Phase Equilibria in the Lead-Magnesium-Niobium-Oxygen System at 1000°C

Pierre Lucas, William T. Petuskey

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Abstract

Phase equilibria in the PbO-MgO-Nb2O5 system have been determined at 1000°C and 1 atm. A solid-solution range of the cubic pyrochlore phase was observed and the extent of that domain was determined. This solid solution equilibrates with the surrounding ternary and binary compounds to form a series of diphasic areas. The compatibility relations between all phases were determined except for a small domain where at least six lead niobate phases were stable within a very short range of compositions. The formation of pyrochlore impurities during the processing of Pb(Mg1/3Nb2/3)O3 perovskite is discussed in relation to the phase diagram.

Original languageEnglish (US)
Pages (from-to)2150-2152
Number of pages3
JournalJournal of the American Ceramic Society
Volume84
Issue number9
StatePublished - Sep 1 2001

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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