YBA2CU3O6.8 - AN OXYGEN-RICH 123-TYPE PHASE WITH TETRAGONAL SYMMETRY

被引：26

作者：

CAIGNAERT, V

HERVIEU, M

WANG, J

DESGARDIN, G

RAVEAU, B

BOTEREL, F

HAUSSONNE, JM

机构：

[1] Laboratoire CRISMAT, ISMRa, Université de Caen, 14032 Caen Cedex, Boulevard du Maréchal Juin

[2] Laboratoire Céramique et Technologie des Composant Passifs CNET Lannion B, 22301 Lannion Cedex, route de Trégastel

来源：

PHYSICA C | 1990年 / 170卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90240-F

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new oxygen-rich 123-phase, YBa2Cu3O6.8, with tetragonal symmetry has been synthesized with c/a=3. Its mean structure has been determined from powder neutron diffraction. The HREM study shows the existence of microdomains, oriented at 90°, resulting from the lack of mismatch between a and c (c rigorously equal to 3a). Another striking characteristic concerns the very dense microtwinning, with 〈110〉 twin boundaries spaced from 22 Å to 65 Å. Structural models are proposed, taking into consideration copper disproportion and a reasonable coordination for copper. The lack of superconductivity in this oxide, in spite of its rather high Cu (III) content is discussed. © 1990.

引用

页码：139 / 152

页数：14

共 29 条

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