Browne Alexander J, Lithgow Calum, Kimber Simon A J, Attfield J Paul
Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , West Mains Road , Edinburgh EH9 3FD , United Kingdom.
Diffraction Group, Neutron Sciences Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States.
Inorg Chem. 2018 Mar 5;57(5):2815-2822. doi: 10.1021/acs.inorgchem.7b03221. Epub 2018 Feb 21.
The structures and properties of vanadium oxides are often related to the formation of molecule-like clusters of vanadium cations through direct V-V bonding. GaVO, a new vanadium spinel, was synthesized. Powder diffraction and X-ray total scattering studies, complemented by magnetization and resistivity measurements, reveal that the low-temperature phase of this material is structurally distorted and features ordered pairs of three- and four-atom vanadium clusters. These clusters persist into a disordered cubic phase above the charge-ordering transition at T = 415 K. Furthermore, quasi-elastic neutron scattering indicates that the disordered clusters remain well-defined and static to 1100 K.
钒氧化物的结构和性质通常与通过直接V-V键形成的类分子钒阳离子簇有关。合成了一种新型钒尖晶石GaVO。粉末衍射和X射线全散射研究，辅以磁化和电阻率测量，表明该材料的低温相在结构上发生了畸变，其特征是三原子和四原子钒簇的有序对。这些簇在T = 415 K的电荷有序转变以上持续到无序立方相。此外，准弹性中子散射表明无序簇在1100 K时仍保持清晰定义且静态。
