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Y-type hexagonal ferrite with planar magnetocrystalline anisotropy has ultrahigh cut-off frequency up to GHz and excellent magnetic properties in hyper frequency range, so that is regarded as the most suitable material in correpongding inductive devices and components. The technology of low temperature cofired ceramics for surface-mounted multilayer chip components needs ferrite to be sintered well under 900 ℃ to avoid the melting and diffusion of Ag inner electrode during the cofiring process. To lower the sintering temperature of Y-type hexagonal ferrite, there are several methods, (1) using nano-sized starting powders, (2) substitution by low-melting elements, (3) adding sintering additives, and (4) introducing lattice defect. In this paper, the effects of different methods on the sintering behavior and the magnetic properties were discussed in detail.


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Low-fired Y-type hexagonal ferrite for hyper frequency applications

Show Author's information Yang BAIa,*( )Wenjie ZHANGaLijie QIAOaJi ZHOUb
Key Laboratory of Environmental Fracture (Ministry of Education), University of Science and Technology Beijing, Beijing 100083, China
State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

Y-type hexagonal ferrite with planar magnetocrystalline anisotropy has ultrahigh cut-off frequency up to GHz and excellent magnetic properties in hyper frequency range, so that is regarded as the most suitable material in correpongding inductive devices and components. The technology of low temperature cofired ceramics for surface-mounted multilayer chip components needs ferrite to be sintered well under 900 ℃ to avoid the melting and diffusion of Ag inner electrode during the cofiring process. To lower the sintering temperature of Y-type hexagonal ferrite, there are several methods, (1) using nano-sized starting powders, (2) substitution by low-melting elements, (3) adding sintering additives, and (4) introducing lattice defect. In this paper, the effects of different methods on the sintering behavior and the magnetic properties were discussed in detail.

Keywords: hexagonal ferrite, magnetic material, low temperature cofiring ceramics

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Publication history

Received: 03 June 2012
Accepted: 12 July 2012
Published: 08 September 2012
Issue date: June 2012

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© The author(s) 2012

Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (No. 51172020), and the Fundamental Research Funds for the Central Universities (No. FRF-TP-09-028A).

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