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Ordering in Lithium and Sodium Inserted W18O49

Published online by Cambridge University Press:  15 February 2011

A. Martinez De La Cruz ,
Leticia M. Torres-Martinez ,
F. Garcia-Alvarado ,
E. Moran  and
M. A. Alario-Franco
A. Martinez De La Cruz
Affiliation:
Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Apartado Postal 1864, Monterrey, N.L., MEXICO.
Leticia M. Torres-Martinez
Affiliation:
Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Apartado Postal 1864, Monterrey, N.L., MEXICO.
F. Garcia-Alvarado
Affiliation:
Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo-CEU, Urb. Montepríncipe, Apd. Correos 67, Boadilla del Monte, Madrid, SPAIN.
E. Moran
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid 28040, SPAIN.
M. A. Alario-Franco
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid 28040, SPAIN.
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Abstract

The insertion of alkali metals in W18O49 is governed by size of the cations. In this way, lithium insertion ( rVI = 0.76 Å ) seems to be optimal and a maximum of 23.5 lithium per formula can be reached before the irreversible reduction of W18O49. On the other hand, when sodium is inserted ( rVI = 1.02 Å ) an order of magnitude decrease in the amount inserted is observed and a maximum of only 1.8 sodium per formula can be intercalated. On the basis of the different phases that we have previously detected by electrochemical methods in the Li / W18O49 and Na / W18O49 systems, we have started a structural characterization by electron diffraction techniques. These studies have revealed some lithium and sodium ordering states for certain compositions; this can be explained taking into account the different types of tunnels present in W18O49.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 65
Copyright
Copyright © Materials Research Society 1997

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References

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