Kamiyama Sachiko, Yamada Ikuya, Fukuda Masayuki, Okazaki Yuichi, Nakamura Takashi, Nishikubo Takumi, Azuma Masaki, Kimura Hiroyuki, Yamamoto Hajime
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 Japan.
Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan.
Inorg Chem. 2022 May 23;61(20):7841-7846. doi: 10.1021/acs.inorgchem.2c00382. Epub 2022 May 9.
The nature of chemical bonds determines the electronic and magnetic properties of compounds. A metal-metal bonding (V-V dimer) and its effect on the magnetism of ilmenite-type CoVO were studied. Polycrystalline CoVO samples were synthesized using a high-pressure synthesis method. Crystal structure refinement revealed that V-V dimers exist at temperatures below 550 K in the vanadium layers. Co in CoVO exhibits an = 3/2 state, whereas a = 1/2 state was reported in ilmenite-type CoTiO. The existence of V-V dimers reduces the structural symmetry (from 3 to 1), which can change the magnetic ground state.
化学键的性质决定了化合物的电子和磁性特性。研究了金属-金属键（V-V二聚体）及其对钛铁矿型CoVO磁性的影响。采用高压合成法合成了多晶CoVO样品。晶体结构精修表明，在低于550 K的温度下，钒层中存在V-V二聚体。CoVO中的Co呈现S = 3/2态，而在钛铁矿型CoTiO中报道的是S = 1/2态。V-V二聚体的存在降低了结构对称性（从3降至1），这可能会改变磁基态。
