화학공학소재연구정보센터
Materials Research Bulletin, Vol.75, 167-171, 2016
Ferroelectric PLZT thick films grown by poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA)-modified sol-gel process
We report the growth of ferroelectric Pb0.92La0.08Zr0.52TiO4O3 (PLZT) thick films using a poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA)-modified sal-gel process. A per-coating thickness of approximate to 0.66 mu m has been demonstrated using PVP/VA-modified solution, which is more than doubled that of the PLZT films grown by PVP-modified method, and nearly 6 times the per-coating thickness of films prepared by conventional sal-gel process. PLZT thick films grown on LNO/Ni substrates exhibited denser microstructure, higher remanent polarization (11 mu C/cm(2)) and dielectric tunability (45%), lower leakage current density (approximate to 1.2 x 10(-8) A/cm(2)), and higher breakdown strength (approximate to 1.6 MV/cm) than those for the samples grown on PtSi substrates. These results demonstrated great potential of using PVP/VA-modified sol-gel process for high power film capacitor applications. (C) 2015 Published by Elsevier Ltd.