Phase transitions and dielectric properties of perovskite-type oxyfluorides (1-x)KNbO3-xKMgF3
Phase transitions and dielectric properties of perovskite-type oxyfluorides (1-x)KNbO3-xKMgF3
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DOI：
10.1016/j.jfluchem.2018.02.010
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发表时间：
2018-05
影响因子：
1.9
通讯作者：
T. Katsumata;N. Sawada;Ryosuke Kuraya;Takuma Hamagaki;A. Aimi;Daisuke Mori;Y. Inaguma;Ruing Ping Wang
中科院分区：
文献类型：
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作者：
T. Katsumata;N. Sawada;Ryosuke Kuraya;Takuma Hamagaki;A. Aimi;Daisuke Mori;Y. Inaguma;Ruing Ping Wang
(1-x)KNbO3-xKMgF3was synthesized using a sealed silica tube with an oxygen generator (KNMOF-O2) or a high-pressure and high-temperature apparatus (KNMOF-hp). The variations in phase transition temperature and dielectric properties were investigated. The temperatures of a tetragonal-to-cubic phase transition and an orthorhombic-to-tetragonal phase transition decreased withx, whereas the temperature of a rhombohedral-to-orthorhombic phase transition increased with it. The temperature variation, however, became constant forx≥ 0.05 and did not merge into one. In the temperature dependence of dielectric permittivity forx= 0.05 (KNMOF-hp), a broad maximum was observed in the vicinity of 400 K and its value reached approximately 2200 which is higher than that of a KNbO3dense ceramic. Considering the variation of phase transition temperatures and dielectric measurements, it is concluded that the relaxor-like behavior was realized forx= 0.05 (KNMOF-hp).
