Isothermal Section of the Pt—Sb—Te System at 1000 °C.

Kim, Won-Sa

doi:10.1002/chin.200614018

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“…The temperature of 1000°C was chosen for this study because Skinner et al (1976) adopted 1000°C to divide higher temperature liquidus processes from lower temperature subsolidus reactions. Unfortunately, the experimental data available in the literature are only on the Ptor Pd-bearing antimonides (Kim, 1997(Kim, , 1999(Kim, , 2006Kim and Chao, 1991), and the information on the Pt-Pd-Sb ternary phase relations is non-existent.…”

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confidence: 97%

Synthesis of Pt-Pd antimonide minerals at 1000 °C and the extent of Pt-Pd substitutions

Kim

2009

Geosci J

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Phase relations of the Pt-Pd-Sb system were investigated at 1000°C, with an emphasis on the extent of Pt-Pd substitutions in Pt and Pd antimonide minerals and their stable assemblages. The sealed capsule technique was used, and the reaction products were examined using reflected light microscope, Xray powder diffractometer, and electron microprobe. Pt-Pd alloy minerals, stumpflite (PtSb), geversite (PtSb 2 ), mertieite II (Pd 8 Sb 3 ), and stibiopalladinite (Pd 31 Sb 12 ) occur as solid phases. In addition, solid phases with compositions of Pd 20 Sb 7 and Pd 5 Sb 2 are present. The extents of the Pd substitution for Pt in stumpflite and geversite were measured to be 18 and 7.2 atom (at.) %, respectively. Mertieite II (Pd 8 Sb 3 ) and stibiopalladinite (Pd 31 Sb 12 ,) show almost identical extent of the Pt-Pd substitution (22 at.%). The Pt substitutions for Pd in synthetic phases of Pd 20 Sb 7 and Pd 5 Sb 2 range up to 27 and 19.6 at.%, respectively. Pt and Pd form a complete solid solution and their solid solutions with Sb range from 7.5 at.% along the PtSb binary join to 16.5 at.% along the Pd-Sb binary join.

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