The equilibrated grain boundary groove shapes for the solid beta phase in Al-Zn liquid solutions were observed on quenched samples. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient for solid beta (Al-84 wt.% Zn) in Al-Zn liquid solutions has been determined to be (3.41 +/- 0.14) x 10(-8) Km with a numerical method. The solid-liquid interfacial energy between solid beta and Al-Zn liquid solution has been obtained to be (106.94 +/- 9.62) X 10(-3) J m(-2) from the Gibbs-Thomson equation. The grain boundary energy for the same material has been calculated to be (204.72 +/- 22.52) X 10(-3) J m(-2) from the observed grain boundary groove shapes. The thermal conductivities of the solid and liquid phases for Al-95 wt.% Zn and Al-84 wt.% Zn systems have also been measured. (C) 2003 Elsevier B.V. All rights reserved.