The dielectric contribution to the electric response of yttria fully-stabil
ized zirconia (YFSZ) single crystals was included by using the Kohlrausch-W
illiams-Watts step response Function. The results obtained can be explained
by assuming an elastic coupling between a hopping vacancy and the lattice
approximated by a continuous elastic media. The wavelength for this elastic
coupling was in all cases at least 190 times the unit-cell parameters.