CoVO3 高压多态:要订单还是不订单?
Elena Solana-Madruga1,2, Olivier Mentré1, Alexander A Tsirlin3
1UMR-8181-UCCS-Unité de Catalyse et Chimie du Solide, Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, Lille, F-59000, France.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 16, 2023
概括
这项研究在不同压力下呈现了瓦纳酸盐 (CoVO3) 的两种多态,揭示了不同的磁性和阴离子排列. 这些发现扩大了对高压矿材料的理解.
科学领域:
- 固态化学 固态化学
- 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
背景情况:
- 材料的特性是由组成和结构决定的.
- ABO3氧化物表现出基于阴离子排序的多种物理性质,形成矿或金刚石衍生物.
- 存在于多种结构形式的材料为结构与属性关系提供了独特的见解.
研究的目的:
- 为了研究瓦纳酸盐 (CoVO3) 多态的结构和磁性特性.
- 探索压力对CoVO3.3结构修改的影响以及由此产生的磁性行为.
- 了解瓦纳在CoVO3-I的磁性特性中的作用以及CoVO3-II中的磁性挫折.
主要方法:
- 在中度 (8-12 GPa) 和高压 (22 GPa) 两种多态 (CoVO3-I和CoVO3-II) 中合成CoVO3.
- 合成的多态体的结构和磁性属性的表征.
- 第一个原则计算以阐明电子和磁相互作用.
主要成果:
- 在网中,CoVO3-I表现出蜂式的状磁性结构,其中起着至关重要的作用.
- CoVO3-II显示集群玻璃磁性行为由于两个独立的相互穿透的反铁磁Co和铁磁V-hcp子网,导致磁性挫折.
- CoVO3-II是第一个具有LiNbO3类型结构的氧化物,含有自由d电子的Co和V.
结论:
- 在CoVO3多态体中的离子分布显著影响它们的磁性.
- 瓦纳的影响对CoVO3-I的磁性行为至关重要,这与之前的假设相反.
- CoVO3的多态突出显示了高压A位点矿的更广泛的相场.
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