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Indexed by:期刊论文

Date of Publication:2012-03-15

Journal:PHYSICA B-CONDENSED MATTER

Included Journals:SCIE、EI

Volume:407

Issue:6

Page Number:971-977

ISSN No.:0921-4526

Key Words:Manganese oxides; Chemical synthesis; Fe-doping; Hollow structure; Electromagnetic properties

Abstract:A simple wet chemical method was used to synthesize Fe-doped MnO2 composites with iron amount ranging from 0 to 90 M percent. X-ray diffraction, electron probe micro-analyzer, scanning electron microscopy and vector network analyzer were employed to investigate the effect of iron doping on the microstructure and electromagnetic performance of the as-synthesized samples. Results indicate that relative small content of Fe-doping cannot change the alpha-MnO2 structure but can promote the formation of hollow-structural morphology. The as-obtained products are transformed into a novel compound (Fe0.67Mn0.33)OOH with the increase of Fe-doping to 30 mol%. The possible formation mechanism was proposed in detail. Compared with the pure MnO2, the Fe-doped samples exhibit decreased dielectric loss but increased magnetic loss with increasing the iron content below 20 mol% while relatively poor electromagnetic properties with the iron content above 30 mol%. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.