THERMOGRAVIMETRIC AND HIGH-TEMPERATURE X-RAY STUDIES ON THE ORTHORHOMBIC-TO-TETRAGONAL TRANSITION OF YBA2CU3OY

被引：78

作者：

TAKAYAMAMUROMACHI, E

UCHIDA, Y

YUKINO, K

TANAKA, T

KATO, K

机构：

[1] Natl Inst for Research in Inorganic, Materials, Sakura-Mura, Jpn, Natl Inst for Research in Inorganic Materials, Sakura-Mura, Jpn

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1987年 / 26卷 / 05期

关键词：

CERAMIC MATERIALS - OXYGEN - YTTRIUM COMPOUNDS;

D O I：

10.1143/JJAP.26.L665

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Thermogravimetric experiment was performed to determine oxygen content in the high T//c superconductor YBa//2Cu//3O//y. The y varies from 5. 8 to 6. 5 depending on temperature and oxygen fugacity, indicating that the average valence of copper ions is between 2 and 1. The oxygen content is strongly affected by quenching process of a sample. High-temperature X-ray diffraction study showed orthorhombic-to-tetragonal transition (second or possibly higher order) at around 900 K. Combining this fact with the thermogravimetric data, we concluded that the compound having y less than approximately 6. 0 has a tetragonal symmetry.

引用

页码：L665 / L667

页数：3