Digitale Medien
Springer
Journal of thermal analysis and calorimetry
54 (1998), S. 815-824
ISSN:
1572-8943
Schlagwort(e):
oxygen indexes
;
structure
;
thermoanalysis
;
β-tungsten
;
WO3reduction
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The aim of the present work was to provide arguments to the almost ‘hystorical’ problem of what β-tungsten is. WO3was reduced in dry H2gas atmosphere in order to examine, whether β-tungsten formed in such a way contains oxygen as part of the lattice described as WxO (e.g. W20O) or is a pure metallic phase of tungsten. As a result of thermoanalytical measurements and of chemical analysis for oxygen, the assumption is supported that in the 600-800°C temperature range of metal formation not the WxO (β-W)→W(α-W) transformation but the β-W→α-W structural rearrangement of materials with identical chemical composition is the most probable process. The earlier opinion that the formation of the β-W structure requires the presence of oxygen atoms was not verified by our results.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1010143904328
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