STUDIES ON THE THERMAL-BEHAVIOR OF BA2YCU3O7-X BY X-RAY-POWDER DIFFRACTION METHOD

被引：60

作者：

YUKINO, K

SATO, T

OOBA, S

OHTA, M

OKAMURA, FP

ONO, A

机构：

[1] National Institute for Research in Inorganic Materials, Sakura-mura, Niihari-gun, Ibaraki, 305

来源：

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

关键词：

D O I：

10.1143/JJAP.26.L869

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Thermal behavior of Ba2YCu3O7-x was investigated mainly by X-ray powder diffraction method between 70 K and 1173 K. Oxygen-rich x ∼0.5) specimen is orthorhombic in symmetry in the temperature range between 70 K and 943 K. It undergoes a phase transition to tetragonal form at 943 K or 783 K in air or N2 gas, respectively. On the other hand, oxygen-poor specimen x ∼1.0) semiconductive down to 4.2 k is tetragonal up to 1173 K in N2 gas. Thermal expansion coefficient of a cell parameter is about 1.1 × 10-5 k-1 and that of c cell parameter is 2.5 × 105 k-1in air. © 1987 IOP Publishing Ltd.

引用

页码：L869 / L870

页数：2

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