Abstract
Ba0.67−xYxSr0.33Ti1−yMnyO3 [(Mn+Y: BST), x=0.006, y=0.005] ceramics were fabricated via using citrate–nitrate combustion derived powder, and their microstructure, dielectric properties and pyroelectric properties were systemically investigated within sintering temperature ranged from 1200°C to 1310°C. Slight agglomerated BST powders, with nano-size parties, were produced at calcining temperature of 800°C. Sintering temperature has a great influence on the microstructure and electrical properties of the ceramic samples. The dielectric and pyroelectric properties are improved with sintering temperature increased from 1200°C to 1280°C. At room temperature, the Mn+Y: BST ceramics sintered at 1280°C for 3h exhibit optimal electrical properties: dielectric loss tanδ=0.007, intrinsic pyroelectric coefficient γ=773nC/cm2K and figure-of-merit FD=134.5μPa−0.5 at 100Hz, respectively. Improvement of pyroelectric properties is beneficial to the development of infrared detectors.
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