A thermal analysis of the system PbBr2sngbnd;PbO proved the existence of four compounds intermediate between PbBr2and PbO, namely PbBr2middot;PbO, PbBr2middot;2PbO, PbBr2middot;3PbO, and PbBr2middot;7PbO. The compound PbBr2middot;PbO was unstable above 497deg;C whereas the others were stable at their melting points. Pure PbBr2middot;PbOmiddot;H2O (or Pb(OH)Br) was prepared and was found to decompose into PbBr2middot;PbO at temperatures above 150deg;C. This work offers an explanation for the discrepancies among data reported in the literature for the melting point of lead bromide.
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