A model is developed for the ferroelectric‐to‐paraelectric phase transition in LiNbO3 and LiTaO3. 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.
|Number of pages||6|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1991|
- lithium niobate
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry