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Enhanced Negative Thermal Expansion in Lu2W3O12

✍ Scribed by P.M. Forster; A. Yokochi; A.W. Sleight

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 191 KB
Volume: 140
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1998.7967

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✦ Synopsis

Negative thermal expansion in the Sc 2 W 3 O 12 family has been pushed to much more pronounced values by substituting a large cation for Sc. X-ray diffraction measurements from 127 to 627°°C give a linear thermal expansion coefficient of ؊ 6.8؋10 ؊6 /°°C for Lu 2 W 3 O 12 compared to ؊2.2؋10 ؊6 /°°C for Sc 2 W 3 O 12 . Negative thermal expansion in this family is dependent on the rocking motions of polyhedra. However, polyhedra in this structure cannot rock without changing their shape. Larger cations expand the octahedra, reducing the oxygen-oxygen repulsions within the polyhedra. This facilitates the polyhedra shape changes necessary for the rocking motions required for negative thermal expansion.

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