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Re‐investigation of Yttria–Tetragonal Zirconia Polycrystal (Y‐TZP) by Neutron Powder Diffraction – a Cautionary Tale
Author(s) -
Argyriou D. N.,
Howard C. J.
Publication year - 1995
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889894011015
Subject(s) - tetragonal crystal system , neutron diffraction , materials science , cubic zirconia , phase (matter) , crystallography , yttria stabilized zirconia , powder diffraction , diffraction , mineralogy , chemistry , crystal structure , composite material , optics , ceramic , organic chemistry , physics
In the re‐investigation by neutron powder diffraction of 3 mol% yttria–tetragonal zirconia polycrystal (Y‐TZP), it was realized that the sample, initially taken to be single‐phase tetragonal zirconia, was in fact a two‐phase mixture of the tetragonal (80%) and cubic (20%) polymorphs. Two‐phase refinement gave for the tetragonal phase [ P 4 2 / nmc , a = 3.6008 (1), c = 5.1793 (1) Å] the results z O = 0.4564 (1), B Zr,Y = 0.45 (2) and B O = 0.72 (2) Å 2 . Refinement on the basis of a single‐phase tetragonal sample yielded values for the position and displacement parameters somewhat biased towards those pertaining to the cubic phase. The conclusions from previous studies have been re‐examined in the light of the present work.