Polymorphism of ferroelectric, ferroelastic, superionic crystals K3Nb3B2O12 and K3-xNaxNb3B2O12статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Data are presented on the phase transitions and physical properties of K3Nb3B2O12 (KNB) and K3-xNaxNb3B2O12 (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 degrees 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.