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论文类型：期刊论文

发表时间：2010-07-01

发表刊物：JOURNAL OF SOLID STATE CHEMISTRY

收录刊物：SCIE、EI

卷号：183

期号：7

页面范围：1490-1495

ISSN号：0022-4596

关键字：Manganese dioxides; High magnetic field; Chain shape; Electromagnetic properties

摘要：MnO2 with a sea urchin-like ball chain shape was first synthesized in a high magnetic field via a simple chemical process, and a mechanism for the formation of this grain shape was discussed. The as-synthesized samples were characterized by XRD, SEM, TEM, and vector network analysis. The dielectric constant and the loss tangent clearly decreased under a magnetic field. The magnetic loss tangent and the imaginary part of the magnetic permeability increased substantially. Furthermore, the theoretically calculated values of reflection loss showed that the absorption peaks shifted to a higher frequency with increases in the magnetic field strength. (C) 2010 Elsevier Inc. All rights reserved.