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Ultralow dielectric constant nickel–zinc ferrites using microwave sintering

Published online by Cambridge University Press:  03 March 2011

Ramesh Peelamedu ,
Craig Grimes ,
Dinesh Agrawal ,
Rustum Roy  and
Purushotham Yadoji
Ramesh Peelamedu*
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Craig Grimes
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Dinesh Agrawal
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Rustum Roy
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Purushotham Yadoji
Affiliation:
Centre for Materials for Electronics Technology (C-MET), Cherlapally, HCL(PO), Hyderabad, 500 051, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Ultralow dielectric constant values were measured on Ni–Zn ferrites prepared using Fe2O3 as a starting material and sintered in a microwave field. Significant differences in microstructure, magnetic, and dielectric properties were observed between microwave-sintered Ni–Zn ferrites prepared using Fe3O4 (T34) and those starting with Fe2O3 (T23) ingredients. Higher magnetization values observed in T23 ferrite are attributed to large grain size, possibly containing abundant domain walls and the presence of fewer Fe2+ ions. The ultralow dielectric constant values observed on T23 ferrites show that this procedure is highly suitable to prepare Ni–Zn ferrites for high-frequency switching applications.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 18 , Issue 10 , October 2003 , pp. 2292 - 2295
Copyright
Copyright © Materials Research Society 2003

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References

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