イルメナイト型バナジウム酸化物の構造物性研究

抄録

This report presents the V‒V dimerization phenomena observed in ilmenite-type vanadium oxides（AVO₃）, synthesized using a high-pressure-high-temperature method. Crystal structure refinements and physical property measurements indicate that V‒V dimerization arises from the formation of covalent bonds between vanadium ions. This phenomenon is accompanied by significant changes in the crystal structure, as well as metal-insulator and magnetic-nonmagnetic phase transitions. The temperature at which V‒V dimerization occurs is influenced by the A-site ionic radius and structural distortions. In this report, we discuss the mechanism from the perspective of crystal structure. By gaining a deeper understanding of the crystal structure and electronic states of ilmenite-type vanadium oxides, we aim to establish the fundamental principles governing this material.