Rare earth doping effect on the structural and electrical properties of Mg-Ti ferrite

被引：128

作者：

Ahmed, MA ^{[1
]}

Ateia, E ^{[1
]}

El-Dek, SI ^{[1
]}

机构：

[1] Cairo Univ, Fac Sci, Dept Phys, Giza, Egypt

来源：

MATERIALS LETTERS | 2003年 / 57卷 / 26-27期

关键词：

rare earth doping effect; structural and electrical properties; Mg-Ti ferrite;

D O I：

10.1016/S0167-577X(03)00300-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrical properties, shrinkage, porosity and X-ray diffraction analysis for Mg-Ti ferrite of the general formula Mg1+xTixRyFe2-2x-yO4; x=0.5, y=0, 0.025 and R=(Nd, Gd and La) were studied. The investigated samples were crystallized in the spinel phase. The measurements of the electrical properties were carried out at different temperatures (295-750 K) as a function of the applied frequency (50-1000 kHz). The experimental results show that. the rare earth ions initiate new sites called dodecahedral (C-sites) and at the same time increase the valence exchange between the different metal ions existing in the different sites. This behavior takes place at certain concentrations of the rare earth ions. The low rare earth concentration as well as the high sintering times (100 h) leads to an inflection in the electrical properties. Verwey conduction mechanism and hopping are used to interpret the conductivity of the samples. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：4256 / 4266

页数：11

共 14 条

[1] Heating rate effect on the electrical properties of MnxZn1-xFe2O4 ferrite (x=0.28, 0.48, 0.64 and 0.76) [J].