A Discernible Dielectric Aging Effect in the Undoped, N₂‐H₂‐Annealed Lead Magnesium Niobate—Lead Titanate Ceramic

Abstract

It is well known that the undoped Pb(Mg1/3Nb2/3)O3‐PbTiO3 ceramics, prepared through conventional ceramic processing, present no evident aging effect. In this paper, however, a discernible aging phenomenon was observed in an undoped, N2‐H2‐annealed ceramic. When this sample was later annealed again in air, this effect became negligible again just like that of a normally prepared PMN—PT ceramic. The valence states of Ti ions, which may be changeable in different annealing atmospheres, were assumed to be responsible for the different degrees of aging.