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Hydration, structure, and superconductivity of KOs2O6 center dot nH(2)O

Hydration, structure, and superconductivity of KOs2O6 center dot nH(2)O
Hydration, structure, and superconductivity of KOs2O6 center dot nH(2)O
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 ? 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 ?-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.
rbos2o6, kos2o6, pyrochlores
0897-4756
1652-1659
Galati, R.
ccdb5ce5-6771-46c2-ae68-8323413d7623
Simon, C.
02904d47-a311-44a0-9f95-362e92b3eb83
Knee, C.S.
d241249a-3d10-4b3e-9931-e3dd1029bb30
Henry, P.F.
7a749ff8-32f2-4075-9d7f-1852a62cf88e
Rainford, B.D.
0fdf537e-369d-46b4-98f2-b4f1812ca1aa
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Galati, R.
ccdb5ce5-6771-46c2-ae68-8323413d7623
Simon, C.
02904d47-a311-44a0-9f95-362e92b3eb83
Knee, C.S.
d241249a-3d10-4b3e-9931-e3dd1029bb30
Henry, P.F.
7a749ff8-32f2-4075-9d7f-1852a62cf88e
Rainford, B.D.
0fdf537e-369d-46b4-98f2-b4f1812ca1aa
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4

Galati, R., Simon, C., Knee, C.S., Henry, P.F., Rainford, B.D. and Weller, M.T. (2008) Hydration, structure, and superconductivity of KOs2O6 center dot nH(2)O. Chemistry of Materials, 20 (4), 1652-1659. (doi:10.1021/cm702972c).

Record type: Article

Abstract

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 ? 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 ?-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.

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More information

Submitted date: 21 November 2007
Published date: 2008
Keywords: rbos2o6, kos2o6, pyrochlores

Identifiers

Local EPrints ID: 54454
URI: http://eprints.soton.ac.uk/id/eprint/54454
ISSN: 0897-4756
PURE UUID: 606500a5-9f13-428e-9a8e-21e72f4b6ace

Catalogue record

Date deposited: 06 Aug 2008
Last modified: 13 Mar 2019 20:38

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