A NEUTRON POWDER DIFFRACTION STUDY OF BA2YCU3O

被引：62

作者：

COX, DE

MOODENBAUGH, AR

HURST, JJ

JONES, RH

机构：

[1] Brookhaven Natl Lab, Upton, NY, USA, Brookhaven Natl Lab, Upton, NY, USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1988年 / 49卷 / 01期

关键词：

BARIUM COMPOUNDS - Structure - CERAMIC MATERIALS - Structure - NEUTRONS - Diffraction;

D O I：

10.1016/0022-3697(88)90133-3

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The structure of an orthorhombic sample of Ba//2YCu//3O//7 with a superconducting transition at 89 K has been determined by Rietveld profile analysis of neutron powder diffraction data. The space group chosen was Pmmm. The structure may be viewed as a heavily-distorted oxygen-defective ordered derivative of a perovskite-type structure. Two-thirds of the Cu atoms have four near-neighbor oxygens and one more distant neighbor in a tetragonal pyramidal arrangement, and form a two-dimensional network in the ab planes linked through corner shared oxygens about 0. 3 Angstrom out of the planes. The remaining one-third of the Cu atoms have fourfold planar coordination in the bc planes and form chains linked through corner-shared oxygens along the b axis.

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页码：47 / 52

页数：6

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