特集：特徴的な原子集団を有する物質が魅せる高圧挙動
中性子で見る氷VII中の無秩序構造
キーワード:
water ice,
site disorder,
neutron diffraction,
maximum entropy method,
pair distribution function]
2023 年 33 巻 4 号 p. 246-253
詳細
2023 年 33 巻 4 号 p. 246-253
Ice VII is one of numerous ice polymorphs and is stable at room temperature between 2 and 60 GPa. Its structure can be described using a simple cubic model, so-called a single-site model, sufficient to reproduce its diffraction behaviours for most purposes. At the same time, its disordered nature of molecular orientations associated with slight displacements has been of interest. This article reviews historical challenges to elucidate its disordered structure beyond the simple model and recent achievements from in-situ neutron diffraction under high pressure with “model-free” analyses.
