Abstract
Finely dispersed metal powders have been obtained after chemical reduction of Ni and Co acetylacetonate by lithium aluminum hydride in tetrahydrofuran at low temperature. The Al/Ni and Al/Co stoichiometry of the as-reduced powders was 1.1 and 1.2, respectively. The structure and thermal stability of the as-reduced powders were affected by the temperature of reduction. For the NiAl powders it was found that the thermal treatment initially induces a separation of highly unstable Ni(Al) and Al(Ni) solid solutions, which subsequently react to give a single NiAl phase of cubic structure not reported in the equilibrium phase diagram. Conversely, the reduction of cobalt acetylacetonate directly gives a cubic metastable phase, from which precipitates some hexagonal form of Co after treatment at 450 °C.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Transformation of organometallics into common and exotic materials: design and activation, edited by R. M. Laine, NATO ASI Series No 141 (M. Nijhoff Pub., Dordrecht, 1988).
Solid state powder processing, A. H. Clauer and J.J. deBarbadillo (The Minerals, Metals and Materials Society, Warrendale, PA, 1990).
S. Davis and K.J. Klabunde, Chem. Rev. 82, 153 (1982).
(a) R. D. Rieke, Ace. Chem. Res. 10, 301 (1977).
(b) A. V. Kavaliunas, A. Taylor, and R. D. Rieke, Organometallics 2, 377 (1983).
(c) G. L. Rochfort and R. D. Rieke, Inorg. Chem. 25, 348 (1986).
R. C. Wade, J. Mol. Catal. 18, 273 (1983).
B. Ganem and J.O. Osby, Chem. Rev. 86, 763 (1986).
(a) A. Corrias, G. Ennas, G. Licheri, G. Marongiu, and G. Paschina, Chem. Mater. 2, 363 (1990).
(b) G. Carturan, S. Enzo, R. Ganzerla, M. Lenarda, and R. Zanoni, J. Chem. Soc. Faraday Trans. 86, 739 (1990).
J. O. Osby, S. W. Heinzman, and B. Ganem, J. Am. Chem. Soc. 108, 67 (1986).
A. Guinier, X-ray Diffraction (Freeman, San Francisco, CA, 1964).
M. J. Buerger, X-ray Crystallography (John Wiley & Sons, New York, 1966).
H.M. Rietveld, Aust. J. Phys. 41, 113 (1988).
Powder Diffraction File, Joint Committee on Powder Diffraction Standards, ASTM, Philadelphia, PA (1974), card nos. 4–787 and 4–850.
International Tables for X-ray Crystallography (Kynoch Press, Birmingham, U.K., 1974).
G. Cocco, S. Enzo, L. Schiffini, and L. Battezzati, New Materials by Mechanical Alloying Techniques, edited by E. Artz and L. Schultz (DGM-Verlag, 1989).
L. Brewer, J. Phys. Chem. 94, 1196 (1990).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lenarda, M., Ganzerla, R., Storaro, L. et al. Structural studies of Al-based powders prepared by chemical methods. Journal of Materials Research 7, 2418–2423 (1992). https://doi.org/10.1557/JMR.1992.2418
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.1992.2418