Synthesis and Characterization of Temperature Sensitive Li–Zn–Cu Ferrite

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概要

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• The authors have fabricated the polycrystalline Li–Zn–Cu ferrite as a new temperature sensitive ferrite. The Li–Zn–Cu ferrite had high-frequency permeability profile and high electrical resistivity as well as the Ni–Zn–Cu ferrite for multilayered surface-mounting device such as a high-frequency chip inductor and filter. Since the new Li–Zn–Cu ferrite had both excellent high-frequency magnetic property and temperature sensitivity, it will be suitable for miniaturization of high-frequency inductive temperature sensing device. In this study, the relationship between grain size and the temperature-dependent magnetic properties of polycrystalline Li–Zn–Cu ferrite has been investigated. Three kinds of the Li–Zn–Cu ferrites sintered with Bi2O3 at different temperature were synthesized, and their temperature characteristics were evaluated. The most important result obtained is as follows: as the sintering temperature rose the coarse grain increased without changing bulk density, the permeability and its temperature dependence can be enhanced by grain growth due to higher sintering temperature. Therefore, the temperature dependent permeability of the Li–Zn–Cu ferrite can be controlled by grain size only without a change of the chemical composition.

• 2008-01-25

著者

• Sato Toshiro

  Spin Device Technology Center, Shinshu University, Nagano 380-8553, Japan

• Yamasawa Kiyohito

  Spin Device Technology Center, Shinshu University, Nagano 380-8553, Japan

• Miura Yoshimasa

  Spin Device Technology Center, Shinshu University, Nagano 380-8553, Japan

• Naoe Masayuki

  Spin Device Technology Center, Shinshu University, Nagano 380-8553, Japan

• Omura Tomoaki

  Spin Device Technology Center, Shinshu University, Nagano 380-8553, Japan

関連論文

• Synthesis and Characterization of Temperature Sensitive Li–Zn–Cu Ferrite

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