PHASE-RELATIONS AND ELECTRICAL CONDUCTIVITIES IN THE ND-CE-CU-O SYSTEM

被引：19

作者：

JORDA, JL

COHENADAD, MTS

机构：

[1] Laboratoire de Physico-Chimie Minérale 2, Université Claude-Bernard, F-69622 Villeurbanne Cédex, 43, Bd. du

来源：

JOURNAL OF THE LESS-COMMON METALS | 1991年 / 171卷 / 01期

关键词：

D O I：

10.1016/0022-5088(91)90270-E

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A systematic study by means of X-ray diffraction, differential thermal analysis coupled with thermogravimetry, scanning electron microscopy-energy-dispersive X-ray probe and high temperature resistivity of samples of the Nd-Ce-Cu-O system allowed us to determine precise phase relations in the binary NdO1.5-CuO and CeO2-CuO and ternary NdO1.5-CeO2-CuO systems. The ability of cerium to form mixed valence compounds, complemented by the reaction 2CuO --> Cu2O + 1/2O2, introduces an additional difficulty for the preparation or the high temperature heat treatment of well-defined samples. In cerium-doped specimens (Nd1-xCex)2CuO4-delta the limit of solubility was found to be x = 0.08. The solid solution is formed by non-congruent reaction at 1285-degrees-C from an Nd2O3 + CeO2 + liquid mixture. We argue that a long-range ordering may influence the electronic properties at low temperature, especially the superconductivity.

引用

页码：127 / 147

页数：21

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