The perturbed angular correlation /P.A.C./ technique is employed to investigate the structures of barium ferrite and barium hexaferrite using radioactive133Ba /10.7 Y/ as a probe. The quadrupole interaction frequencies /WQ'S/ are found to be 9.68 and 12.02 Mrad sec–1 for barium ferrite and barium hexaferrite, respectively, showing a drift from usual cubic structure.