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首页> 外文期刊>Inorganic materials >Polymorphism of Ferroelectric, Ferroelastic, Superionic Crystals K_3Nb_3B_2O_12 and K_3-xNa_xNb_3B_2O_12
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Polymorphism of Ferroelectric, Ferroelastic, Superionic Crystals K_3Nb_3B_2O_12 and K_3-xNa_xNb_3B_2O_12

机译：铁电，铁弹性，超离子晶体K_3Nb_3B_2O_12和K_3-xNa_xNb_3B_2O_12的多态性

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摘要

Data are presented on the phase transitions and physical properties of K_3Nb_3B_2O_12 (KNB) (KNB) and K_3-xNa_xNb_3B_2O_12 (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 deg. 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.
机译：呈现了有关K_3Nb_3B_2O_12（KNB）（KNB）和K_3-xNa_xNb_3B_2O_12（KNNB）晶体的相变和物理性质的数据。介电常数，非线性光学性质和电导率的详细测量，以及对畴结构的检查，表明KNB和KNNB表现出复杂的多态性：两者在100到900度之间都具有八个不同的多态性。 C.将Na引入KNB会提高转变温度，这使得研究室温下的低温相成为可能。高温相变是反铁电的，而其他相变具有铁电-铁弹性的性质。随着复杂的多态性，KNB和KNNB表现出超离子电导率。

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