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Effect of Dopant Species on Tetragonal ( t ′)‐to‐Monoclinic Phase Transformation of Arc‐Melted ZrO 2 ‐RO, 1.5 (R = Sm, Y, Er, and Sc) in Water at 200°C and 100 MPa Pressure
Author(s) -
Yashima Masatomo,
Nagatome Tomoo,
Noma Tatsuo,
Ishizawa Nobuo,
Suzuki Yasuo,
Yoshimura Masahiro
Publication year - 1995
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.1151-2916.1995.tb08643.x
Subject(s) - monoclinic crystal system , tetragonal crystal system , ionic radius , dopant , materials science , cubic zirconia , annealing (glass) , crystallography , analytical chemistry (journal) , phase (matter) , mineralogy , doping , crystal structure , ion , chemistry , metallurgy , ceramic , optoelectronics , organic chemistry , chromatography
Arc‐melted specimens of rare‐earth‐doped zirconia (ZrO 2 ‐ X mol% RO 1.5 ; X = 4–10 for R = Sm, Y, Er, and X = 4–18 for Sc) were hydrothermally treated at 200°C, 100 MPa to investigate the dependence of the tetragonal‐to‐monoclinic transformation on dopant species and its content. The volume fraction of monoclinic phase Vm ( t ) increased from Vm (0) to a certain saturated value Vm (ω), following [ Vm ( t ) − Vm (0)]/[ Vm ( t ) − Vm (ω)] = 1 − exp(− k·t ), where t is the annealing time at 200°C, 100 MPa. The transform‐abilities, Vm (0), Vm (ω), and k decrease with increasing dopant content. The Vm (ω) decreased with an increase of ionic radius of dopants. The relation 0 < Vm (ω) < 1 suggests that apparent noncompositional inhomogeneity exists in the hydrothermally treated sample.