Effect of Cu substitution on conductivity of Ni-Al ferrite

被引：40

作者：

Ata-Allah, SS ^{[1
]}

Fayek, MK ^{[1
]}

机构：

[1] Atom Energy Author, Nucl Res Ctr, Reactor & Neutron Phys Dept, Cairo, Egypt

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2000年 / 61卷 / 09期

关键词：

oxides; semiconductivity; electrical conductivity;

D O I：

10.1016/S0022-3697(00)00010-X

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Electrical properties of Cu substituted Ni-Al ferrite Ni1-xCuxAl3Fe2-yO4, with (0.0 < x < 1.0 and y = 1.0) are investigated by a.c, conductivity measurements in the frequency range (10(2)-10(5) Hz) and over the temperature range (300-600 K). The obtained results of these materials reveal a semiconducting behavior at low concentration of Cu. A semiconducting-to-metallic transition has been observed with increasing Cu content in these compounds. All studied compositions exhibit a transition with change in the slope of conductivity versus temperature curve. This transition temperature is found to decrease linearly with increasing Cu concentration x. The results of conductivity measurements an explained in the light of the cation-anion-cation and cation-cation interactions at the octahedral B-sites. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：1529 / 1534

页数：6

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