The effect of B2O3 addition to the microstructure and magnetic properties of Ni0.4Zn0.6Fe2O4 ferrite
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol.320, no.5, pp.714-718, 2008 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 320 Issue: 5
- Publication Date: 2008
- Doi Number: 10.1016/j.jmmm.2007.08.033
- Journal Name: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.714-718
- Istanbul University Affiliated: Yes
Abstract
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.