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Structure and Magnetism of Nanocrystalline KδMnO2

Published online by Cambridge University Press:  10 February 2011

R.M. Stroud ,
E. Carpenter ,
V.M. Browning ,
J.W. Long ,
K.E. Swider  and
D.R. Rolison
R.M. Stroud
Affiliation:
Naval Research Laboratory, Washington, DC 20375
E. Carpenter
Affiliation:
Naval Research Laboratory, Washington, DC 20375
V.M. Browning
Affiliation:
Naval Research Laboratory, Washington, DC 20375
J.W. Long
Affiliation:
Naval Research Laboratory, Washington, DC 20375
K.E. Swider
Affiliation:
Naval Research Laboratory, Washington, DC 20375
D.R. Rolison
Affiliation:
Naval Research Laboratory, Washington, DC 20375
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Abstract

The structure and magnetic properties of sol-gel-synthesized, nanocrystalline KσMnO2 were investigated. The nanoparticles were determined by x-ray diffraction and high-resolution transmission electron microscopy to be single-crystal rods of the cryptomelane phase of MnO2, with a typical particle size of 6 nm × 20 nm. The field and temperature dependence of the magnetization indicates superparamagnetic behavior, with a blocking temperature of 15K. The dependence of the magnetic properties on particle size, surface layers and mixed valency is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 283
Copyright
Copyright © Materials Research Society 2000

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