Author/Authors :
Virginie Brizé، نويسنده , , V. and Gruener، نويسنده , , G. and Wolfman، نويسنده , , J. and Fatyeyeva، نويسنده , , K. and Tabellout، نويسنده , , M. and Gervais، نويسنده , , M. and Gervais، نويسنده , , F.، نويسنده ,
Abstract :
The CaCu3Ti4O12 (CCTO) compound shows an unusually high and almost temperature independent dielectric constant at low frequencies. CCTO powders have been synthesized by an organic gel-assisted citrate process. The ceramic microstructure was optimized for a given sintering process. Both the grain size and density are shown to be maximum when PVA is introduced in powder before the complete formation of CCTO. A correlated increase of the dielectric constant is evidenced by impedance spectroscopy measurements. Results support the IBLC model proposed to explain the high dielectric constant of CCTO.
Keywords :
Sintering , CaCu3Ti4O12 , Organic gel-assisted , PVA , High dielectric constant
