層状複合アニオン化合物の単結晶作製

－ 融液成長による「低次元バルク単結晶」開発 －

抄録

  Layered mixed-anion compounds possess a natural superlattice structure, where layers with significantly different properties are alternately stacked, exhibiting physical properties and functions not found in single anion compounds. On the other hand, the difficulty in synthesizing single crystals has hindered fundamental property evaluations and applications. Single crystals of such structurally complex compounds have been conventionally synthesized using methods like the flux or CVT method, where crystal size, quality, and yield were not always satisfactory. Recently, we discovered that some layered mixed-anion compounds undergo congruent melting though issues of volatilization and multinuclear growth remain. This indicates the potential for high-yield single crystal growth even in multi-component layered compounds. We therefore report on the development of these congruent melting compounds and the growth of single crystals by melt solidification. These compounds enable the growth of large single crystals while possessing low-dimensionality, expected to lead to a fields of “low-dimensional bulk single crystals”.