Hydration, structure, and superconductivity of KOs2O6·nH2O

Rosa Galati, Charles Simon, Christopher S. Knee, Paul F. Henry, Brian D. Rainford, Mark T. Weller

Research output: Contribution to journalArticlepeer-review

10 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)1652-1659
Number of pages8
JournalChemistry of Materials
Issue number4
Early online date19 Jan 2008
Publication statusPublished - 26 Feb 2008


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