A biomimetic in-situ synthesis of PbS in PEO has been devised, which produces composites in which the inorganic phase can display regularity of morphology and crystallographic orientation. This in-situ synthesis of PbS in a PEO film has also produced two previously unknown phases of lead sulfide, one of which can be described as "compressed" galena (PbS), the other is a new form of lead disulfide (PbS 2 ).
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