Abstract
The thermal conductivity and thermoelectric power of six specimens of PbS and one each of PbSe and PbTe have been measured at temperatures ranging from 4°K to 100°K. In the same temperature region the charge carrier mobility in these samples was determined from measurements of electrical resistivity and Hall coefficient. Four of the PbS samples were natural and n type, while the other specimens were synthetic and p type. The synthetic samples contained only a few single crystals but two of the natural specimens were highly polycrystalline.

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