Abstract
Phase transitions in Bi4-xLaxTi3O12 (BLT-x) mixed crystals with a low La concentration (x<0.66) were investigated by measuring the dielectric constant and hysteresis loop, and carrying out differential thermal analysis (DTA) and domain wall observations. It was found in BLT-x that the triggered transition, i.e., the tetragonal–monoclinic transition observed in Bi4Ti3O12 (BiT, BLT-0), splits into two transitions, i.e., the tetragonal–orthorhombic and orthorhombic–monoclinic transitions, with the addition of La ions. The temperature of the tetragonal–orthorhombic transition remains unchanged at about 673 °C, whereas that of the orthorhombic–monoclinic transition strongly depends upon the La concentration in the range of 0≤x≤0.66. The phase transitions and their symmetry changes were discussed on the basis of the Landau theory.
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