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Phase transitions in the (NH_4)_2NbOF_5 oxyfluoride

机译:(NH_4)_2NbOF_5氟氧化物中的相变

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摘要

The thermal and dielectric properties of the (NH_4)_2NbOF_5 oxyfluoride have been investigated. It has been established that the structural phase transitions Cmc2_1 → C2 → Ia observed at the temperatures T_1 = 258.0 K and T_2 = 218.9 K exhibit a nonferroelectric nature. The hydrostatic pressure, which stabilizes the initial phase and destabilizes the low-temperature phase, hardly affects the temperature range of stability of the intermediate phase. The model of sequential ordering of the structural elements due to phase transitions has been analyzed using experimental data on the entropies of the phase transitions.
机译:研究了(NH_4)_2NbOF_5氟氧化物的热和介电性能。已确定在温度T_1 = 258.0 K和T_2 = 218.9 K时观察到的结构相变Cmc2_1→C2→Ia表现出非铁电性质。稳定初始相并使低温相不稳定的静水压力几乎不影响中间相的稳定温度范围。已经使用关于相变熵的实验数据分析了由于相变而导致结构元素的顺序排序模型。

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