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Stability Field of Cotunnite‐Type Zirconia
Author(s) -
Ohtaka Osamu,
Kume Shoichi,
Ito Eiji
Publication year - 1990
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.1151-2916.1990.tb06584.x
Subject(s) - monoclinic crystal system , cubic zirconia , conductivity , materials science , classification of discontinuities , electrical resistivity and conductivity , phase (matter) , field (mathematics) , mineralogy , crystallography , analytical chemistry (journal) , chemistry , metallurgy , ceramic , crystal structure , mathematics , physics , mathematical analysis , organic chemistry , chromatography , quantum mechanics , pure mathematics
The stability field of cotunnite‐type ZrO 2 was determined by both syntheses and measurements of electrical conductivity under pressure using a 6–8 anvil‐type device. The products synthesized below 1000°C were ortho II, whereas those above this temperature were monoclinic when quenched. Abrupt discontinuities in conductivity were observed around 1000°C at 16.5 GPa and around 1050°C at 18 GPa. It is concluded, therefore, that the phase boundary lies a little above about 1000°C at pressures from 15 to 20 GPa with slightly positive slope. The result is consistent with that obtained by synthesis experiment.