Lead F ree and L ow T emperature Sintered (1-x)BaTiO 3 -xBa(Mg 1/3 Nb 2/3 )O 3 Ceramics.
Munpakdee A., T ontrak oon J. and T unk asiri T .* Author for corresponding; e-mail address: -
Volume :Vol.32 No.3 (SEPTEMBER 2005)
Research Article
DOI:
Received: -, Revised: -, Accepted: -, Published: -
Citation: A. M.., J. T.O.O.. and . T.U.A..T., Lead F ree and L ow T emperature Sintered (1-x)BaTiO 3 -xBa(Mg 1/3 Nb 2/3 )O 3 Ceramics., Chiang Mai Journal of Science, 2005; 32(3): 229-238.
Abstract
Fabrication of barium titanate (BT)-barium magnesium niobate (BMN) ceramics was carried out, corresponding to the formula (1-x)BT+xBMN, where x varies form 0.01 to 0.06. The mixed-oxide synthetic route was employed. The sintering temperature was varied from 1300 °C to 1450 °C. It was found that higher value of x results in higher sintering temperature. Phase evolution of the ceramics was studied by the X-ray diffraction (XRD) technique. The ferroelectric phase was found to occur at the low doping values of x, (x = 0.01-0.03). Transformation of ferroelectric to paraelectric phase occurred when x = 0.02. The highest dielectric constant was found at x = 0.02. In addition to reducing the sintering temperature of the particular ceramics, sintering flux such as Bi2O3 /LiCO3 -PbO was employed to mix with the samples. The results showed that the sintering temperature could be reduced down to 1000 °C with the exceptional high dielectric constants.