Structural phase transition in cobalt oxyfluoride Co3Sb4O6F6 observed by high-resolution synchrotron and neutron diffraction
Structural phase transition in cobalt oxyfluoride Co3Sb4O6F6 observed by high-resolution synchrotron and neutron diffraction
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通过高分辨率同步加速器和中子衍射观察到氟氧化钴 Co3Sb4O6F6 的结构相变
DOI：
10.1016/j.jpcs.2021.110568
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发表时间：
2021
影响因子：
4
通讯作者：
Y. Kubota
中科院分区：
文献类型：
--
作者：
S. Shimono;H. Ishibashi;Y. Nagayoshi;H. Ikeno;S. Kawaguchi;M. Hagihala;S. Torii;T. Kamiyama;K. Ichihashi;S. Nishihara;K. Inoue;Y. Ishii;Y. Kubota
用高分辨中子衍射和同步辐射粉末衍射方法观察到非中心对称氟氧化物Co 3 Sb 4 O 6 F6在T S = 180 K时发生了由立方相（I4 <$3m）到立方相（I4 <$3m）的结构转变。此外，比热，磁化强度和介电测量进行调查这一相变。虽然比热和介电常数在Ts处显示出异常，但在低至30 K的极化滞后回线中没有观察到向铁电相的转变。此外，使用中子粉末衍射数据的磁结构分析揭示了从顺磁相到G-型反铁磁相的转变在T N = 67 K，在这一点上，在比热测量中也观察到一个峰值。Co2+的磁矩沿着四面体c轴取向，13 K时的磁矩为2.80（1）μ B.结构分析表明，在T_S处，F原子的大位移导致了CoO_2 F_4八面体的旋转和变形，这在Co 3 Sb_4 O_6 F_6的结构相变中起着重要作用。
A structural transition was observed in non-centrosymmetric oxyfluoride Co 3 Sb 4 O 6 F 6 at T S∼ 180 K from a cubic phase (I 4‾ 3m) to a c> a tetragonal phase (I 4‾), through high-resolution neutron and synchrotron powder diffraction. In addition, specific heat, magnetization, and dielectric measurements were performed to investigate this phase transition. Although the specific heat and dielectric constant showed anomalies at T S, no transition to a ferroelectric phase was observed in the polarization hysteresis loop down to 30 K. Moreover, a magnetic structure analysis using neutron powder diffraction data revealed a transition from a paramagnetic phase to a G-type antiferromagnetic phase at T N∼ 67 K, at which a peak was also observed in the specific heat measurements. The magnetic moments of Co 2+ were aligned along the tetragonal c-axis with a Co 2+ moment of 2.80 (1) μ B at 13 K. The rotation and deformation of the CoO 2 F 4 octahedron due to the large displacement of F atoms were observed at T S from the structural analysis, which play an important role in the structural phase transition in Co 3 Sb 4 O 6 F 6.
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