The reduction of tungsten and molybdenum oxide compounds (WO3, MoO3, MgWO4, MgMoO4, and CaMoO4) with calcium vapor at 800–860°С and a residual argon pressure of 5–10 kPa has been studied. As previously during the reduction with magnesium vapor, the spatial separation of the reaction products was observed, namely, the major portion of the calcium oxide formed in the reaction was deposited outside the reaction zone. A specific feature of the reduction of MgWO4 and MgMoO4 is that the magnesium is first replaced by calcium. The resulting magnesium metal acts as a reducing agent, and the magnesium oxide, along with calcium oxide, forms a crust on the surface of the reaction mass. Analysis of the experimental results shows that the reduction of oxide compounds with magnesium and calcium vapors at a residual argon pressure of more than 5 kPa proceeds via the electronically mediated reaction mechanism without direct physical contact between the reactants.

中文翻译：

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钼和氧化钨化合物金属热还原中的电子介导反应

已经研究了在 800–860°С 和 5–10 kPa 的残余氩压力下用钙蒸气还原钨和钼氧化物化合物（WO3、MoO3、MgWO4、MgMoO4 和 CaMoO4）。如前所述，在用镁蒸气还原期间，观察到反应产物的空间分离，即反应中形成的大部分氧化钙沉积在反应区外。MgWO4 和MgMoO4 还原的一个具体特征是镁首先被钙取代。所得金属镁充当还原剂，氧化镁与氧化钙一起在反应物质的表面形成外壳。