Barium titanate as a ferroelectric and piezoelectric ceramics

Barium titanate is a member of a large family of compounds with the general formula ABO3 called perovskites, as the crystal size of barium titanate increases and at critical crystalline size crystal structure of barium titanate transformed from cubic to tetragonal. Transformation of crystal structure is also take place at Curi temperature. Cubic structure show paramagenatic behavior while tetragonal is ferroelectric. Differant methods of synthesis result in to the different crystalline size of barium titanate crystal structure. In ferroelectric phase barium titanate provide its great importance in the field of technology and have an amount of application due to its excellent dielectric, ferroelectric and piezoelectric properties. In this review paper, a study on variation of critical crystalline size of barium titanate and its ferroelectric and piezoelectric behavior is presented.