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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/23477

Title: Characterization of Nanocrystalline Manganese Oxide Powder Prepared by Inert Gas Condensation
Authors: Chin-Yi Chen;Chung-Kwei Lin;Ming-Hsiu Tsai;Chien-Yie Tsay;Pee-Yew Lee;Giin-Shan Chen
Contributors: NTOU:Institute of Materials Engineering
Keywords: B. X-ray methods;C. Thermal properties;Gas phase reaction;Manganeseoxide;In situ synchrotron X-ray diffractometry
Date: 2008-09
Issue Date: 2011-10-20T08:06:22Z
Publisher: Ceramics International
Abstract: Abstract:Nanocrystallinemanganeseoxidepowders were synthesized by an inertgascondensation technique. The manganeseoxidepowders, prepared from vaporized metallic manganese in a helium pressure of 10 mbar, then oxidized under the oxygen pressures of 50 and 100 mbar, exhibited a mixture of β-Mn, MnO and Mn3O4 phases. X-ray diffractometry (XRD) analysis identified the predominant oxide formation of the as-preparedpowder to be the phase of MnO. In situ synchrotron XRD and differential scanning calorimetry (DSC) data showed that synthesized manganesepowder converts from β-Mn to MnO in the temperature range of 150–250 °C and subsequently converts to Mn3O4 above 250 °C. Transmission electron microscopy examinations confirmed that oxidation starts from the surface of the condensed β-Mn particles. Detailed valance variations of manganese of the resulting powders were investigated by synchrotron X-ray absorption spectroscopy techniques.
Relation: 34(7), pp.1661-1666
URI: http://ntour.ntou.edu.tw/handle/987654321/23477
Appears in Collections:[材料工程研究所] 期刊論文

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