The effect of B2O3 addition to the microstructure and magnetic properties of Ni0.4Zn0.6Fe2O4 ferrite

被引：24
作者：
Yuksel, Berat [1 ]
Kirtay, Sebahattin [1 ]
Ozkan, T. Osman [1 ,2 ]
Acikalin, Engin [2 ]
Erkalfa, Hilkat [2 ]
机构：
[1] Istanbul Univ, Fac Engn, Dept Mat & Met Engn, TR-34320 Istanbul, Turkey
[2] TUBITAK, Marmara Res Ctr, Gebze, Kocaeli, Turkey
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 05期
关键词：
ferrite; ferrimagnetic; magnetic material; magnetic hysteresis;
D O I：
10.1016/j.jmmm.2007.08.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of 0.01 and 0.1 mol B2O3 addition to the microstructure and magnetic properties of a Ni-Zn ferrite composition expressed by a molecular formula of Ni0.4Zn0.6Fe2O4 were investigated. The toroid-shaped samples prepared by pressing the milled raw materials used in the preparation of the composition were sintered in the range of 1000-1300 degrees C. The addition of 0.01 mol B2O3 increased the grain growth and densification giving rise to reduced intergranular and intragranular porosity due to liquid-phase sintering. The sintered toroid sample at 1300 degrees C gave the optimum magnetic properties of B-r = 170 mT, H-c = 0.025 kA/m and a high initial permeability value of mu(i) = 4000. The increment of the B2O3 content to 0.1 mol resulted in a pronounced grain growth and also gave rise to large porosity due to the evaporation of B2O3 at higher sintering temperatures. Hence, it resulted in an air-gap effect in the hysteresis curves of these samples. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：714 / 718
页数：5
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