Polymorphism of Ferroelectric, Ferroelastic, Superionic Crystals K3Nb3B2O12 and K3– x Na x Nb3B2O12
Source abstract
Abstract
Data are presented on the phase transitions and physical properties of K3Nb3B2O12 (KNB) and K3 – хNaxNb3B2O12 (KNNB) crystals. Detailed measurements of the dielectric permittivity, nonlinear optical properties, and electrical conductivity, as well as examination of the domain structure, demonstrate that KNB and KNNB exhibit a complex polymorphism: both have eight different polymorphs between –100 and 900°C. The introduction of Na into KNB raises the transition temperatures, which makes it possible to investigate the low-temperature phases at room temperature. The high-temperature phase transition is antiferroelectric, whereas the other transitions are of a ferroelectric–ferroelastic nature. Along with complex polymorphism, KNB and KNNB exhibit superionic conductivity.
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Research context
OpenAlex topics: Crystal Structures and Properties · Solid-state spectroscopy and crystallography · Photorefractive and Nonlinear Optics
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References (12)
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