Phase Relations in the System Lead—Oxygen
Authors:
- 1 May 1964
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 47 (5) , 242-249
Abstract
Most of the known oxides of lead including the intermediate oxides Pb 12 O 19 and Pb 2 O 3 have been prepared under equilibrium conditions. Precise X‐ray powder data have been obtained for the intermediate oxide phases. Solid‐vapor equilibrium data have been obtained for reactions in the system lead‐oxygen over the range 200° to 900° C and 3 to 1400 bars Po 2 . Pressure‐temperature univariant equilibrium curves are presented for the reactions PbO 2 ⇋ Pb 12 O 19 + oxygen, Pb 12 O 19 ⇋ Pb 3 O 4 + oxygen, and Pb 3 O 4 ⇋ PbO + oxygen. The enthalpies of reaction are, respectively, 26.8, 34.6, and 33.7 kcal per mole. Eutectic melting between PbO and Pb 3 O 4 occurs at 875° C and 124 bars. A stability field for Pb 2 O 3 exists above 1000 bars PO 2 at 600° C. Approximate resistivity data are presented.Keywords
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