Heat-induced spinodal decomposition of Ag–Cu nanoparticles

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Authors

SOPOUŠEK Jiří ZOBAČ Ondřej BURŠÍK Jiří ROUPCOVÁ Pavla VYKOUKAL Vít BROŽ Pavel PINKAS Jiří VŘEŠŤÁL Jan

Year of publication 2015
Type Article in Periodical
Magazine / Source PHYSICAL CHEMISTRY CHEMICAL PHYSICS
MU Faculty or unit

Faculty of Science

Citation
Web J. Sopousek, et all: Heat-induced spinodal decomposition of Ag–Cu nanoparticles
Doi http://dx.doi.org/10.1039/c5cp00198f
Field Solid matter physics and magnetism
Keywords Nanoparticle synthesis; alloy; CALPHAD; XRD
Attached files
Description Solvothermal synthesis was used for Ag–Cu nanoparticle (NP) preparation from metallo-organic precursors. The detailed NP characterization was performed to obtain information about nanoparticle microstructure and both phase and chemical compositions. The resulting nanoparticles exhibited chemical composition inside a FCC_Ag + FCC_Cu two-phase region. The microstructure study was performed by various methods of electron microscopy including high-resolution transmission electron microscopy (HRTEM) at an atomic scale. The HRTEM and X-ray diffraction studies showed that the prepared nanoparticles form the face centred cubic (FCC) crystal lattice where the silver atoms are randomly mixed with copper. The CALPHAD approach was used for predicting the phase diagram of the Ag–Cu system in both macro- and nano-scales. The predicted spinodal decomposition of the metastable Ag–Cu nanoparticles was experimentally induced by heating on an X-ray powder diffractometer (HT XRD). The nucleation of the Cu-rich phase was detected and its growth was studied. Changes in the Ag-rich phase were observed in situ by X-ray diffraction under vacuum. The heat treatment was conducted at different maximum temperatures up to 450 °C and the resulting particle product was analysed. The experiments were complemented by differential scanning calorimetry (DSC) measurements up to liquidus temperature. The start temperatures of the spinodal phase transformation and particle aggregation were evaluated.
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