Abstract
Internal defects and strain in nanoparticles can influence their properties and thereforemeasuring these values is relevant. Powder diffraction techniques (neutron andsynchrotron) are successfully used to characterize internal strain in the core–shellNi3Si(Al)–SiOx nanoparticles havingmean diameters of ∼80 nm. The nanoparticles, which are strain-free after extraction from the bulkalloys, develop internal strain on heating. Both micro- and macro-strains can bemeasured from the analysis of Bragg peak shift and broadening. It is identifiedthat differences in thermal expansion coefficient of the metallic core and theamorphous shell of the nanoparticles, as well as partial disordering of theL12 ordered core phase, are the main causes of strain evolution. Synchrotron measurements alsodetected partial crystallization of the amorphous silica shell.
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