Solid state deoxygenation of vanadium
1981; Elsevier BV; Volume: 81; Issue: 2 Linguagem: Inglês
10.1016/0022-5088(81)90030-8
ISSN1878-2728
AutoresO. Yoshinari, T. Konno, K. K. Suma, M. Koiwa,
Tópico(s)Catalysis and Oxidation Reactions
ResumoAbstract The deoxygenation of vanadium wires was attempted by annealing in contact with metals having a higher affinity than vanadium for oxygen. The metals titanium and zirconium were in the form of thin foils, whereas calcium, aluminium and magnesium were in the form of granules or small blocks. The vanadium specimens were sealed with deoxidizers in evacuated quartz tubes and annealed at temperatures between 900 and 1200 °C. The oxygen contents were estimated from the Snoek peak height of the internal friction. Both the titanium and the zirconium treatments yielded successful results. It was found that calcium atoms diffuse into vanadium to form complexes with oxygen; these complexes decomposed reversibly and formed on thermal cycling at temperatures lower than 900 °C.
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