Enhancement of energy storage and thermal stability of relaxor Pb0.92La0.08Zr0.52Ti0.48O<su b>3 -Bi(Zn0.66Nb0.33)O3 thick films through aerosol deposition

초록

Relaxor ferroelectric Pb0.92La0.08Zr0.52Ti0.48O3 (PLZT 8/52/48) has been studied widely for applications to high energy storage capacitors because of its polarization-electric (P-E) field hysteresis. On the other hand, its energy storage characteristics are unsatisfactory because the dielectric properties deteriorate with temperature. In the present study, a dense nano-composite thick film ( similar to 5 mu m) was fabricated by the aerosol deposition (AD) of mixed powders of BZN [Bi(Zn0.66Nb0.33)O-3] corresponding to 0, 5, and 10 at.% with lanthanum-doped lead zirconate titanate ceramics (PLZT) at room temperature, followed by post-annealing for crystallization recovery. The composition of 0.95(Pb0.92La0.08Zr0.52Ti0.48O3)-0.05Bi(Zn0.66Nb0.33O3) PLZT-BZN5 was made artificially, which accommodates the coexistence of two different phases, demonstrating superior energy storage performance. The 550 degrees C-annealed PLZT-BZN5 film showed a superior energy density of 14.7 J/cm(3) under an electric field of 1400 kV/cm and an efficiency of 81%. The PLZT-BZN5 film also exhibited low dielectric loss and improved temperature stability.

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