Radiation resistance of PFN and PMN–PT relaxor ferroelectrics

Abstract The relaxor ferroelectric compositions Pb(Fe1/2Nb1/2)O3 (PFN) and [Pb(Mg1/3Nb2/3)O3]0.8–[PbTiO3]0.2 (PMN–PT) are studied for their radiation response to the high energy heavy ions ( 50 MeV Li 3+ , fluence 1×1013– 1×10 14 ions / cm 2 ) in terms of their structural, dielectric and piezoelectric properties. There was no change in the crystallinity of both the compositions after irradiation as seen from the XRD. The PFN composition did not show much change in the dielectric constant but the value of Tm decreased by 8°C. The PMN–PT composition showed an increase in the dielectric constant with increase in the irradiation fluence from 1×1013 to 1×10 14 ions / cm 2 with no change in the value of Tm. The piezoelectric coefficient decreased in both the samples after irradiation. Among the compositions studied, PFN is observed to be more radiation resistant to changes in structural and dielectric properties than PMN–PT.

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