STRUCTURE OF LA2CU2O5 BY HIGH-RESOLUTION SYNCHROTRON X-RAY-POWDER DIFFRACTION

被引：24

作者：

LAPLACA, SJ ^{[1
]}

BRINGLEY, JF ^{[1
]}

SCOTT, BA ^{[1
]}

COX, DE ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973

来源：

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS | 1993年 / 49卷

关键词：

D O I：

10.1107/S0108270193001891

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dicopper(II) dilanthanum pentaoxide, La2Cu2O5, M(r) = 484.90, orthorhombic, Pbam. At T = 300 K: a = 5.5490 (1), b = 10.4774 (2), c = 3.8796 (1) angstrom, V = 225.557 (8) angstrom3, Z = 2, D(x) = 7.139 g cm-3, lambda = 1.2000 angstrom. Final R(I) = 6.20, R(p) = 14.6 and R(wp) = 20.61%, 124 independent reflections observed. The structure has been refined from high-resolution synchrotron X-rav powder diffraction data using the Rietveld method. It is of the oxygen-defect perovskite type and is composed entirely of corner-shared CuO5 square pyramids, which share oxygen vacancies forming vacancy tunnels along the c axis. The La atoms reside at a perovskite-like A-site and are tenfold coordinated by oxygen.

引用

页码：1415 / 1417

页数：3

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