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首页> 外文期刊>Crystallography reports >Molybdenum and tungsten combined oxidation by dissociative evaporation of products during refractory oxides crystal growth from the melt
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Molybdenum and tungsten combined oxidation by dissociative evaporation of products during refractory oxides crystal growth from the melt

机译:难熔氧化物晶体从熔体中生长过程中,钼和钨通过产物的离解蒸发而结合氧化

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摘要

The main chemical reactions and composition of gas and solid phases have been determined for the equimolar ratio Mo: W: O_2 = 1: 1: 2 at T = 2400 K in the pressure range of 1-1 x 10~(-5) bar. It is established that the character of the main processes of combined oxidation depends significantly on the pressure and state of the oxidant (oxygen): at P > 7.52 x 10~(-5) bar, oxidation reactions involve mainly molecular oxygen, whereas atomic oxygen dominates at lower pressures. At P ≥ 0.424 bar, the solid phase contains not only Mo but also MoO_2. At P = 1 x 10 ~(-5) bar, the concentration of lower Mo and W oxides and elementary Mo and W in the gas phase sharply increases, which can negatively affect the main crystallization units.
机译:在1-1 x 10〜(-5)bar的压力范围内,当T = 2400 K时,等摩尔比Mo:W:O_2 = 1:1:2时,已确定了气相和固相的主要化学反应和组成。可以确定,复合氧化的主要过程的特性很大程度上取决于氧化剂(氧气)的压力和状态:在P> 7.52 x 10〜(-5)bar时,氧化反应主要涉及分子氧,而原子氧在较低的压力下占主导地位。在P≥0.424 bar时,固相不仅包含Mo,而且包含MoO_2。在P = 1 x 10〜(-5)bar时,气相中较低的Mo和W氧化物以及元素Mo和W的浓度急剧增加,这会对主要的结晶单元产生负面影响。

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