Effects of La-Dopant on Phase, Microstructure and Dielectric Properties of Bi4Ti3O12 Ceramics
Bi4-xLaxTi3O12 (where x = 0, 0.25, 0.50, 0.75 and 1) powders and ceramics were prepared using conventional solid state reaction and sintering procedures. The calcination was carried out at 750 °C for 4 h and sintering was done at 1150 °C for 4 h. The density of all ceramics was found to be comparable regardless of La concentration. X-ray diffraction analysis showed that preferred orientation of ceramic grains was reduced with addition of La ions. This reduced preferred orientation was accompanied by a decrease in grain size. The temperature dependence of dielectric constant showed a decrease in Tc with increasing La concentration.
S. Suttiruengwong and W. Sricharussin
P. Siriprapa et al., "Effects of La-Dopant on Phase, Microstructure and Dielectric Properties of Bi4Ti3O12 Ceramics", Advanced Materials Research, Vols. 93-94, pp. 251-254, 2010