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Structural and mechanistic inferences in the mechanochemical synthesis of nanostructured Ni-Sn and Co- Sn alloys

Mulas, Gabriele Raimondo Celestino and Delogu, Francesco and Enzo, Stefano and Bonatto Minella, Christian (2009) Structural and mechanistic inferences in the mechanochemical synthesis of nanostructured Ni-Sn and Co- Sn alloys. Journal of Physics: Conference Series, Vol. 144 (1), 012025. eISSN 1742-6596. Article.

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DOI: 10.1088/1742-6596/144/1/012025

Abstract

We focus on the synthetic path of nanostructured Ni-Sn and Co-Sn systems by mechanical alloying. A similar reaction path seems to characterize the process for both the systems: the formation of intermediate, metastable, Sn rich phases has been evidenced, not provided for by the corresponding equilibrium phase diagrams. Their crystallographic and thermodynamic properties were evaluated through a structural and calorimetric investigation. Further mechanical processing induced structural evolutions by the progressive alloys enrichment in Ni and Co respectively, according to the stoichiometric constraints. Quantitative assessment of relative abundance of crystallographic phases let us investigate the alloying kinetics. By resorting to a previously developed procedure we evaluated collision frequency and impact energy. Then the analytical solution of the kinetic curves allowed us to relate the conversion degree to the effective collisions undergone by each powder particle.

Item Type:Article
ID Code:6422
Status:Published
Refereed:Yes
Uncontrolled Keywords:NI-SN synthetic process, nanostructured materials
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:IOP Publishing
eISSN:1742-6596
Copyright Holders:© 2009 IOP Publishing
Additional Information:Issue on the 13th International Conference on Rapidly quenched and metastable materials, 24–29 August 2008, Dresden, Germany
Deposited On:30 Aug 2011 09:09

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