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Porous lead zirconate titanate(PbZr0.3Ti0.7O3,PZT30/70)thick films and detectors for pyroelectric applications have been fabricated on alumina substrates by screen-printing technology.Low temperature sintering of PZT thick films have been achieved at 850℃ by using Li2CO3 and Bi2O3 sintering aids.The microstructure of PZT thick film has been investigated by X-Ray diffraction(XRD)and scanning electron microscopy(SEM).