NONSTOICHIOMETRY AND MIXED PR VALENCY IN (PR1-XSRX)(PR1-YCEY)CUO4-Z

被引：3

作者：

KITO, H

SAWA, H

AKIMITSU, J

IZUMI, F

ISHIGAKI, T

ASANO, H

机构：

[1] UNIV TSUKUBA, INST MAT SCI, SAKURA, IBARAKI 305, JAPAN

[2] NATL INST RES INORGAN MAT, SAKURA, IBARAKI 305, JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1990年 / 29卷 / 10期

关键词：

(Pr[!sub]1-x[!/sub]Sr[!sub]x[!/sub])(Pr[!sub]1-y[!/sub]Ce[!sub]y[!/sub])CuO[!sub]4-z[!/sub; Mixed valency; Neutron powder diffraction; Nonstoichiometry; Rietveld analysis;

D O I：

10.1143/JJAP.29.L1803

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structural parameters of a nonsuperconductor (Pr0.6Sr0.4)(Pr0.75Ce0.25)CuO4-z(z=0.012) were refined by the Rietveld analysis of TOF neutron powder diffraction data. It is isomorphous with a superconductor (Nd1-xSrx)(Nd1-yCey)CuO4-zand consists of K2NiF4- and Nd2CuO4-type units stacked alternately along the c-axis. An apical oxygen site in the K2NiF4unit is 1.2% deficient. Pr atoms in the Nd2CuO4unit are, at least partially, in the oxidation state +4. The origin of nonsuperconductivity in this compound is discussed from a crystal chemical point of view. © 1990 IOP Publishing Ltd.

引用

页码：L1803 / L1806

页数：4

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