Determination of the lithium Frenkel energy in lithium tantalate

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Abstract

The ferroelectric to paraelectric phase transition is modeled as an order-disorder process with lithium atoms jumping between their normal sites and adjacent interstitial sites. This lithium jump corresponds to lithium Frenkel defect formation. At temperatures significantly away from the Curie temperature it is found that the lithium Frenkel energy is about 0.165 eV. As the temperature approaches Tc, disorder abounds and eventually the lithiums become equally distributed between the two available sites. The previously reported spontaneous polarization, Ps, data for lithium tantalate are analyzed in terms of this order-disorder model. The slope of P2 s with temperature is directly in line with the model's prediction.

Original languageEnglish
Pages (from-to)2485-2488
Number of pages4
JournalJournal of Applied Physics
Volume69
Issue number4
DOIs
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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