Mg-Doped Lithium Niobate : Some Comments on Stoichiometry, Structure and Properties
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概要
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The change in properties with composition of Mg-doped LiNbO_3 crystals at ∼10% MgO, reported by Hu et at. [Jpn. J. Appl. Phys. 30 (1991) 1412] may be reinterpreted in terms of a different change in solid solution mechanism to the one proposed by Hu et at. For Mg contents greater than ∼10%, phase diagram studies indicate that any crystals would be constrained to have compositions close to or on the stoichiometric join of constant overall cation content, with substitution mechanism 3Li^++ Nb^<5+>⥩4Mg^<2+> rather than to have A site vacancies as suggested by Hu et at. The Curie temperature, T_c, varies with composition. In addition to the well-established decrease in T_c associated with cation vacancy creation, a second mechanism must also operate to reduce T_c, probably associated with substitution of Mg onto B(Nb) sites.
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- 1992-05-15