Model for the Ferroelectric Transition in Nonstoichiometric Lithium Niobate and Lithium Tantalate

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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.

Original languageEnglish
Pages (from-to)988-993
Number of pages6
JournalJournal of the American Ceramic Society
Volume74
Issue number5
DOIs
Publication statusPublished - 1991

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Lithium
Ferroelectric materials
Phase transitions
Point defects
Curie temperature
Stoichiometry
lithium niobate

Keywords

  • ferroelectrics
  • lithium niobate
  • models
  • tantalates
  • transitions

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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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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AB - 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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KW - tantalates

KW - transitions

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