Abstract
PbxMo6Sy arises as the sole ternary compound in the System Pb–Mo–S. At 1250 K it is surrounded by 4 phase regions with 3 solid phases. It has a homogeneity range of between 0.9 ≤ x < 1.1 and 7.6 ≤ y > ≤ 7.9. Tc changes within the homogeneity range. Chemical transport is possible within a limited section of the phase diagram in the presence of lead halides.