原位Raman光谱技术在NaVO_(2)F_(2)相变研究中的应用  

Application of In-situ Raman Spectroscopy on NaVO_(2)F_(2) Phase Transformation Study

作　　者：张飒[1,2] 郑腾飞 韩龙飞 杨存旭 ZHANG Sa;ZHENG Tengfei;HAN Longfei;YANG Cunxu(College of Materials,Xiamen University,Xiamen 361005,China;Fujian Provincial Key Laboratory of Advanced Materials,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学材料学院,厦门361005 [2]厦门大学福建省特种先进材料重点实验室,厦门361005

出　　处：《机械工程材料》2021年第4期25-28,共4页Materials For Mechanical Engineering

摘　　要：采用水热法合成NaVO_(2)F_(2)化合物,通过X射线衍射分析NaVO_(2)F_(2)的晶体结构,并通过Raman光谱技术获得从73K至573K升温过程中NaVO_(2)F_(2)的原位Raman光谱,对特征峰随温度的变化进行分析,得到NaVO_(2)F_(2)的相变行为。结果表明:获得的NaVO_(2)F_(2)晶体在室温下是单斜晶系,空间群P21/c;在升温过程中,在93,233,453K温度点附近分别发生了低温一阶相变、低温相到P2_(1)/c相的转变以及P21/c相到P2_(1)/m相的转变,与非原位测试方法得到的结论相吻合,说明通过原位Raman光谱技术研究NaVO_(2)F_(2)的相变行为是可行的。The NaVO_(2)F_(2) compound was synthesized by hydrothermal method.The crystal structure of NaVO_(2)F_(2) was analyzed by X-ray diffraction.In-situ Raman spectra of NaVO_(2)F_(2) during the heating from 73 K to573 K was obtained by Raman spectroscopy.The changes of characteristic peaks with temperature was analyzed and the phase transformation behavior was obtained.The results show that the obtained NaVO_(2)F_(2) crystal was monoclinic at room temperature with space group P21/c.During the heating process,the low-temperature firstorder phase transformation,transformation from low-temperature phase to P2_(1)/c phase and transformation from P21/c phase to P2_(1)/m phase occurred at the temperature point of 93,233,453 K,respectively.The results were in good agreement with those obtained by non-in-situ testing method,indicating that the in-situ Raman spectroscopy could be used to study the phase transformation behavior of NaVO_(2)F_(2).

关 键 词：NaVO2F2单晶 相变 原位Raman光谱 

分 类 号：TB39[一般工业技术—材料科学与工程]