Abstract

We report the synthesis of MnO2-delta microspheres using hydrothermal and conventional chemical reaction methods. The microspheres of MnO2-delta consist of nanowires having a diameter of 20-50 nm and a length of 2-8 µm. The value of oxygen vacancy delta estimated from x-ray photoelectron spectrum is 0.3. The magnetization versus temperature curve indicates a magnetic transition at about 13 K. It is found that a parasitic ferromagnetic component is imposed on the antiferromagnetic structure of MnO2-delta, which might result from distortion of the lattice structure due to oxygen vacancies. The magnetic transition temperature TN is about 10 K lower than that of the bulk MnO2 single crystal.

Department(s)

Materials Science and Engineering

Second Department

Chemistry

Sponsor(s)

United States. Department of Energy

Keywords and Phrases

X-Ray Photoelectron Spectra; Ferromagnetic Materials; Liquid Phase Deposition; Magnetic Transition Temperature; Magnetisation; Manganese Compounds; Micromagnetics; Nanowires; Surface Morphology

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2004 American Institute of Physics (AIP), All rights reserved.

Full Text Link

Included in

Chemistry Commons

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