Exploratory studies of the Cu–Pd–Se system at 650°C, 550°C, 400°C, and 300°C
Makovicky, Emil; Karup-Møller, Sven
European Journal of Mineralogy Volume 29 Number 4 (2017), p. 645 - 652
published: Sep 1, 2017
ArtNo. ESP147052904022, Price: 29.00 €
The condensed-phase system Cu–Pd–Se was investigated by means of dry syntheses from elements in evacuated silica glass tubes at 650°C, 550°C, 400°C, and 300°C. Synthetized phases were analysed by electron microprobe and textural studies in polished sections. At 650°C an extensive selenide liquidfield covers central portions of the system, coexisting with a limited choice of Pd selenides, Cu2 À x Se, alloys, and a (Cu, Pd)Se2 solid solution. The selenide melt recedes to the Pd side of the system at 550°C and its remnants persist at 400°C. At the lower temperature, the gamut of Pd selenides becomes richer, and especially Pd4 Se and Pd17 Se15 display significant solubility of Cu. The composition range of (Cu, Pd)Se2 broadens and moves towards Cu-richer compositions as temperature decreases; CuSe and CuSe2 appear at 300°C. The synthetic analogue of jaguéite, Cu2 Pd3 Se4, is present at 400°C and 300°C, at Se concentrations above the Cu2 À x Se–Pd17 Se15 line. At all examined temperatures, the individualized CuPd alloy dissolves Se, up to ~5 at% at low temperatures.