A correlation between thermodynamic properties, thermal expansion and electrical resistivity of Ag-28% Cu nanopowders processed by the mechanical alloying route

作者：Tanasescu Speranta; Milea Alexandru; Gingu Oana; Maxim Florentina; Hornoiu Cristian; Preda Silviu; Sima Gabriela

来源：Physical Chemistry Chemical Physics, 2015, 17(42): 28322-28330.

DOI：10.1039/c5cp01390a

Thermodynamic properties, thermal expansion and electrical resistivity of the Ag-28% Cu nanopowders processed by the mechanical alloying route have been investigated in the temperature range from ambient to 1048 K. The thermodynamic properties represented by the relative enthalpy, the specific heat capacity, the relative entropy and the Gibbs energy function obtained from drop calorimetric measurements have been used to reveal the occurrence of the micro-relaxation process, as well as of the correlative effects of decomposition and growth processes. On the basis of the results, the parameters that favour stable nanostructured systems in Ag-28% Cu powders synthesized by the mechanical alloying route have been identified. The correlation of the energetic parameters with thermal expansion and electrical resistivity in mechanical alloyed nanocrystalline powders with the eutectic composition is discussed.

• 出版日期2015