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拉德尔斯登 - 波普尔尼基酸盐中的多态性La₃Ni₂O₇:发现具有独特层叠加的隐藏相

Xinglong Chen¹, Junjie Zhang¹, Arashdeep S Thind²

¹Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.

Journal of the American Chemical Society

|January 31, 2024

概括

研究人员发现了一种新的Ruddlesden-Popper (RP) 尼基酸聚合物,其单层和三层块交替. 这种无机固体表现出独特的堆叠序列,为新的材料应用铺平了道路.

科学领域:

无机化学
固态物理
材料科学

背景情况:

拉德尔斯登-波珀 (RP) 阶段是无机固体,以矿块的均堆叠而闻名.
多态性,多个晶体结构的存在,在RP阶段是罕见的.
双层La3Ni2O7是一种已知的RP相,最近有报道称它具有高温超导性.

研究的目的:

报告两层RP相La3Ni2O7的新型多态的发现.
描述这种新材料的独特结构特征和物理特性.
探索这一发现对RP材料和超导性的影响.

主要方法:

结晶分析以确定结构和空间组.
运输测量以调查电气性能.
分析NiO6八面体的堆叠序列.

主要成果:

发现了一种新型的RP尼基酸多态体,具有单层和三层块的"1313"堆叠序列.
在空间组Cmmm中索引的晶体, 有证据表明伊玛目变种.
运输测量显示金属行为和电荷密度波转变在T ≈ 134K.
这种多态性可能会影响RP材料和超导性研究.

结论:

在RP尼基酸盐中发现连贯的多态性是一个重要的发现.
这种新的堆叠序列为调整材料特性提供了新的途径.
这项工作可能有助于对RP材料的理解和应用,特别是在超导领域.

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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....