IMF2017

Ferroelectricity in barium titanate (BT) has already been studied for more than 70 years. Still this material attracts a lot of attention because some of its properties are not quite well understood. It is also important from the application point of view. Most of the recent studies are concentrated on the doping of barium titanate with various ions. A lot of studies are concentrated on the rare-earth metal ion doping. Such kind of lattice substation can affect the properties of BT quite drastically. The addition of different ions can lead to very complex behaviour. One of the best examples is the mixtures between barium titanate and barium zirconate. This system shows very complicated crossover in the phase diagram between ferroelectric, relaxor and incipient ferroelectric phases. This study is devoted to the investigation of broadband dielectric spectroscopy of barium titanate doped with different concentration of cerium ions. The investigation was carried in a broad temperature (50 - 500 K) and frequency range (5 mHz – 1 GHz). The study shows that the increase of Cerium dopants in the B-site of perovskite lattice diminishes ferroelectric order and the relaxor behaviour is enhanced. It resembles barium zirconate titanate (BZT) system but the random fields supposed to be much stronger in the case of BT doped with Ce⁴⁺ at the Ti site. The evolution of temperature and frequency dependences of dielectric permittivity will be discussed in this contribution.