Role of nanocrystallinity on the chemical ordering of Co<sub>x</sub>Pt<sub>100-x</sub> nanocrystals synthesized by wet chemistry [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 28,162-28,170 : digital, PDF file
- Additional Creators:
- Brookhaven National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Co<sub>x</sub>Pt<sub>100–x</sub> nanoalloys have been synthesized by two different chemical processes either at high or at low temperature. Their physical properties and the order/disorder phase transition induced by annealing have been investigated depending on the route of synthesis. It is demonstrated that the chemical synthesis at high temperature allows stabilization of the fcc structure of the native nanoalloys while the soft chemical approach yields mainly poly or non crystalline structure. As a result the approach of the order/disorder phase transition is strongly modified as observed by high-resolution transmission electron microscopy (HR-TEM) studies performed during <i>in situ</i> annealing of the different nanoalloys. The control of the nanocrystallinity leads to significant decrease in the chemical ordering temperature as the ordered structure is observed at temperatures as low as 420 °C. Furthermore, this in turn preserves the individual nanocrystals and prevents their coalescence usually observed during the annealing necessary for the transition to an ordered phase.
- Published through SciTech Connect., 03/17/2015., "bnl--111682-2015-ja", "KC0403020", Physical Chemistry Chemical Physics. PCCP (Print) 17 42 ISSN 1463-9076; PPCPFQ AM, and Marco Cordeiro; Farid Kameche; Anh -Tu Ngo; Caroline Salzemann; Eli Sutter; Christophe Petit.
- Funding Information:
View MARC record | catkey: 24094474