Soft mode anisotropy in negative thermal expansion material ReO$_3$
Tobias A. Bird,
Mark G. L. Wilkinson,
David A. Keen
et al.
Abstract:We use a symmetry-motivated approach to analyse neutron pair distribution function data to investigate the mechanism of negative thermal expansion (NTE) in ReO3. This analysis shows that the local structure of ReO3 is dominated by an in-phase octahedral tilting mode and that the octahedral units are far less flexible to scissoring type deformations than the octahedra in the related compound ScF3. These results support the idea that structural flexibility is an important factor in NTE materials, allowing the ph… Show more
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