It is well known that materials electrical properties changed in time after pressure treatment.
We studied relaxation processes in ZrO2 at the pressures in range 22 - 50 GPa. Nanocrystalline praseodymium doped zirconia powders were produced using a microwave driven hydrothermal process under pressures up to 8 GPa. Nanopowders of zirconia with Pr in solid solutions having Pr contents of 0.5 mol %. The bulk material sample of zirconia having Y2O3 contents of 5 mol %. Size of crystallites changed from 10 to 500 nm.
The dc resistance measurements were carried out in a diamond anvil cell rounded cone-plane type. We found times dependence of resistance at different pressure for all samples.
The analysis of experimental data has shown that the time function of electric resistance most precisely described by exponential function for the sample with crystallite size 10 nm and for polycrystal sample up to pressure 44-45.5 GPa. After pressure treatment higher than 45.5 GPa the character of the relaxation changed and resistance increases with increasing time for the sample with crystallite size 10 nm, while the relaxation disappear for polycrystal sample. Relaxation processes in ZrO2 with 56 nm crystallite size does not take place.
It can be seen, that relaxation times depend on pressure and crystallite size.

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