Abstract
Pyroelectric performance of the composites of plaster of Paris (POP) and the lead-free Sr0.5Ba0.5Nb2O6 (SBN) ceramic have been studied in this paper. SBN-POP composites with 30, 40, 50, and 60% SBN content by weight referred as SBN30, SBN40, SBN50, and SBN60 have been studied. The dielectric constants for SBN30, SBN40, SBN50, and SBN60 composites are obtained as 10.51, 21.62, 43.61, and 57, respectively at room temperature (25 °C). The maximum open-circuit voltages in the range of 31 to 103 mV could be obtained by subjecting the SBN-POP composite samples to temperature gradient by blowing hot and cold air. Further maximum voltages in the range of 8 to 34 mV and maximum current in the range of 2.9 to 18 nA could be obtained across 1 MΩ resistance. The SBN-POP composites seem to be suitable candidate to be used as pyroelectric sensors.
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