Negative thermal expansion in a large molybdate and tungstate family
Journal Article
·
· Journal of Solid State Chemistry
- Oregon State Univ., Corvallis, OR (United States)
Negative thermal expansion has been discovered in a very large family of oxides represented by the formula A{sub 2}M{sub 3}O{sub 12}, where the A and M cations are coordinated by oxygen octahedrally and tetrahedrally, respectively. In the case of Sc{sub 2}W{sub 3}O{sub 12} negative thermal expansion occurs over a temperature range of at least 10 to 1200 K. Ceramic bars of Sc{sub 2}W{sub 3}O{sub 12} show a contraction with increasing temperature greater than that reported for any other material. Trends observed in this large A{sub 2}M{sub 3}O{sub 12} family have provided insights on why many compounds showing negative thermal expansion cease to show this behavior below a certain temperature. Some members of this family show positive thermal expansion. Solid solutions have been made which show very low thermal expansion.
- OSTI ID:
- 613723
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 133; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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