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- Title
Phase Transitions and Ferroelectric and Superionic Properties of K<sub>3</sub>Nb<sub>3</sub>B<sub>2</sub>O<sub>12</sub>–K<sub>3</sub>Nb<sub>3</sub>Si<sub>2</sub>O<sub>13</sub> Single Crystals.
- Authors
Kharitonova, E. P.; Voronkova, V. I.; Yanovskii, V. K.
- Abstract
Data are presented on K3Nb3O6(B2O6)1-x( Si2O7)x solid solutions in the K3Nb3B2O12-K3Nb3 Si2O13 system. The system is shown to contain two partial solid-solution series in the composition ranges 0 < × < 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 ε33 of K3Nb3Si2O13 crystals is as high as 4000.
- Subjects
POTASSIUM compounds; PHASE transitions; FERROELECTRICITY; INDUSTRIAL chemistry; INORGANIC chemistry
- Publication
Inorganic Materials, 2003, Vol 39, Issue 2, p127
- ISSN
0020-1685
- Publication type
Article
- DOI
10.1023/A:1022190411905