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Neutron powder diffraction has been used to measure the temperature factors of both the cation and the anion atoms in 10mol% Y2O3-ZrO2 over the temperature range 15 to 1323 K. The Housley-Hess approach has been used to determine the static disorder term of the temperature factors for both the Zr/Y and O atoms. The static contribution was determined to be 1.04 (6) Å2 for Zr/Y and 2.2 (1) Å2 for O. From these results, a Debye temperature of 527 (20) K was calculated for this sample.