Abstract:
In this study, the contribution of phonon to the thermal conductivity in the In-Bi (Indium-Bismuth) system
due to its composition variation was determined from their electrical and thermal conductivity measurements. Because
of the common usage of In-Bi system in many technological applications, thermal and electrical conductivity
variations with temperature for different compositions of Bi component were measured. Four-Point Probe (FPP) and
Linear Heat-Flow (LHF) methods were used for electrical and thermal conductivity measurements respectively.
Intermetallic systems' electrical conductivity values were determined between 0.8524 (1/Ω m) ×106
and 2.8381(1/Ω
m) ×106
and thermal conductivity values were found between 14.50 (W/Km) and 35.93 (W/Km) at the melting
temperature. Electron and phonon contributions to the thermal conductivity were calculated by using Wiedemann Franz Law (WFL) from the measured values. The temperature coefficients values () of electrical and thermal
conductivity were calculated between 0.46-2.54 (K-1
) x10-3
and 1.29-4.34 (K-1
) x10-3 respectively. In order to observe
microstructure of the Bi-In intermetallic alloy Scanning Electron Microscopy (SEM) and to determine the
composition of the phases in the structures, Energy Dispersive X-Ray Analysis (EDX) were used. Also melting
temperatures (349.03 K-387.24 K), enthalpy of fusion (17.97 J/g- 42.37 J/g) and specific heat change (0.159 J/gK 0.372 J/gK) of Bi-In alloy systems were measured by using Differential Scanning Calorimeter (DSC)