Phase equilibria of the lead-magnesium-titanate and lead-niobium-titanate systems at 1000°C and 1 atm

Robert Mangham, William Petuskey

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Abstract

Phase equilibria of the PbO-MgO-TiO 2 and PbO-Nb 2O 5-TiO 2 systems have been experimentally determined at 1000°C and 1 atm pressure. This work is part of an overall comprehensive thermal analysis of the ferroelectric relaxor system Pb(Mg 1/3Nb 2/3)O 3-PbTiO 3. In the PbO-MgO-TiO 2 system, lead titanate equilibrates with each of the magnesium titanates, MgO and a titania saturated liquid lead oxide. The most significant feature in the PbO-Nb 2O 5-TiO 2 system is the extent of solid solution of the lead and oxygen-defect pyrochlore phase, Pb 3(Nb 1-xTi x) 4O 13, in which titanium dissolution is as much as x = 0.394 (or ∼22.5 cation % Ti 4+).

Original languageEnglish (US)
Pages (from-to)139-149
Number of pages11
JournalCeramic Transactions
Volume169
Publication statusPublished - 2005

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ASJC Scopus subject areas

  • Ceramics and Composites

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