Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 495, Issue 2, Pages 537-540Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.10.109
Keywords
Hydrogen tungsten bronzes; Mechanical alloying; Hydrogen absorbing materials
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Recently, we have reported the formation of hydrogen tungsten bronzes by reactive mechanical milling monoclinic tungsten (VI) oxide under hydrogen atmosphere In this work we report the milling of hexagonal WO3 under H-2 atmosphere Our main results are the structural transformation of the hexagonal oxide to the high temperature polymorph of WO3 with orthorhombic structure, and the formation of different hydrogen tungsten bronzes at distinct milling times. The bronzes seem to be formed from the orthorhombic oxide, and compared with the bronzes obtained by milling monoclinic WO3 are rather unstable after short exposure to air The materials are characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and total hydrogen content determination. (C) 2009 Elsevier B.V All rights reserved
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