Ferroelectricity in (Hf, Zr)-doped barium titanate ceramics

Ferroelectric properties of 9% mol (Hf, Zr) - doped BaTiO sub(3) ceramics are studied by comparison with those of tetragonal pure BaTiO sub(3) ceramics. A shift of the rhombohedral-orthorhombic and orthorhombic-tetragonal transition temperatures above 0 degree C and a decreasing of tetragonal-cubic transition temperature from 122 degree C to 95 degree C on heating and from 120 degree C to 85 degree C on cooling is observed in doped BaTiO sub(3) ceramics. Ageing of low field dielectric constant and losses in doped ceramics depends on temperature according to the phase symmetry.