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Magnetic characterization of calcium-nickel-potassium oxide catalysts

Published online by Cambridge University Press:  03 March 2011

Dale L. Perry ,
Paul Berdahl  and
Charles Perrino
Dale L. Perry
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, California 94720
Paul Berdahl
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, California 94720
Charles Perrino
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, California 94720
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Abstract

SQUID magnetometer characterization of Ca–Ni–K–O catalyst materials reveals complex magnetic behavior. The magnetic properties are generally determined by the antiferromagnetic material NiO, but samples with traces of elemental nickel show marked effects of ferromagnetism. Potassium doping enhances the formation of metallic nickel. Further deviations from bulk NiO properties can be attributed to NiO particle size effects (superparamagnetism) and to the presence of paramagnetic impurities, possibly Ni3+ ions.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 11 , November 1994 , pp. 2993 - 2997
Copyright
Copyright © Materials Research Society 1994

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References

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