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Novel Critical Temperature Resistor of Sintered Ni–Fe–O Nanosized Powders

Published online by Cambridge University Press:  03 March 2011

H. Suematsu ,
K. Ishizaka ,
Y. Kinemuchi ,
T. Suzuki ,
W. Jiang  and
K. Yatsui
H. Suematsu*
Affiliation:
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan
K. Ishizaka
Affiliation:
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan
Y. Kinemuchi
Affiliation:
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan
T. Suzuki
Affiliation:
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan
W. Jiang
Affiliation:
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan
K. Yatsui
Affiliation:
Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan
*
a)Address all correspondence to this author. e-mail: suematsu@nagaokaut.ac.jp
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Abstract

Nanosized powders of Ni–Fe–O were synthesized by a pulsed wire discharge method and sintered at 600 °C for 1 h in air. Abrupt electrical resistivity changes were observed in the temperature dependence of resistivity for the sintered Ni–Fe–O powders above 203 °C. Similar resistivity curves, which had been observed in V–O samples and had been used for the critical temperature resistors, had never been reported in Ni–Fe–O samples. Possible mechanisms to explain the resistivity change in NiFe2O4, including order-disorder transition, semiconductor-metal transition, and surface spin pinning, are discussed.

Keywords

Powder processingMagnetic propertiesElectrical properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 4 , April 2004 , pp. 1011 - 1014
Copyright
Copyright © Materials Research Society 2004

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