The temperature dependences of the linear dielectric permittivity ε′ and the third harmonic coefficient γ_3ω for nanocomposites obtained by embedding a KNO₃ melt into the pores of Al₂O₃ oxide films with diameters of 330, 190, and 100 nm are investigated. The measurements were carried out in the heating and cooling modes in the range from room temperature to 463 K. It was found that the structural phase transition from phase II to phase I of potassium nitrate in Al₂O₃ films shifts towards higher temperatures as compared to bulk KNO₃. For KNO₃, the ferroelectric phase appears in the pores of 190 and 100 nm both upon heating and upon cooling.

研究了通过将 KNO ₃熔体嵌入直径为 330、190 和 100 nm的 Al ₂ O ₃氧化物膜的孔中获得的纳米复合材料的线性介电常数 ε' 和三次谐波系数 γ _3ω的温度依赖性。测量是在室温至 463 K 范围内的加热和冷却模式下进行的。发现 Al ₂ O ₃薄膜中硝酸钾从相 II 到 I 相的结构相变向更高的温度移动。散装 KNO ₃。对于 KNO ₃，在加热和冷却时，铁电相都出现在 190 和 100 nm 的孔中。