In this work, we present the study of the temperature-dependent behavior of silver orthophosphate (Ag₃PO₄) microcrystals using in situ Raman scattering. The Ag₃PO₄ as-synthesized microcrystals were prepared by the precipitation method and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman and infrared spectroscopy, and differential scanning calorimetry (DSC). Temperature-dependent phonon dynamics were performed on Ag₃PO₄ microcrystals and pointed to a first-order phase transition in the temperature range 500–515 °C: Phase I (25–500 °C) → Phase II (515–590 °C). The phase transition is reversible and a temperature hysteresis was observed during the heating – cooling process: Phase II (590–470 °C) → Phase I (455–25 °C). The reversible phase transition is related to the distortion of the tetrahedral symmetry of PO₄ caused by the decrease in the crystalline order. DSC analysis confirmed the results of temperature-dependent Raman spectroscopy.

在这项工作中，我们目前使用原位拉曼散射对正磷酸银（Ag ₃ PO ₄）微晶的温度依赖性行为进行研究。通过沉淀法制备了Ag ₃ PO ₄初生微晶，并通过粉末X射线衍射（XRD），扫描电子显微镜（SEM），拉曼光谱和红外光谱以及差示扫描量热法（DSC）进行了表征。在Ag ₃ PO ₄上进行了随温度变化的声子动力学微晶，并指出在500–515°C的温度范围内发生一阶相变：I相（25–500°C）→II相（515–590°C）。相变是可逆的，并且在加热–冷却过程中观察到温度滞后：第二阶段（590–470°C）→第一阶段（455–25°C）。可逆相变与由结晶顺序的减少引起的PO ₄的四面体对称性的变形有关。DSC分析证实了温度依赖性拉曼光谱的结果。