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Neutron and high-resolution synchrotron x-ray diffraction measurements have indicated a tetragonal zirconia phase with both an axial ratio of unity and internal shear deformation: The oxygen displacements from ideal fluorite positions of 0.088 and 0.078 Å are observed for 65 and 70 mol % CeO[sub 2]–ZrO[sub 2] samples, respectively, although both c/a values are 1.000±0.001. The c/a ratio decreases with increasing of CeO[sub 2] content and decreases discontinuously to unity around a 60 mol % CeO[sub 2] composition, while the oxygen displacement decreases continuously up to about 90 mol % CeO[sub 2]. © 1998 American Institute of Physics. [ABSTRACT FROM AUTHOR]