TOPICAL REVIEW: Chemistry and structure of Hg-based superconducting Cu mixed oxides
TOPICAL REVIEW: Chemistry and structure of Hg-based superconducting Cu mixed oxides
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专题综述：汞基超导铜混合氧化物的化学和结构
DOI：
10.1088/0953-2048/15/7/201
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发表时间：
2002
影响因子：
3.6
通讯作者：
S. Putilin
中科院分区：
文献类型：
--
作者：
E. Antipov;A. M. Abakumov;S. Putilin
本文综述了HgBa 2Can − 1CunO 2n +2+δ超导体的热力学、制备、晶体结构以及常压和高压下的超导性质。作为一个例子，讨论了启发作者寻找新的超导体之间的汞基复杂的铜酸盐的想法说明共生结构形成的概念的好处，为新的层状材料的设计。总结了近年来有关固-气平衡的研究结果，这些结果对于不同同系物的可重复合成是有用的。的晶体结构进行了讨论，主要注意力集中在功能，如浓度和位置的额外的氧原子，静态原子位移，由于部分占领的氧网站在汞层，取代在汞的位置和存在的堆垛层错。结果表明，这些因素必须考虑到一个正确的结构描述。概述了Tc、掺杂水平、额外阴离子的量和形式电荷与外压之间的关系，预测了提高复杂铜酸盐超导性能的可能途径。
The most relevant aspects of thermodynamics, preparation, crystal structure and superconducting properties under ambient and high pressure of HgBa2Can−1CunO2n+2+δ superconductors are reviewed in this contribution. The ideas which inspired authors to search for the new superconductors among Hg-based complex cuprates are discussed as an example illustrating the benefit of the concept of intergrowth structure formation for the design of new layered materials. Recent results on solid–gas equilibriums useful for reproducible syntheses of different homologues are summarized. The crystal structures are discussed with main attention focused on features such as concentration and location of extra oxygen atoms, static atomic displacements due to partial occupation of oxygen site in a Hg-layer, substitution in a Hg position and a presence of stacking faults. It is shown that these factors have to be taken into account for a correct structure description. The relationships between Tc, doping level, amount and formal charge of extra anions and external pressure are outlined to predict possible paths for enhancement of the superconducting properties in complex cuprates.