The effect of B2O3 addition to the microstructure and magnetic properties of Ni0.4Zn0.6Fe2O4 ferrite |
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Authors: | Berat Yuksel Sebahattin Kirtay T. Osman Ozkan Engin Acikalin Hilkat Erkalfa |
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Affiliation: | 1. Istanbul University, Engineering Faculty, Metallurgical and Materials Engineering Department, Avc?lar, 34320 Istanbul, Turkey;2. TUBITAK, Marmara Research Centre, P.O. Box 21, Gebze, Kocaeli, Turkey |
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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 °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 °C gave the optimum magnetic properties of Br=170 mT, Hc=0.025 kA/m and a high initial permeability value of μi=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. |
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Keywords: | 75.50.Gg 75.50.&minus y 76.60.Es |
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