Abstract Amorphous films of Ag2Se were prepared by laser ablation. After being heated up to 270 °C, the films form oriented crystalline structure of orthorhombic β-modification upon further cooling at temperatures of 110 – 90 °С. The films undergo reversible β↔α phase transitions during the following temperature cycling, while the oriented crystalline structure stays the same. X-ray analysis showed no impurities reflections, excluding the one with very low intensity attributed to an elemental silver. The silver nanocrystals apparently form due to the selenium evaporation from the film surface during heating. The temperature dependence of the film's conductivity coincides with the one for bulk stoichiometric Ag2Se samples. It was shown that a considerable amount of α-Ag2Se is preserved in the film at room temperature even at low cooling rate. This phase is subjected to a significant mechanical stress caused by a density difference between α and β modifications. This circumstance points to the possibility of stabilization of high-temperature superionic modification of Ag2Se at room temperature in a nanolayered structure, in which some alternating layers create a similar stress on the Ag2Se layers.

中文翻译：

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在非晶膜结晶过程中，室温下高温 Ag2Se 相的稳定性。

摘要 采用激光烧蚀法制备了Ag2Se非晶薄膜。加热至 270 °C 后，薄膜在 110 – 90 °С 的温度下进一步冷却后形成正交 β-改性的定向晶体结构。在随后的温度循环过程中，薄膜经历了可逆的 β↔α 相变，而定向晶体结构保持不变。X 射线分析显示没有杂质反射，排除由于元素银而具有非常低强度的反射。银纳米晶体显然是由于加热过程中硒从薄膜表面蒸发而形成的。薄膜电导率的温度依赖性与大量化学计量的 Ag2Se 样品的温度依赖性一致。结果表明，即使在低冷却速率下，在室温下薄膜中仍保留有相当数量的 α-Ag2Se。该相受到由 α 和 β 变体之间的密度差异引起的显着机械应力。这种情况表明在室温下在纳米层结构中稳定 Ag2Se 的高温超离子改性的可能性，其中一些交替层在 Ag2Se 层上产生类似的应力。