Crystal structure of the superconducting layered cobaltate NaxCoO2·yD2O

Autor:	Neil D. Mathur, Laurent Chapon, A. Chemseddine, N. Aliouane, Paolo G. Radaelli, Susan Cox, Paul A. Midgley, Dimitri N. Argyriou, J. Veira, C. J. Milne
Rok vydání:	2005
Předmět:	Superconductivity Range (particle radiation) Materials science Condensed matter physics Rietveld refinement Neutron diffraction Crystal structure Condensed Matter Physics Crystallography Electron diffraction Condensed Matter::Superconductivity General Materials Science Neutron Solid solution
Zdroj:	Journal of Physics: Condensed Matter. 17:3293-3304
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/17/21/022
Popis:	We have used electron diffraction and neutron powder diffraction to elucidate the structural properties of superconducting NaxCoO 2•yD2O over a wide compositional range. Our measurements show that superconducting samples exhibit a number of supercells ranging from to , but the predominant modulation, observed also in the neutron data, is a double hexagonal cell with dimensions 2a × 2a × c. Rietveld analysis reveals that D2O is inserted between CoO 2 sheets to form a layered network of NaO6 triangular prisms. Our model removes the need to invoke a 5 K superconducting point compound and suggests that a solid solution of Na is possible within a relatively constant amount of water y. © IOP Publishing Ltd.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88da98700a0fd024ff1f791b7a5dd353 https://doi.org/10.1088/0953-8984/17/21/022 Zobrazit plný text záznamu