Hydration, Structure, and Superconductivity of KOs2O6·nH2O

Galati, R. (author)

Simon, C. (author): Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry

Knee, Christopher, 1973 (author): Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry,University of Gothenburg

Henry, P. F. (author)

Rainford, B. D. (author)

Weller, M. T. (author)

(creator_code:org_t)

2008-01-19
2008
English.
In: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 20:4, s. 1652-1659

Related links:: http://dx.doi.org/10...; show more...; https://gup.ub.gu.se...; https://doi.org/10.1...; https://research.cha...; show less...

Abstract Subject headings

In moist air or by contact with water during washing, KOs2O6 absorbs water molecules into the structure to produce KOs2O6·nH2O, 0 < n < 0.1. This water is reversibly lost on heating above ∼430 K in flowing or static gas environments. Variable temperature powder neutron and X-ray diffraction show that an increase in lattice parameter occurs when water enters the pyrochlore structure and the water molecules are located in the α cages displacing a portion of the potassium ions to adjacent sites. On removing water the lattice parameter and structure revert to those of the normal β-pyrochlore crystallographic description. Hydration has the effect of reducing the onset of superconducting behavior from a critical temperature of 10.25 K in fully dry KOs2O6 to 9.75 K in KOs2O6·0.1H2O.

By the author/editor: Galati, R.; Simon, C.; Knee, Christophe ...; Henry, P. F.; Rainford, B. D.; Weller, M. T.

About the subject

By the university: University of Gothenburg; Chalmers University of Technology

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