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Neutron Diffraction Observations of Ferroelastic Domain Switching and Tetragonal‐to‐Monoclinic Transformation in Ce‐TZP
Author(s) -
Kisi Erich H.,
Kennedy Shane J.,
Howard Christopher J.
Publication year - 1997
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.1151-2916.1997.tb02877.x
Subject(s) - tetragonal crystal system , monoclinic crystal system , materials science , neutron diffraction , crystallography , ferroelasticity , phase (matter) , anisotropy , condensed matter physics , composite material , crystal structure , ferroelectricity , chemistry , optics , dielectric , physics , optoelectronics , organic chemistry
In‐situ neutron diffraction has been used to study the plastic deformation of a tetragonal zirconia polycrystal stabilized with 12 mol% ceria under compressive loads up to 1.6 GPa. The development of significant plastic strain in the ceramic has been found to be due to a combination of ferroelastic switching and the tetragonal‐to‐monoclinic phase transformation, both beginning at} 1.2 GPa. Evidence of a strong coupling between the two phenomena is present. Both transitions are partially reversed on removal of the load. The linear elastic response of the a and c crystal axes of the parent tetragonal phase suggests that the ferroelastic switching occurs directly by a shear mechanism rather than via a cubic intermediate state. Anisotropic distortion of the tetragonal unit cell, as the critical stress is approached, gives some insight into the shear transformation mechanisms.