HfFeMo2VO12的结构、相变及热膨胀性质研究  

Structure,Phase Transition and Thermal Expansion Properties of Hf FeMo2VO12

作　　者：梁二军[1] 徐鹏 陈冬霞 袁焕丽 郭娟[1] LIANG Erjun;XU Peng;CHEN Dongxia;YUAN Huanli;GUO Juan(School of Physics and Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Materials Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450015,China)

机构地区：[1]郑州大学物理工程学院,河南郑州450001 [2]郑州航空工业管理学院材料科学与工程学院,河南郑州450015

出　　处：《郑州大学学报（理学版）》2020年第1期99-105,共7页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家自然科学基金项目(11574276,11874328)

摘　　要：负热膨胀或近零膨胀材料在航天航空、精密器械和光学器件等领域具有重要应用前景。本文报道了一种分子式为HfFeMo2VO12的新型近零膨胀材料。研究结果表明,HfFeMo2VO12在低温下为单斜结构,在306 K以上转变为正交结构。膨胀仪测量其线热膨胀系数为αι=(-0.78±0.03)×10^-6 K^-1(398~750 K),而XRD测试其线膨胀系数为αι=(0.74±0.43)×10^-6 K^-1。其近零膨胀性质可归因于a轴的热膨胀和b、c轴的热收缩。拉曼光谱研究表明,其近零膨胀和负热膨胀的物理机制是Hf(Fe)-O-Mo(V)链中金属离子的平动和天平动,或桥氧原子的横向振动引起的体积收缩。Negative or near zero thermal expansion materials had important applications in aeronautics and fine mechanics and optical instruments.Herein a novel material with the formula HfFeMo2VO12 with near zero thermal expansion property was reported.It was shown that HfFeMo2VO12 adopted monoclinic structure at low temperatures and transformed to orthorhombic structure around 306 K.The linear coefficient of thermal expansion was measured by dilatometry to beαι=(-0.78±0.03)×10^-6 K^-1(398~750 K)and calculated by XRD to beαι=(0.74±0.43)×10^-6 K^-1(333~572 K).Its near zero thermal expansion property was ascribed to the thermal expansion in the a-axis and thermal contraction in the b-and c-axes.The origin of the negative or near zero thermal expansion was attributed to librational or translational vibrations of the connected polyhedra,or transverse vibrations of the bridging oxygen.

关 键 词：近零热膨胀 相变 拉曼光谱 

分 类 号：O414.13[理学—理论物理] O657.37[理学—物理]