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Curie Temperature of Non-Stoichiometric Ni-Doped Lithium Tantalate

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Author(s): Kamal Maaider | Adib Jennane | Noureddine Masaif | Abdelghani Khalil

Journal: Journal of Modern Physics
ISSN 2153-1196

Volume: 02;
Issue: 09;
Start page: 1093;
Date: 2011;
Original page

Keywords: Lattice Defect Structure | Vacancy Model | Ni:LiTaO3 | Curie Temperature

ABSTRACT
Ceramics of Li0.98?xTa1.004?x/5O3 solid solutions with 0 ≤ x ≤ 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 LiTaO3 crystal is discussed. So, the mechanism of phase transition due to thermal expansion of crystal is described.

Tango Jona
Tangokurs Rapperswil-Jona

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