SOL-GEL COMBUSTION SYNTHESIS OF GIANT DIELECTRIC CaCu3Ti4O12 NANO POWDER
Keywords:
Sol-gel combustion, Giant Dielectric Constant, Nano Powder, CaCu3Ti4O12Abstract
Nano-sized powders of Calcium Copper Titanate (CaCu3Ti4O12) were synthesized by a sol-gel combustion method without using any external fuels. The powder was calcined at 500, 650 and 800 °C in air for 3 hr. The CaCu3Ti4O12 powders were characterized by TG-DTA, XRD, FTIR and AFM. The XRD results for the powders calcined at 650°C ,800°C and sintered at 950°C indicated the formation and confirmation of [(CaCu3)Ti4O12] CCTO phase. AFM studies showed that average particle size of the CCTO powder ranges from 60 to 80nm. HR-SEM micrographs of the sintered CaCu3Ti4O12 ceramics showed the grain size ranges from 1 to 2.8 µm. Dielectric constant (e) about 9919 at room temperature for 10 kHz. It reaches as high as 1, 06,175 at 500 °C. The present material shows the dielectric relaxation at 300 °C. CCTO Nano powder prepared by the sol-gel combustion process with ideal electric properties is expected to find applications in microelectronic devices
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