Thermal conductivity and interfacial energy of solid Bi in the Bi-Ag eutectic system
Abstract
The equilibrated grain boundary groove shapes
for solid Bi (Bi–2.87 at.%Ag) in equilibrium with Bi–Ag
eutectic liquid have been observed from quenched sample
with a radial heat flow apparatus. The Gibbs–Thomson
coefficient, solid–liquid interfacial energy and grain
boundary energy of solid Bi have been determined from the
observed grain boundary groove shapes. The variation of
thermal conductivity with temperature for eutectic solid
phase (Bi–4.7 at.%Ag) has been measured. The ratio of
thermal conductivity of equilibrated eutectic liquid phase
to eutectic solid phase has also been measured with a
Bridgman-type growth apparatus at the melting temperature. The Gibbs–Thomson coefficient, solid–liquid interfacial energy and grain boundary energy of solid Bi in
equilibrium with Bi–Ag eutectic liquid were determined to
be (9.2 ± 0.6) 9 10–8 K m, (52.7 ± 6.3) 9 10–3 J m–2
and (102.4 ± 13.3) 9 10–3 J m–2, respectively, from observed grain boundary groove shapes.
