Abstract
A ternary isobaric diagram has been drawn for the PbO 2-PbO-B 2O 3 system in air. The occurrence of the compounds PbO·2B 2O 3, PbO·B 2O 3 (s.s.), 2PbO·B 2O 3 (s.s.) and 4PbO·B 2O 3 has been confirmed, and their stability regions fixed. PbO has also been found to exist in this system as a solid solution. The presence of B 2O 3 destabilizes Pb 3O 4, causing it to dissociate to PbO at 490 ° C, rather that at 560 ° C as for the pure oxide.
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