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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Hydrothermal Synthesis and Electromagnetic Characteristics of α-MnO2 Nanorods
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 1235-1239)
Author(s): Fu-xue Yan, Advanced Material Analysis and Test Center, Xi’an University of Technology, Xi’an, China
Gao-yang Zhao, School of Material Science and Engineering, Xi’an University of Technology，Xi’an，China
He-guang Liu, School of Material Science and Engineering, Xi’an University of Technology，Xi’an，China
Abstract: α-MnO2 nanorods were prepared with hydrothermal method using manganese sulfate (MnSO4·H2O) and potassium permanganate (KMnO4) as raw materials in a stainless-steel autoclave at 160 oC for 48 h. The crystalline structure, morphology and microstructure of the products were characterized by XRD, FESEM and TEM. The temperature dependent dielectric properties in the frequency ranges 1 kHz to 1 MHz were also discussed at the temperature 223 K to 393K. The results show that the products are tetragonal α-MnO2 nanorods with straight and smooth surfaces. Its diameter is about 30 nm and lengths are up to 0.5–1 μm. The dielectric constants and dielectric loss tangents all increase with temperature and decrease with frequency. With the decreasing of temperature, there turns less difference between the dielectric loss tangents at different frequencies.
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