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Xps Study of Ni-Fe Manganite Thermistor Material

Published online by Cambridge University Press:  16 February 2011

D. N. Braski ,
N. R. Osborne  and
J. M. Zurbuchen
D. N. Braski
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
N. R. Osborne
Affiliation:
University of Dayton Research Institute, Dayton, OH 45469
J. M. Zurbuchen
Affiliation:
Yellow Springs Instruments, Inc., Yellow Springs, OH 45387
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Abstract

The resistivity of the as-fabricated thermistor material, nickel-iron-manganite, changes during initial aging in the temperature range of 150-300ºC before becoming stable.X-ray photoelectron spectroscopy (XPS) was used to determine if any valency change or chemical shift of the cations or oxygen occurred during aging. The goal of the study was to identify any ionic changes that might affect thermistor stability. The only observed changes in 2p3/2 peaks due to aging were those related to Ni ions; the same peaks for Mn, Fe, and the 0-Is peak were unchanged. The changes in the Ni 2p3/2 peak may possibly be related to: (a) the migration of Ni2+ ions from octahedral to tetrahedral sites, (b) subtle changes in the energy states of Ni2+ which promoted a more stable ionic structure, or (c) the presence of Ni3+ ions, some of which revert to Ni2s+.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 139
Copyright
Copyright © Materials Research Society 1995

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