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Indexed by:期刊论文

Date of Publication:2010-09-15

Journal:JOURNAL OF CRYSTAL GROWTH

Included Journals:SCIE、EI、Scopus

Volume:312

Issue:19

Page Number:2788-2794

ISSN No.:0022-0248

Key Words:Electromagneticroperties; High magnetic field; MnO2; Morphology

Abstract:MnO2 powder was synthesized in a high magnetic field (8 T) via a simple route, and the formation mechanism for the grain shape was discussed. The synthesized samples were characterized by XRD, SEM, TEM, and vector network analysis. The morphology of synthesized MnO2 was sea urchin-like ball chain with a low density center, just like "hollow-like". Throughout the whole frequency range, the dielectric constant and the loss tangent clearly decreased in 8 T high magnetic field. Moreover, the magnetic permeability and the loss tangent increased slightly in the frequency range 2-13 GHz. Furthermore, the theoretically calculated values of reflection loss showed that when the magnetic field strength 8 T was adopted, the absorption peak became smoother and shifted to a higher frequency. (C) 2010 Elsevier B.V. All rights reserved.