Preparation and characterization of PbFe12−xGaxO19 single crystals

The single crystals of the magnetoplumbite type of the general formula Pb_12?xGa_xO₁₉ were prepared by the growing from lead oxide flux. The deviations from the ideal compositions are explained by the substitution of S and/or T blocks into the … SRS1R1SR … chains. The structural and magnetic study show on the change of the substitution mechanism of small metallic ions at x = 3. The last member of the serie was found the composition of x = 10.38. The limited mutual substitution of iron and gallium ions is probably caused by an unwillingness of gallium ions to enter into five-fold sites.