Journal
MATERIALS CHARACTERIZATION
Volume 61, Issue 11, Pages 1135-1146Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2010.07.006
Keywords
Cu-Ni alloy; Nanostructure; Chemical synthesis; Mechanical mixture
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Funding
- Universidad Nacional de San Luis
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Fondo para la Investigacion Cientifica y Tecnologica (FONCyT), Argentina
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Mixtures of CuO and NiO were prepared by two different techniques and then the oxides were reduced with H-2 Method A involved the preparation of mechanical mixtures of CuO and NiO using different milling and pelletizing processes Method B involved the chemical synthesis of the mixture of CuO and NiO The route used to prepare the copper and nickel oxide mixture was found to have great influence on the characteristics of bimetallic Cu-Ni particles obtained Observations performed using the X ray diffraction (XRD) technique showed that although both methods led to the Cu-Ni solid solution the diffractogram of the alloy obtained with method A revealed the presence of NiO together with the alloy The temperature programmed reduction (TPR) experiments indicated that the alloy is formed at lower temperatures when using method B The scanning electron microscopy (SEM) studies revealed notable differences in the morphology and size distribution of the bimetallic particles synthesized by different routes The results of the electron probe microanalysis (EPMA) studies evidenced the existence of a small amount of oxygen in both cases and demonstrated that the alloy synthesized using method B presented a homogeneous composition with a Cu-Ni ratio close to 1 1 On the contrary the alloy obtained using method A was not homogeneous in all the volume of the solid The homogeneity depended on the mechanical treatment undergone by the mixture of the oxides (C) 2010 Elsevier Inc All rights reserved
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