부산대학교 도서관

CaCu 3 Ti 4 O 12 (CCTO) and CaCu 3 Ti 4.2 O 12 (TiO2) precursor powders were prepared by the polymer pyrolysis solution method. Effect of sintering time/temperature on microstructural, dielectric and non-linear properties of CCTO and TiO2 ceramic samples obtained by sintering all precursor powders at various sintering conditions were investigated. Interestingly, very low tanδ ∼ 0.008 and high ε ′ ∼ 7221 with temperature coefficients Δ ε' < ± 15% in a wide temperature range of − 60 to 180 °C were achieved in the TiO2 ceramic sample sintered at 1025 °C for 12 h (TiO2-2 sample). This suggested the potential use of TiO2-2 sample for EIA X5R, X7R and X8R capacitors. Moreover, sintering could enhance the non-linear characteristics of all ceramic samples with a non-linear coefficient ( α ) of ~ 29.04 and the maximum breakdown field ( E b ) of ~ 12,221 V/cm −1 in TiO2-2 sample. Enhancement of ε ′ due to the sintering was suggested to originate from the promotion of oxygen vacancies and the increase of grain size. [ABSTRACT FROM AUTHOR]