Abstract
The CuAsS2-PbS, CuAsS2-EuS, and CuAsS2-YbS systems have been studied for the first time and their phase diagrams have been mapped out. We have identified the MCuAsS3 (M — Pb, Eu, Yb) compounds (seligmannite structure, Z = 4, sp. gr. Pmn21) and determined their lattice parameters: a = 8.125, b = 8.748, c = 7.644 A (PbCuAsS3); a = 8.04, b = 8.66, c = 7.60 A (EuCuAsS3); a = 8.00, b = 8.62, c = 7.54 A (YbCuAsS3).
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