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Abstract
The detailed physical and ferroelectric related properties of a modified PbTiO3 ceramic (Pb0.9Sm0.1)TiO3 were investigated and the results were then discussed in terms of the usefulness of this material for IR sensors. It was found that the Sm-modified PbTiO3 had a low dielectric constant, high pyroelectric coefficient and favourable thermal and mechanical characteristics. The Curie temperature in comparison to unmodified PbTiO3 ceramic was reduced from 470°C to 156°C in the Sm-modified ceramic. The calculated figures of merit based on the measured properties were compared with other PbTiO3 compositions and LiTaO3 single crystal. The results indicate that the Sm-modified PbTiO3 ceramic is a favorable material for both transverse mode and pyroelectric/CCD arrays. The material has an internal bias field of about 1.2KV/cm to its polarization which can yield long term detector operation.
