90% were grown having compositional uniformity within +/- 0.015 mol% Li2O. Growth of the compositionally uniform crystals was determined to take place through incongruent solidification, with lithium rejection from the growth interface compensating for Lithium volatilization from the melt surface. With the growth process applied, a melt composition of 48.39 mol% Li2O yielded grown crystals of a uniform 47.85 mol% Li2O solid composition. The lithium tantalate congruent composition was determined to lie at a value less than or equal to 47.70 mol% Li2O. (C) 1995 American Institute of Physics.
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页码:4647 / 4650
页数:4
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