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Phase Equilibrium and Martensitic Transformation in Lanthana‐Doped Zirconia
Author(s) -
BASTIDE B.,
ODIER P.,
COUTURES J.P.
Publication year - 1988
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.1151-2916.1988.tb05893.x
Subject(s) - materials science , eutectic system , phase diagram , pyrochlore , diffusionless transformation , cubic zirconia , solubility , thermodynamics , atmospheric temperature range , phase (matter) , solid solubility , analytical chemistry (journal) , crystallography , solid solution , mineralogy , martensite , metallurgy , microstructure , ceramic , chemistry , physics , organic chemistry , chromatography
The system ZrO 2 ‐La 2 O 3 has been studied in the 0 to 15 mol% La 2 O 3 range using X‐ray diffraction and thermal analysis. Two kinds of diagrams were elaborated: First is a phase equilibrium diagram where the eutectoid decomposition of ZrO 2, ss (T) → ZrO 2, ss (M) + Py ss occurs at 1100°C and 0.75 mol% La 2 O 3 (Py is the pyrochlore compound Zr 2 La 2 O 7 ). The maximum solubility of La 2 O 3 in ZrO 2, ss (M) is 0.5 mol% at room temperature. Second, a nonequilibrium diagram is determined showing the correlations between grain size, La 2 O 3 content, and the martensitic transformation temperature start ( Ms ).