Abstract
The phase field of PbMo 6S 8 at 900°C was investigated by X-ray diffractometry. At 900°C the PbMo 6S 8 phase is surrounded by three two-phase regions — PbMo 6S 8 + Pb(1.), PbMo 6S 8 + Mo and PbMo 6S 8 + MoS 2. This synthesis temperature is rather low, and the grain size of the samples is considerably smaller (0.5–1.5 μm). The superconducting transition temperatures of various Pb xMo 6S 8−y samples were measured inductively, and a clear correlation between Tc and the composition was observed. The critical temperatures got higher when the sulfur content of the PbMo 6S 8 phase increased. The samples were characterized with X-ray diffraction, scanning electron microscopy and energy dispersive X-ray microanalysis. The variation of Tc is discussed in relation to the sulfur defects.
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