Model for the Ferroelectric Transition in Nonstoichiometric Lithium Niobate and Lithium Tantalate |
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| Authors: | Dunbar P Birnie III |
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| Affiliation: | Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721 |
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| Abstract: | 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. |
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| Keywords: | models ferroelectrics transitions lithium niobate tantalates |
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