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Phase Equilibria in the Lead–Magnesium–Niobium–Oxygen System at 1000°C
Author(s) -
Lucas Pierre,
Petuskey William T.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00979.x
Subject(s) - pyrochlore , solid solution , phase diagram , niobium , impurity , magnesium , ternary operation , materials science , ternary numeral system , analytical chemistry (journal) , perovskite (structure) , phase (matter) , oxygen , mineralogy , inorganic chemistry , binary system , thermodynamics , chemistry , binary number , crystallography , metallurgy , chromatography , physics , organic chemistry , computer science , programming language , arithmetic , mathematics
Phase equilibria in the PbO–MgO–Nb 2 O 5 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(Mg 1/3 Nb 2/3 )O 3 perovskite is discussed in relation to the phase diagram.
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