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在高温和高压下,范德瓦尔斯铁电CuInP2Se6的结构,电子和铁电过渡

Meiling Hong¹, Lidong Dai¹, Haiying Hu¹

¹Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Beijing, Guizhou 550081, China.

The Journal of chemical physics

|March 10, 2025

概括

铜二脱化物 (CuInP2Se6) 在高压下表现出可逆的铁电和结构相位过渡. 它的电性质发生变化,表现出金属化和欧米反应,具有成熟的铁电相极限.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
固态化学固态化学

背景情况:

CuInP2Se6是一种具有潜在铁电性能的分层材料.
了解其在极端条件下的行为对于新的电子应用至关重要.

研究的目的:

在高压和高温条件下全面研究CuInP2Se6的铁电,结构和电传输特性.
阐明水静态和非水静态环境对其相变和金属化的影响.

主要方法:

拉曼光谱检测结构和振动变化.
测量电导率以研究传输特性.
高分辨率传输电子显微镜 (HRTEM) 用于结构分析.

主要成果:

在非水静压下,在5.4和14.1GPa下观察到两个连续的相变,然后在25.1GPa下进行金属化.
在水静态条件下进行电子转换的~2.0 GPa压力歇斯底里.
在减压时的可逆相位过渡与显著的压力歇斯底里.
在高压下的欧姆反应,以线性电流-电压特征表示.
通过拉曼光谱学证明了铁电交叉,确定了298-873 K和0.4-40.3 GPa之间的相界 (TC (K) =165.5 P (GPa) +292.1) .

结论:

在极端压力下,CuInP2Se6表现出复杂的相变和金属化.
水静态条件影响电子转换并引入hysteresis.
该材料具有可逆的铁电行为,具有明确的相界限,对基本的理解和应用具有重要意义.

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