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Microwave Absorbing Ferrite Thin Films for Microwave Heating of Microstructured Reactors

Published online by Cambridge University Press:  31 January 2011

Pengzhao Gao ,
Evgeny V. Rebrov ,
Jaap C. Schouten ,
Richard Kleismit ,
John Cetnar ,
Guru Subramanyam  and
Gregory Kozlowski
Pengzhao Gao
Affiliation:
[email protected], Hunan University, Materials Science and Engineering, Changsha, China
Evgeny V. Rebrov
Affiliation:
[email protected], Eindhoven University of Technology, Eindhoven, Netherlands
Jaap C. Schouten
Affiliation:
[email protected], Eindhoven University of Technology, Eindhoven, Netherlands
Richard Kleismit
Affiliation:
[email protected], Wright State University, Physics, Dayton, Ohio, United States
John Cetnar
Affiliation:
[email protected], Wright State University, Physics, Dayton, Ohio, United States
Guru Subramanyam
Affiliation:
[email protected], University of Dayton, Electrical &Computer Engineering, Dayton, Ohio, United States
Gregory Kozlowski
Affiliation:
[email protected], Wright State University, Physics, Dayton, Ohio, United States
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Abstract

Nanocrystalline Ni0.5Zn0.5Fe2O4 thin films have been synthesized with various grain sizes by sol–gel method on polycrystalline silicon substrates. The morphology and microwave absorption properties of the films calcined in the 673–1073 K range were studied by using XRD, AFM, near–field evanescent microwave microscopy, coplanar waveguide and direct microwave heating measurements. All films were uniform without microcracks. The increase of the calcination temperature from 873 to 1073 K and time from 1 to 3h resulted in an increase of the grain size from 12 to 27 nm. The complex permittivity of the Ni-Zn ferrite films was measured in the frequency range of 2–15 GHz. The heating behavior was studied in a multimode microwave cavity at 2.4 GHz. The highest microwave heating rate in the temperature range of 315–355 K was observed in the film close to the critical grain size of 21 nm in diameter marked by the transition from single– to multi–domain structure of nanocrystals in Ni0.5Zn0.5Fe2O4 film and by a maximum in its coercivity.

Keywords

sol-gelmicrowave heatingferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1222: Symposium DD – Microelectromechanical Systems — Materials and Devices III , 2009 , 1222-DD05-09
Copyright
Copyright © Materials Research Society 2010

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