Observation of anomalous EPR lines with intermediate g-factor in BaKBiO and BaPbBiO systems

The Ba1−xKxBiO3 and BaPbyBi1−yO3 systems were studied by the EPR method in wide ranges of doping levels. Besides the signals with factors g≈2.1 and g≈4.2 the anomalous EPR lines with intermediate g-factors (g≈3) were also found in the both systems. The reason of such lines is local lattice distortions (“lattice defects”) with appropriate magnetic moments resulting due to disorderings (“electron defects”) in ordered covalent bonds Bi–O.