Nanoparticles of the giant dielectric material, calcium copper titanate from a sol-gel technique

作者：Jesurani S^*; Kanagesan S; Velmurugan R; Thirupathi C; Sivakumar M; Kalaivani T

来源：Materials Letters, 2011, 65(21-22): 3305-3308.

DOI：10.1016/j.matlet.2011.06.107

• Nanoparticles
• Sol-gel preparation
• XRD
• AFM
• Ceramics
• Giant dielectric constant

The precursor of CaCu3Ti4O12 (CCTO) nano particles have been successfully synthesized by sol-gel method at 90 degrees C. The dried precursor powder was milled and then calcined at 450 degrees C, 550 degrees C, 650 degrees C, 800 degrees C, 850 degrees C and 950 degrees C for 3 h. The phase formation of CCTO was analyzed by step by step using FTIR and XRD. Particle size and shape were evaluated by AFM. The XRD results of the powder calcined at 800 degrees C indicated the formation of CCTO phase. AFM studies showed that average particle size of the CCTO powder range 90-120 nm. The absorption bands corresponding to vibrations of Ca-O, Cu-O and Ti-O-Ti were observed at 606, 525 and 463 cm(-1) using FTIR. The samples sintered at 1040 degrees C showed the densities as high as 96% of theoretical density. The grain sizes of sintered pellets were determined by FE-SEM. The dielectric properties of prepared samples were studied by LCR meter.

• 出版日期2011-11