OXYGEN ORDERING AND FE CONFIGURATION IN REDUCED AND RE-OXIDIZED YBA2CU3-XFEXOY

被引：3

作者：

CAI, ZX

ZHU, YM

WELCH, DO

机构：

[1] Department of Applied Science, Brookhaven National Laboratory, Upton, NY

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1992年 / 65卷 / 04期

关键词：

D O I：

10.1080/01418619208205598

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bulk samples of YBa2Cu3-xFexO7-delta (x = 0.09 and x = 0.36) were produced by a conventional sintering method. Transmission electron microscopy studies show that after reduction and subsequent low-temperature re-oxidation of the sintered sample, the orthorhombicity of the sample increases drastically. The strongly 'tweed' morphology changed into a strongly twinned one with weak tweed contrast. A two-dimensional lattice-gas model is established to study the effect of reduction and subsequent low-temperature re-oxidation on the oxygen ordering and Fe distribution in these systems. Monto Carlo simulations using Kawasaki dynamics are performed to investigate the Fe cluster formation and its effect on oxygen ordering for various Fe concentrations. The results are in very good agreement with experiments, suggesting that the structure change during the reduction and re-oxidation process can be explained by Fe clustering in CuO plane.

引用

页码：931 / 942

页数：12

共 11 条

[1] EFFECT OF SUBSTITUTIONAL IMPURITIES (AL,CO,FE,GA) ON THE ORTHORHOMBIC PHASE OF YBA2CU3O7-DELTA [J].