Thermal Analysis of the System PbBr2–PbO

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Abstract
A thermal analysis of the system PbBr2–PbO proved the existence of four compounds intermediate between PbBr2 and PbO, namely PbBr2·PbO, PbBr2·2PbO, PbBr2·3PbO, and PbBr2·7PbO. The compound PbBr2·PbO was unstable above 497°C whereas the others were stable at their melting points. Pure PbBr2·PbO·H2O (or Pb(OH)Br) was prepared and was found to decompose into PbBr2·PbO at temperatures above 150°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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