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Precise structural analyses of advanced materials under high-pressure and high-temperature

高温高圧下における先端材料の精密構造解析

吉朝 朗*; 村井 敬一郎*; 有馬 寛*; 片山 芳則

Yoshiasa, Akira*; Murai, Keiichiro*; Arima, Hiroshi*; Katayama, Yoshinori

高圧下での先端材料の精密構造解析がX線吸収微細構造(XAFS)と回折手法のそれぞれの利点を活用して行われた。高温高圧下その場観察測定は放射光施設とマルチアンビル型大容量圧力装置を用いて行われた。XAFSスペクトルは高温高圧下の相関係の研究に有用である。XAFSデバイワラー因子は圧力や温度に依存する非調和有効ポテンシャルを与える。フォノンのエネルギーと非調和性はおもに局所構造と結合の性格に影響される。

Precise structure analyses of advanced materials under pressure were performed using each advantage of X-ray absorption fine structure (XAFS) and diffraction methods. Measurements were performed in-situ under pressure and temperature using a large-volume multi-anvil pressure apparatus and synchrotron radiation. XAFS spectra are useful for phase study under high temperature and high pressure. The XAFS Debye-Waller factor provides anharmonic effective pair potential with a pressure-dependent and temperature-independent shape. The phonon energies and anharmonicity are affected largely by the change in local structure and bonding character.

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パーセンタイル:100

分野:Physics, Applied

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