ミニ特集 鉱物科学における非晶質・液体の構造解析の新展開
放射光X線を用いたその場観察実験が明らかにするCaAl2O4ガラスの圧力誘起ポリアモルフィズム
2025 年 67 巻 2 号 p. 127-132
詳細
2025 年 67 巻 2 号 p. 127-132
In situ high-pressure sound velocity measurements of CaAl2O4 glass demonstrated irreversible discontinuities in the sound velocities at ~8–10 GPa. In situ high-pressure synchrotron x-ray diffraction measurements showed an intermediate-range structure change attributed to a rearrangement of calcium ions over this narrow pressure region. Atomistic models obtained from molecular dynamics simulations revealed that this structure change originates from a transition from a bimodal Ca-O void radius distribution including voids larger than ~2.4 Å to a unimodal distribution without the large voids.
