Article ID Journal Published Year Pages File Type
1333626 Journal of Solid State Chemistry 2006 9 Pages PDF
Abstract

A temperature dependent electron diffraction study has been carried out on UAsSe to search for evidence of As–As dimerization at low temperature. A highly structured characteristic diffuse intensity distribution, closely related to that recently reported for ThAsSe, has been observed at low temperature and interpreted in terms of a gradual charge density wave type phase transition upon lowering of temperature involving disordered As–As dimerization within (001) planes. Plausible models of the proposed As–As dimerization have been obtained using a group theoretical approach. Electronic band structure calculations of ThAsSe and UAsSe have been used to search for potential Fermi surface nesting wave-vectors. The results are in good agreement with the experimentally observed diffuse intensity distributions in both cases.

Graphical abstractA typical 〈001〉 zone axis EDP of UAsSe taken at ∼80–90 K. In addition to the strong Bragg reflections of the underlying P4/nmm average structure, note the presence of a highly structured characteristic diffuse intensity distribution arising from disordered As–As dimerization.Figure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemistry Inorganic Chemistry
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