Journal
MATERIALS CHARACTERIZATION
Volume 112, Issue -, Pages 206-212Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.12.024
Keywords
Manganese dioxide; Electromagnetic property; Rectangular pyramid
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Funding
- National Natural Science Foundation of China [51577021]
- Program for New Century Excellent Talents in University [NCET-13-0071]
- Fundamental Research Funds for the Central Universities [DUT14YQ201]
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beta-MnO2 microncube is a novel morphology of microncube with rectangular pyramid. It has been synthesized for the first time via a simple aqueous chemical route under hydrothermal conditions without any templates. When the reaction time is increased from 1 h to 10 h, the crystal type changed from gamma-MnO2 to beta-MnO2 and the morphology changed from an urchin-like shape to a microncube with rectangular pyramid. We propose a possible growth mechanism for intrinsic structural growth mechanism, the evolution process of the beta-MnO2 structure is proposed to involve two main stages. Besides, the electromagnetic properties of the synthesized beta-MnO2 were investigated. It shows that beta-MnO2 has certain dielectric loss properties and an effective absorption bandwidth (reflection loss lower than - 10 dB) of 3.5 GHz was achieved from the beta-MnO2/paraffin wax composite. (C) 2015 Elsevier Inc. All rights reserved.
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