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Science 9 August 2002:
Vol. 297. no. 5583, pp. 996 - 998
DOI: 10.1126/science.1073979
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Reports
A General Synthetic Procedure for Heteropolyniobates
May Nyman,*
François Bonhomme,
Todd M. Alam,
Mark A. Rodriguez,
Brian R. Cherry,
James L. Krumhansl,
Tina M. Nenoff,
Amy M. Sattler
The heteropolyanions of W, Mo, and V, which have found numerous
applications, are formed simply by acidification of solutions of their
oxoanions. Under similar conditions, these oxoanion precursors are not
available for Nb, and Nb-oxo chemistry is dominated by formation of the
Lindquist ion [Nb6O19]8- only.
However, heteropolyniobate formation is favored in hydrothermal reactions of aqueous, alkaline precursor mixtures. Here we give two
examples of heteropolyniobates formed by this general reaction type:
K12[Ti2O2][SiNb12O40]·16H2O
[1], which contains chains of silicododecaniobate Keggin ions, and
Na14[H2Si4Nb16O56]·45.5H2O [], a new heteropolyanion structure type.
Sandia National Laboratories, Albuquerque, NM 87185, USA.
*
To whom correspondence should be addressed. E-mail:
mdnyman{at}sandia.gov
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Menezesite, the first natural heteropolyniobate, from Cajati, Sao Paulo, Brazil: Description and crystal structure.
- D. Atencio, J. M.V. Coutinho, A. C. Doriguetto, Y. P. Mascarenhas, J. Ellena, and V. C. Ferrari (2008)
American Mineralogist
93, 81-87
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- Mineralogy and crystal structure of bouazzerite from Bou Azzer, Anti-Atlas, Morocco: Bi-As-Fe nanoclusters containing Fe3+ in trigonal prismatic coordination.
- J. Brugger, N. Meisser, S. Krivovichev, T. Armbruster, and G. Favreau (2007)
American Mineralogist
92, 1630-1639
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