Phase transitions and ferroelectric and superionic properties of K3Nb3B2O12-K3Nb3Si2O13 single crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Data are presented on K3Nb3O6(B2O6)(1-x)(Si2O7)(x) solid solutions in the K3Nb3B2O12-K3Nb3Si2O13 system. The system is shown to contain two partial solid-solution series in the composition ranges 0 < x < 0.2 (KNB:Si) and 0.8 < x < 1 (KNS:B). KNB:Si crystals are grown from off-stoichiometric melts, and their polymorphism and physical properties are studied. Similar to K3Nb3B2O12, KNB:Si crystals exhibit a complex polymorphism and combine ferroelectric, ferroelastic, and superionic properties. Si substitution for B is shown to have a significant effect on the phase-transition temperatures and electrical properties of K3Nb3B2O12 crystals. The results obtained for K3Nb3Si2O13 crystals demonstrate that, in spite of their hexagonal habit, their room-temperature structure possesses orthorhombic or lower symmetry. The room-temperature dielectric permittivity epsilon(33) of K3Nb3Si2O13 crystals is as high as 4000.