High-temperature phase transitions in SrHfO3
High-temperature phase transitions in SrHfO3
复制标题
DOI：
10.1103/physrevb.60.2972
复制
发表时间：
1999-08-01
影响因子：
3.7
通讯作者：
Chakoumakos, BC
中科院分区：
文献类型：
--
作者：
Kennedy, BJ;Howard, CJ;Chakoumakos, BC
采用粉末中子衍射和Rietveld方法研究了高温下SrHfO 3的晶体结构。从300 K到约670 K，SrHfO 3的结构是正交的（Pnma）。到870 K，材料采用第二正交结构（Cmcm）。然后，材料经历进一步的相变，并且从类似于1000至1353 K为四重态（I4/mcm）。在较高温度（>1360 K）下，结构是理想的立方钙钛矿（Pm（3）/bar m）。以氧八面体在四面体相中的旋转角作为序参量，其温度变化符合二级相变。[S0163-1829（99）06229-3]。
The crystal structure of SrHfO3 has been studied at high temperatures using powder neutron diffraction and the Rietveld method. From 300 K to approximately 670 K the structure of SrHfO3 is orthorhombic (Pnma). By 870 K the material adopts a second orthorhombic structure (Cmcm). The material then undergoes a further phase transition and is tetragonal (I4/mcm) from similar to 1000 to 1353 K. At higher temperatures (>1360 K) the structure is the ideal cubic perovskite (Pm (3) over bar m). The angle of rotation of the oxygen octahedron in the tetragonal phase is taken as the order parameter and its temperature variation is consistent with a second order phase transition. [S0163-1829(99)06229-3].