Dielectric ageing behaviors of lead-based relasor ferroelectric ceramics, which may affect their application in multilayer ceramic capacitors (MLCs), have been an important research problem for many years. In this paper, the effects of annealing on ageing properties of the PMN-O.lPT system, respectively doped with Fe, CO and Ni ions and annealed in different atmospheres (air and Nz-Hz) after sintering, were studied. It is found that the annealing atmosphere has a strong influence on the ageing degree of the samples. For the airannealed samples, the decrease in the dielectric constant was small; whilst for the N2-Hz-annealed samples, the decrease was much greater. It is assumed that the different valences of doped ions, resulting from the different annealing atmospheres, are responsible for the different ageing degrees.
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.
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