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Multi-step sintering processing of ferrites having enhanced magnetic properties

Published online by Cambridge University Press:  22 January 2019

Ning Jia*
Affiliation:
University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
Huaiwu Zhang
Affiliation:
University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
Vincent G. Harris
Affiliation:
Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, MA02115USA
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Abstract

Traditional synthesis of high-performance bulk ferrites include complex sintering procedures where temperature and soak times to obtain high densities and excellent magnetic properties. Most ferrites must be sintered at hundreds degree centigrade approaching or surpassing 1000oC, and for YIG (yttrium iron garnet), the sintering temperature should be approximately 1450°C. The high sintering temperatures limit the applications of ferrites, for example, the low temperature co-sintering of ceramics with silver electrodes and/or ground planes. For decades, researchers have explored the use of ion-doping, sintering aids, and microstructural refinement. Here, we study the optimization of the sintering profile including multiples temperature and soak times for doped Bi-YIG simples. The results show an improvement in soft magnetic and gyromagnetic properties attributed to the homogenization of grain size and morphology.

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Copyright
Copyright © Materials Research Society 2019 

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