A NEW DOMAIN-STRUCTURE IN YBA2CU3O7-X PREPARED BY THE QUENCH AND MELT GROWTH (QMG) PROCESS

被引：28

作者：

KIMURA, M ^{[1
]}

TANAKA, M ^{[1
]}

HORIUCHI, H ^{[1
]}

MORITA, M ^{[1
]}

TANAKA, M ^{[1
]}

MATSUO, M ^{[1
]}

MORIKAWA, H ^{[1
]}

SAWANO, K ^{[1
]}

机构：

[1] UNIV TOKYO,FAC SCI,TOKYO 113,JAPAN

来源：

PHYSICA C | 1991年 / 174卷 / 4-6期

关键词：

D O I：

10.1016/0921-4534(91)91556-J

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Crystallographic analyses have revealed a new "domain structure" in YBa2Cu3O7-x (123) prepared by the quench and melt growth (QMG) process. The analyses were carried out by X-ray diffractometry: a kind of pole figure method and an improved technique of microarea X-ray diffraction. The "domain structure" is composed of crystallographic units which are aligned in two-dimensions; the c-axes of them are parallel to each other and there is a slight deviation in directions of their a- and b-axes. The degree of deviation of them differs in scale: macrograins (approximately 10 mm), subgrains (approximately mm) and crystallites (approximately 100-mu-m) and it is about a few degrees in scale of crystallites. The "domain structure" in QMG-processed materials is closely related to their high J(c) values, J(c) > 10(4) A/cm2 at 77 K under a magnetic field of 1 T. Crystallographic units in the "domain structure" are more strongly linked in superconducting than those in conventionally sintered specimens. The control of the "domain structure" is one of the most important factors for improving properties of superconductors.

引用

页码：263 / 272

页数：10

共 19 条

[1] MAGNETIZATION OF HIGH-FIELD SUPERCONDUCTORS [J].