CRYSTAL CHEMISTRY OF PHASES IN THE SYSTEM PD-SB-TE
At 1000°C, palladium, Pd20Sb7, Pd8Sb3, stibiopalladinite (Pd31Sb12), and Pd5Sb2 are stable phases. At 800°C, sudburyite (PdSb), unnamed Pd8Te3, Pd5Sb3, and Pd20(Sb,Te)7 solid-solution. In addition, testibiopalladite (Pd9Te4), tellurantimony (Sb2Te3), unnamed PdSb2, antimony, Pd19Te4, and two complete solid solutions between sudburyite and kotulskite, and unmaned PdSb2 and merenskyite appear as stable phases at 600°C. All the phases in the system show solid solution mainly due to Sb and Te substitution, and their extent varies with temperature of formation.
In this study, synthetic PdSb2, presumably an analogue of natural PdSb2 was determined to be cubic with space group P213. Testibiopalladite, ideally PdSbTe, may be a member of the PdSb2-Pd(Sb0.32Te0.68)2 solid solution. Mineralogical properties for individual phases were compiled.