THE SYSTEM FE-RH-S AT 900° AND 500°C

Abstract

The condensed phase system Fe-Rh-S was studied by means of dry syntheses at 900 and 500°C. At 900°C. there are fields of γ(Fe,Rh) with up to 29.7 at % Rh. α(Fe,Rh) with 40-50.4 at% Rh and γ(Rh,Fe) between o and 34.3 at.% Fe. Fe1 S that dissolves up to 25.7 at. % Rh at 55 at.% S, sulfide melt centered on -37.5 at.% S and 40 at.% Rh, Rh17S15 (up to 7.5 at.% Fe). Rh3S4. Rh2S3 and Rh2.75S7.25 ("RhS3") dissolving up to 4 at.% Fe. At 500°C, α(Fe,Rh) contains up to 9.5 at.% Rh. (Fe,Rh) has 33.5-52.2 at.% Rh. followed by γ(Rh,Fe). Fe1-xS dissolves up to 2.8 at.% Rh at 52.5 at.% S. Thiospinel Fe(Fe0.08Rh1.92)S4 is associated with FeS2, Rh1-S15 (up to 4 at.% Fe) and Rh2S3 "RhS" contains less than 1 at.% Fe. The principal assemblages are defined for both temperatures. We discuss data from the partly studied Fe-Ni Rh-S System and compare the partition patterns of Rh inferred from the current study with those from sulfide-PGE deposits.