Title of article :
Compositional dependence of cationic displacements in lithium niobate and lithium tantalate crystals
Original Research Article
Author/Authors :
Dongfeng Xue، نويسنده , , Kenji Kitamura، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
Cationic displacements in both lithium niobate (LN) and lithium tantalate (LT) crystals are quantitatively studied by using the measured crystallographic data and the bond valence model. On the basis of the structural analysis by the bond valence model, it is found that intrinsic defects in both LN and LT crystals lead to local contractions around View the MathML sourceNbLi4+/TaLi4+–□Li sites and the decrease of Nb5+/Ta5+–Li+ distances. Therefore, with the increasing Li concentration in both crystals Li+ and Nb5+/Ta5+ cations begin to leave each other. Cationic locations in the LN crystallographic frame at room temperature and high temperatures (up to those near the ferroelectric Curie temperature) are also studied, respectively, which strongly support our present conclusions.
Keywords :
Oxides , D. Crystal structure , Defects , A. Optical materials , Microstructure
Journal title :
Journal of Physics and Chemistry of Solids
Journal title :
Journal of Physics and Chemistry of Solids