Energy storaoe performance and thermal stability of BNT-SBT with artificially modulated nano-grains via aerosol deposition method

초록

With the development of electrical industry, demand for a ceramic-based capacitor with high energy storage density has been increased gradually. The efficiency considered as a key factor of energy storage density is sensitive to temperature change. In this study, using the aerosol deposition (AD) method, we have fabricated lead-free 6Bi(0.5)Na(0.5)TiO(3)(BNT)-4Sr(0.7)Bi(0.7)TiO(3)(SBT) nano-grain composites to improve the energy storage properties and thermal stability. Through the novel AD method, artificially engineered ferroelectric thick films with nano-grain can be fabricated at room temperature. The thick films of 6BNT-4SBT post-annealed at 550 degrees C had an energy storage density of 10.4 J/cm(3), high efficiency of 64.5% at 900 kV/cm, and excellent thermal stabilities (Delta W-rec < similar to 9% and Delta n < similar to 30%) heating to 140 degrees C. These results reveal that 6BNT-4SBT thick films fabricated by the AD method have excellent dielectric properties and thermal stabilities as a lead-free material.

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