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Phase Stability and Physical Properties of Cubic and Tetragonal ZrO 2 in the System ZrO 2 –Y 2 O 3 –Ta 2 O 5
Author(s) -
Kim DaeJoon,
Tien TsengYing
Publication year - 1991
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.1151-2916.1991.tb04302.x
Subject(s) - tetragonal crystal system , monoclinic crystal system , solid solution , materials science , cubic zirconia , fluorite , phase (matter) , crystallography , toughness , fracture toughness , mineralogy , analytical chemistry (journal) , crystal structure , metallurgy , chemistry , ceramic , organic chemistry , chromatography
The cubic ( c ‐ZrO 2 ) and tetragonal zirconia ( t ‐ZrO 2 ) phase stability regions in the system ZrO 2 –Y 2 O 3 –Ta 2 O 5 were delineated. The c ‐ZrO 2 solid solutions are formed with the fluorite structure. The t ‐ZrO 2 solid solutions having a c/a axial ratio (tetragonality) smaller than 1.0203 display high fracture toughness (5 to 14 MPa · m 1/2 ), and their instability/transformability to monoclinic zirconia ( m ‐ZrO 2 ) increases with increasing tetragonality. On the other hand, the t ‐ZrO 2 solid solutions stabilized at room temperature with tetragonality greater than 1.0203 have low toughness values (2 to 5 MPa · m 1/2 ), and their transformability is not related to the tetragonality.