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Growth of noncongruent LiTaO 3 crystal by chemical vapor phase equilibration using niobium‐based two‐phase powder
Author(s) -
Zhang ChaoYang,
Yang XiaoFei,
Zhang ZiBo,
Wong WingHan,
Pun Edwin YueBun,
Zhang DeLong
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15913
Subject(s) - lithium (medication) , stoichiometry , lithium tantalate , crystal (programming language) , gravimetric analysis , phase (matter) , lithium oxide , materials science , niobium , oxide , analytical chemistry (journal) , niobium oxide , lithium niobate , inorganic chemistry , chemistry , mineralogy , lithium vanadium phosphate battery , metallurgy , organic chemistry , electrochemistry , optoelectronics , medicine , electrode , computer science , programming language , endocrinology
Noncongruent nearly stoichiometric/lithium‐deficient LiTaO 3 crystal was grown by lithium‐rich/lithium‐deficient chemical vapor‐phase‐equilibration ( VPE ) technique, and low‐cost two‐phase powder LiNbO 3 ‐Li 3 NbO 4 or LiNbO 3 ‐LiNb 3 O 8 instead of expensive LiTaO 3 ‐Li 3 TaO 4 or LiTaO 3 ‐LiTa 3 O 8 was used in the VPE experiments. The LiTaO 3 crystalline phase in the lithium‐rich/lithium‐deficient crystal was confirmed by X‐ray analysis. The lithium‐rich/lithium‐deficient VPE ‐induced lithium‐oxide (Li 2 O) molar content increase/reduction was measured as a function of VPE duration using gravimetric method, and empirical relations between them are presented for both cases. We show that both the lithium‐rich and lithium‐deficient VPE techniques based on the two‐phase powder LiNbO 3 ‐Li 3 NbO 4 or LiNbO 3 ‐LiNb 3 O 8 can be successfully used to adjust the lithium‐oxide content in a LiTaO 3 crystal and produce a noncongruent nearly stoichiometric or lithium‐deficient crystal plate with desired lithium‐oxide content.