差示扫描量热法
拉曼光谱
相变
材料科学
相(物质)
大气温度范围
拉曼散射
扫描电子显微镜
结晶学
声子
分析化学(期刊)
化学
凝聚态物理
光学
热力学
物理
有机化学
色谱法
复合材料
作者
João Victor Barbosa Moura,C.D. de Abreu Lima,Edilainea Alves Oliveira Melo,Valéria Ermes Santos,W.C. Ferreira,Paulo Freire,C. Luz-Lima
标识
DOI:10.1016/j.saa.2020.119339
摘要
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.
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