Anomalous dielectric losses in manganese doped lead-titanate-zirconate-ceramics

Lead-titanate-zirconate ceramics doped with a Mn mole fraction of about 0.5 to 2% show anomalous dielectric losses. For samples with high dielectric losses an anomalous behavior of loss tangent measured during cycling a hysteresis loop is also found. These effects can be understood in terms of local conductivity near grain boundaries which is correlated to manganese doping.