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Curie Temperature of Non-Stoichiometric Ni-Doped Lithium Tantalate
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Journal of Modern Physics·Volume 02 (2011)·Pages 1093–1097·Published 19 September 2011·DOI10.4236/jmp.2011.29134
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Abstract
Ceramics of Li<sub>0.98?<i>x</i></sub>Ta<sub>1.004?<i>x</i>/5</sub>O<sub>3</sub> solid solutions with 0 ≤<i> x</i> ≤ 0.20 are studied by a new theoretical approach. From the experience, we have proposed the new vacancy models which are able to describe substitutional mechanism in Ni-doped lithium tantalate. Calculations of the Curie temperature in Ni-doped non stoichiometric lithium tantalate reveal good correspondence with experimental results. The substitution mechanism of the doped compositions Ni in LiTaO<i>3</i> crystal is discussed. So, the mechanism of phase transition due to thermal expansion of crystal is described.
KeywordsLattice Defect StructureVacancy ModelNi:LiTaO<sub>3</sub>Curie Temperature
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