Improvement of dielectric properties in iron-containing ferroelectrics

Iron-containing ferroelectrics tend to exhibit large dielectric loss accompanied by strong frequency dispersion of the dielectric properties, which is considered to correlate with the partial reduction of Fe(3+) to Fe(2+) ions during sintering. After sintering in an O(2) atmosphere, MnO(2) and Li(2)CO(3) dopings exhibit superior behavior in decreasing the dielectric loss of the iron-containing dielectrics. The strong frequency dispersion of the dielectric response and the abnormally recurrent increase of the dielectric constant and loss in the paraelectric region are correspondingly suppressed. An electron compensation mechanism is advanced to interpret the reason for the improvement in dielectric properties in the iron-containing dielectrics, in which the generation of donor electrons is based on different ionization paths.