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Introduction to description of phase diagram of solid wüstite: I. Structural evidence of allotropic varieties

Authors
Journal
Materials Research Bulletin
0025-5408
Publisher
Elsevier
Publication Date
Volume
11
Issue
6
Identifiers
DOI: 10.1016/0025-5408(76)90154-9
Disciplines
  • Earth Science
  • Physics

Abstract

Abstract The stability field of solid wüstite has been the subject of many thermodynamic and structural investigations. These reveal three varieties - W 1, W 2 and W 3 - above 911°C and three other varieties - W′ 1, W′ 2 and W′ 3 - below this temperature. A statistical analysis of our measurements, and of those found in recent literature, of the lattice parameter of wüstite as a function of composition and temperature confirms the existence of the three high-temperature varieties. A dilatometric study leads to the same conclusion. A similar analysis could be made for the three other varieties before studying their structure, but their existence has already been directly evidenced by thermogravimetric and structural investigations.

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