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Phase Transformations in physical mixtures of Pd-Cu nanoparticles

Published online by Cambridge University Press:  14 March 2013

Vineetha Mukundan ,
Jun Yin ,
Chuan-Jian Zhong  and
Oana Malis
Vineetha Mukundan
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907, USA
Jun Yin
Affiliation:
Department of Chemistry, SUNY Binghamton, NY 13902, USA
Chuan-Jian Zhong
Affiliation:
Department of Chemistry, SUNY Binghamton, NY 13902, USA
Oana Malis
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907, USA
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Abstract

The temperature induced structural transformations in physical mixtures of 1nm palladium and ultrafine (∼0.5nm) copper nanoparticles supported on carbon were studied using in-situ real time synchrotron based x-ray diffraction. These nanoparticles were subjected to two-step thermal annealing from 25°C to 700°C. The Pd and Cu nanoparticles were found to coalesce forming alloy nanoparticles that subsequently undergo a structural phase transformation from ordered B2 to disordered fcc. The random alloy formed at the end of the thermal treatments was found to be copper-rich.

Keywords

nanostructurex-ray diffraction (XRD)phase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1528: Symposium VV – Advanced Materials Exploration with Neutrons and Synchrotron X-Rays , 2013 , mrsf12-1528-vv12-04
Copyright
Copyright © Materials Research Society 2013

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