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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1409 (January) (2013)  >  pp.54-61

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1409 (January) (2013)   pp.54 - 61 Next article>>

Low-temperature fabrication of NiCuZn Ferrite–(Ba0.7Sr0.3)TiO3 composites using granulated powders

Naoto KITAHARA1), Hiroaki KAGEYAMA2), Tomoya KAWASAKI2), Kazutomo ABE2), Hidenobu ITOH3), Junichi TAKAHASHI2)
1) Graduate School of Engineering, Tokyo Polytechnic University 2) Faculty of Engineering, Hokkaido University 3) Department of Materials Science, Kitami Institute of Technology

NiCuZn ferrite–(Ba0.7Sr0.3)TiO3 (BST) composite ceramics with the BST content of up to 50 vol % were fabricated by sintering compacted powder mixtures at 900°C. The granulation of the BST powder and addition of a Bi2O3-based oxide additive effectively assisted the densification of the composite samples. The samples thus fabricated showed required εr values whereas their μr values were considerably reduced, especially for those with lower BST contents. From the detailed examinations on the effect of the Bi2O3-based oxide additives and on the process modification to improve the reduced μr values, the addition of a Bi2O3–ZnO additive with the eutectic composition of as low as 1 wt % was enough to produce a densified 10 vol % BST composite sample with a highest μr value. It was also found that the incorporation of ferrite granules calcined at 600°C caused further improvement of μr. Thus, a densified 10BST composite sample with μr = 125 was fabricated by low-temperature sintering at 900°C.


Keyword:
NiCuZn ferrite, (Ba0.7Sr0.3)TiO3, Composite ceramics, Granulated powder, Bi2O3-based additive, Low-temperature sintering

Received: July 31, 2012
Accepted: October 23, 2012 , Published online: January 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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