Synthesis of hydrogen tungsten bronzes HxWO3 by reactive mechanical milling of hexagonal WO3
Synthesis of hydrogen tungsten bronzes HxWO3 by reactive mechanical milling of hexagonal WO3
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DOI：
10.1016/j.jallcom.2009.10.109
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发表时间：
2010-04
影响因子：
6.2
通讯作者：
F. Castro;F. Tonus;J. Bobet;G. Urretavizcaya
中科院分区：
文献类型：
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作者：
F. Castro;F. Tonus;J. Bobet;G. Urretavizcaya
最近，我们报道了在氢气气氛下通过反应机械研磨单斜氧化钨（VI）形成氢钨青铜。在这项工作中，我们报道了在氢气气氛下铣削六方WO3。我们的主要结果是六方氧化物向具有斜方结构的WO3高温多晶型物的结构转变，以及在不同球磨时间下形成不同的氢钨青铜。该青铜似乎是由斜方晶系氧化物形成的，与通过铣削单斜晶系WO3获得的青铜相比，在短暂暴露于空气中后相当不稳定。通过X射线衍射(XRD)、差示扫描量热法(DSC)和总氢含量测定对材料进行表征。
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 WO3under H2atmosphere. Our main results are the structural transformation of the hexagonal oxide to the high temperature polymorph of WO3with 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 WO3are 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.