NEUTRON AND X-RAY DIFFUSE-SCATTERING OF CALCIUM-STABILIZED ZIRCONIA AT TEMPERATURES UP TO 1500 K

The temperature dependence of disorder diffuse scattering of calcium-s tabilized zirconia was measured with neutron and X-ray scattering meth ods up to 1500 K. A quantitative interpretation of the diffuse scatter ing is given in terms of a correlated distribution of two types of mic rodomains. A pronounced decrease of the integrated intensity of the di ffuse maxima was found in the temperature range 1250-1300 K in both ne utron and X-ray cases. However, the half-width of the diffuse maxima a nd the corresponding correlation length shows a different temperature behaviour. The neutron data indicate an almost constant correlation le ngth as a function of temperature, whereas the X-ray data show a maxim um at 1170 K. A tentative interpretation is given.