Abstract
Ceramics based on Bi 3NbTiO 9 (BNT) were investigated for their high-temperature pyroelectric properties. Doping BNT with 0.05 atoms of W 6+ donor ions decreased its DC conductivity, enhanced its dielectric strength and remnant polarization. Thick films of BNT produced by airflow deposition show preferential grain orientation and enhanced sinterability, giving improved polarizability and higher dielectric strength than the comparable ceramic. Further improvements in grain orientation and enhanced remnant polarization are derived by sintering under an applied electric field. Airflow deposition was also used to prepare graded films of Ba (1− x) Sr x TiO 3 (BST), showing temperature dependent hysteresis offsets that originate from asymmetric leakage currents and are not related to the pyroelectric properties. These graded films show an enhanced conventional pyroelectric coefficient over a wide temperature range. These results predict that a graded structure of BaBi 2Ta 2O 9 and Bi 3NbTi 0.95W 0.05O 9 should show enhanced high-temperature pyroelectric properties.
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