Defect structure analysis of lithium niobate single crystals and lithium tantalate ceramics with the next-nearest-neighbor interactions

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• 作者：M. Tahiri (1) tahisimo@yahoo.fr
  N. Masaif (12)
  A. Jennane (13)
• 关键词：Defect structure &#8211 ; Phase transition &#8211 ; Next nearest neighbor &#8211 ; LN crystals &#8211 ; LT ceramics &#8211 ; Curie temperature
• 刊名：Indian Journal of Physics
• 出版年：2012
• 出版时间：July 2012
• 年：2012
• 卷：86
• 期：7
• 页码：595-600
• 全文大小：345.5 KB
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• 作者单位：1. Laboratoire Rayonnement & Mati猫re-Equipe de Recherche Physique de la Mati猫re et Mod茅lisation-D茅partement de Physique, Facult茅 des Sciences et Techniques, BP 577 Settat, Morocco2. D茅partement de Physique Facult茅 des Sciences, Kenitra, Morocco3. Ecole Nationale des Sciences Appliqu茅es, Universit茅 Hassan, 1er BP 77, Khouribga, Morocco
• ISSN：0974-9845

文摘

In this work, we have proposed a theoretical description of the defect structure in LiTaO₃ and LiNbO₃ on the basis of vacancy models combined with a ferroelectric phase transition theory. The calculated values by our approach, which takes into account the next-nearest neighbors interactions, are closer to the experimental data and improves the theoretical approach of Safaryan. A comparative study between the calculated and measured values of the Curie temperature shows that the lithium vacancy model is the best model that has been suggested for describing the defect structure in nonstoichiometric lithium niobate single crystals and lithium tantalate ceramics.