The pseudobinary alloy Pb_1-xSrₓS exists as a single phase at all compositions. With change in composition the optical absorption edge at 300 K changes continuously from 0.4 eV for PbS to 4.6 eV for SrS. For compositions with x≤0.2, p-type and n-type thin films have been prepared by doping with Tl or Ag and with Bi, respectively. Similar single-phase behavior and composition dependence of the energy gap are found with Pb_1-xCaₓS.
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Holloway et al. (1982) studied this question.
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