记忆玻璃在延长长度尺度上的拓排序
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
概括
研究人员确定了无形酸盐 (AlPO4) 的拓排序,揭示了大量的低对称相. 这种排序被认为是无形材料中"记忆玻璃"效应的原因.
科学领域:
- 材料科学
- 固态化学
- 晶体学
背景情况:
- 在非晶体固体中确定结构排序仍然是一个重大的科学挑战.
- 从短距离到长距离的等级结构,即使在无形化后也可能持续存在.
研究的目的:
- 研究压力下的酸盐 (AlPO4) 的相变和结构排序.
- 提供对AlPO4无形阶段的拓排序的明确视图.
主要方法:
- 结合X射线衍射和随机自由能量表面模拟.
- 在AlPO4中研究了可逆单晶到无形转变.
主要成果:
- 在AlPO4的无形阶段观察到拓排序.
- 确定了一群具有一致的拓连接的低对称性Carpenter相.
- 描述这些阶段为转移稳定的中间阶段.
结论:
- 在无形AlPO4中剩余的拓排序被认为是可切换的"记忆玻璃"效应的起源.
- 这种类型的拓排序可能存在于各种无形材料中,由于原子移位.
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