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Model for the Ferroelectric Transition in Nonstoichiometric Lithium Niobate and Lithium Tantalate
Author(s) -
Birnie Dunbar P.
Publication year - 1991
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/j.1151-2916.1991.tb04332.x
Subject(s) - lithium tantalate , ferroelectricity , tantalate , materials science , lithium (medication) , phase transition , curie temperature , dielectric , condensed matter physics , stoichiometry , phase (matter) , lithium niobate , transformation (genetics) , chemistry , optoelectronics , physics , medicine , biochemistry , organic chemistry , ferromagnetism , gene , endocrinology
A model is developed for the ferroelectric‐to‐paraelectric phase transition in LiNbO 3 and LiTaO 3 . The model is consistent with literature reports of nonstoichiometry, point defect formation, and phase transformation behavior. The model uses lithium Frenkel‐defect‐based order‐disorder as the phase transformation mechanism. The phase transformation (Curie) temperature is predicted to decrease linearly with deviation from stoichiometry in agreement with experimental observations.