Bi系高温超导体中非公度调制结构相的空间群测定

金属学报

2009, Vol. 45

Issue (6): 673-679

论文

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Bi系高温超导体中非公度调制结构相的空间群测定

边为民¹; 朱溢眉²; 周廉³

1.东北大学研究院; 沈阳 110004
2.Brookhaven National Laboratory; Upton NY 11973; USA
3.西北有色金属研究院; 西安 710016

DETERMINATION OF SPACE GROUP OF INCOMMENSURATE MODULATION STRUCTURE PHASES IN Bi HIGH TEMPERATURE SUPERCONDUCTORS

BIAN Weimin¹; ZHU Yimei²; ZHOU Lian³

1.Research Institute; Northeastern University; Shenyang 110004
2.Brookhaven National Laboratory; Upton NY 11973; USA
3.Northwest Institute for Nonferrous Metal Research; Xi'an 710016

引用本文:

边为民朱溢眉周廉. Bi系高温超导体中非公度调制结构相的空间群测定[J]. 金属学报, 2009, 45(6): 673-679.
. DETERMINATION OF SPACE GROUP OF INCOMMENSURATE MODULATION STRUCTURE PHASES IN Bi HIGH TEMPERATURE SUPERCONDUCTORS[J]. Acta Metall Sin, 2009, 45(6): 673-679.

全文: PDF(3136 KB)

摘要:

采用会聚束电子衍射 (CBED) 对Bi--2212相和Bi--2223相中具有非公度调制结构的超胞结构进行了测定. 测定结果表明: 具有 A型调制结构Bi--2212相超胞的点群是2mm, 空间群是I2mm; 具有B型调制结构Bi--2223相超胞的点群是mmm, 空间群是Ibmm. 结合实验结果讨论了摇摆曲线对CBED图对称性的影响, 并指出: 采用CBED测定晶体结构的对称性时, 应以高阶Laue线为依据, 而不应依靠0层盘内摇摆曲线的对称性. CBED图模拟结果表明: Bi--2212相CBED图显示的是调制结构超胞的对称性, 而不是亚胞的对称性.

关键词 ： Bi系高温超导体, 会聚束电子衍射, Bi--2212相, Bi--2223相, 非公度调制结构, 空间群

Abstract：

The investigation of microstructures of the Bi--2212 and Bi--2223 phases in Bi high temperature superconductors is very significant for improving technology of production and researching superconducting properties and mechanisms. The determination of space groups for the Bi--2212 and Bi--2223 phases is a key problem, which is very complicated because of their incommensurate modulation structures. The supercell structures of the Bi--2212 and Bi--2223 phases with incommensurate modulation structures were determined by convergent beam electron diffraction (CBED). The point group of the supercell of the Bi--2212 phase with type A modulation structure is 2mm, its space group is I2mm. The point group of the supercell of the Bi--2223 phase with type B modulation structure is mmm, its space group is Ibmm. The effects of the rocking curve for the symmetries of CBED patterns were discussed according to experimental results. The simulation results of CBED patterns for the Bi--2212 phase confirmed the symmetries of CBED patterns to be the symmetries of the supercell with modulation structure, but not to be the symmetries of the subcell structure.

Key words： Bi high temperature superconductor convergent beam electron diffraction (CBED) Bi--2212 phase Bi--2223 phase incommensurate modulation structure space group

收稿日期: 2008-11-19

ZTFLH:

TG111

基金资助:

美国能源部材料科学司基础能源科学办公室资助项目DE--AC02--76CH00016

作者简介: 边为民, 男, 1950年生, 副研究员, 博士

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https://www.ams.org.cn/CN/ 或 https://www.ams.org.cn/CN/Y2009/V45/I6/673

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