Brillouin scattering studies of stabilised zirconias at high temperature

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Abstract
Brillouin scattering studies have been performed on single crystals of stabilised zirconia, ZrO2(xY2O3), in the temperature range 300 to 1450 K. The frequency shifts of the inelastically scattered light from acoustic phonon modes propagating in (100) and (110) directions have been measured. These and the associated elastic constants or their combinations show a linear decrease with temperature at lower temperatures attributed to lattice expansion, followed by a more marked decrease above a transition temperature Tc. The value of Tc depends on the concentration x of Y2O3 and varies from about 1050 K for x=24 mol% to about 1330 K for x=9.4 mol.%. The results are discussed in terms of the cooperative production of disorder on the anion sublattice similar to that observed in fluorites in the super-ionic regime.