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Magnetic and Electric Properties of Phase Separated Glass Ceramics in CoO–TiO2–SiO2 System Prepared by Melt Quenching Process

Published online by Cambridge University Press:  15 March 2011

Hiroki Nakamura ,
Tetsuo Kishi ,
Yuji Muro ,
Ryuji Tamura ,
Kazuyasu Tokiwa  and
Atsuo Yasumori
Hiroki Nakamura
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan
Tetsuo Kishi
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan Polyscale Technology Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan
Yuji Muro
Affiliation:
Department of Physics Science and Engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan Polyscale Technology Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan
Ryuji Tamura
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan Polyscale Technology Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan
Kazuyasu Tokiwa
Affiliation:
Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan Polyscale Technology Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan
Atsuo Yasumori
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan Polyscale Technology Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 27808510, Japan
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Abstract

The developments of high performance magnetic materials are required in various applications such as high sensitive magnetic sensing and hyperthermia in cancer treatment. Recently, Co-doped TiO2 has been received considerable attention as a candidate for such materials because of their ferromagnetic properties at room temperature. On the other hand, the phase-separated glasses and the derived glass-ceramics having unique micro-nano structure are utilized for various applications. In this study, the phase separated glass-ceramics in CoO-TiO2-SiO2 system with Al2O3 addition were prepared by melt-quenching process. The as-quenched samples consisted of the TiO2-rich phase and the SiO2-rich one which were formed by a nucleation-growth mechanism of phase separation. From the results of XRD measurements, the samples were found to have a TiO2 crystalline phase and a SiO2-rich glassy phase. The samples showed the magnetic property, which were regarded as a mixture of ferromagnetic and paramagnetic phases. The samples also showed the electric conductivity at room temperature. However, the conductivity of the sample decreased with increase of the Co content, and the temperature dependence of the conductivity of the ferromagnetic samples was different from the other ones. As a result, the Co ions in the phase-separated glass-ceramics in TiO2-SiO2 system were found to affect on both the magnetic and the electric conductive characteristics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1118: Symposium K – Magnetic Nanostructures by Design , 2008 , 1118-K07-03
Copyright
Copyright © Materials Research Society 2009

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