延長された長さスケール上のメモリーグラスのトポロジカルオーダーリング
Sheng-Cai Zhu1, Gu-Wen Chen1, Dongzhou Zhang2
1School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.
Journal of the American Chemical Society
|April 14, 2022
まとめ
研究者は,無形アルミニウムリン酸 (AlPO4) のトポロジカルオーダーリングを特定し,低対称性の相群を明らかにした. この順序は,無形材料の"記憶ガラス"効果の原因として提案されています.
科学分野:
- 材料科学
- 固体化学
- クリスタルグラフィー
背景:
- 非結晶の固体における構造的順序を特定することは依然として重要な科学的な課題です.
- 短距離から長距離までの階層構造は,無形化後でも持続する可能性があります.
研究 の 目的:
- 圧力下でのアルミニウムリン酸 (AlPO4) の相変化と構造的順序を調査する.
- AlPO4の無形相におけるトポロジカル・オーダーリングの曖昧な見方を提供する.
主な方法:
- 組み合わせたX線微分とストキャスティック自由エネルギー表面シミュレーション.
- AlPO4における反転可能な単結晶から無形の移行を研究した.
主要な成果:
- AlPO4の無形相における観測されたトポロジカル・オーダーリング
- 一貫したトポロジカルなリンクを持つ カーペンター低対称相群を特定した.
- これらの段階をメタステーブルな中間段階として特徴付けました.
結論:
- 変形性AlPO4の残りのトポロジカル・オーダーリングは,切り替え可能な"メモリー・グラス"効果の起源として提案されている.
- このタイプのトポロジカル・オーダーリングは,原子の移動により,様々な無形な材料に存在する可能性があります.
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