THE EFFECT OF HEAT-TREATMENTS ON COBALT CONFIGURATION AND PHYSICAL-PROPERTIES OF YBA2(CU1-XCOX)3OY

被引：6
|
作者：
KATSUYAMA, S
NASU, S
UEDA, Y
KOSUGE, K
机构：
[1] OSAKA UNIV,FAC ENGN SCI,DEPT MAT PHYS,TOYONAKA,OSAKA 560,JAPAN
[2] UNIV TOKYO,INST SOLID STATE PHYS,TOKYO 106,JAPAN
[3] KYOTO UNIV,FAC SCI,DEPT CHEM,KYOTO 606,JAPAN
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 1992年 / 97卷 / 02期
关键词：
D O I：
10.1016/0022-4596(92)90056-2
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
YBa2(Cu1-xCox)3Oy (0 ≦ x ≦ 1 3) was prepared by two kinds of heat treatments: (a) slow cooling from 850°C in flowing O2 gas and (b) reducing at 800°C in flowing N2 gas followed by reoxidation in flowing O2 gas below 400°C. The crystal structure, superconducting properties, and Co configuration of the materials were examined by X-ray powder diffraction, electrical resistivity, and 57Co emission Mössbauer measurements. The orthorhombic phase was stabilized in the wide composition range (0 ≦ x ≦ 0.12) by the heat treatment (b) as well as in the Fe-substituted system. This extension of the orthorhombic phase region is due to the clustering of Co atoms in the Cu1O planes, which is developed by the heat treatment under a lower oxygen fugacity atmosphere at high temperature. © 1992.
引用
收藏
页码：466 / 475
页数：10
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