Aging effect in Pb(Mg 1/3 Nb 2/3 )O 3 )–PbTiO 3 single crystal

The aging effect near the critical endpoint in 70.5%Pb(Mg1/3Nb2/3)O-3-29.5%PbTiO3 (PMN-29.5%PT) has been investigated, through the measurement of DC field dependence of the permittivity. A delay of the permittivity peak due to the aging effect when changing the DC biasing field has been found, depending on the sweep speed of the DC biasing field. We have also found that the delay almost disappears in the sweep time longer than 100 h. The aging effect found in our experiment for PMN-29.5%PT has been discussed on the basis of the phenomenological theory taking account the delay of the polarization. (C) 2019 The Japan Society of Applied Physics