Jayasuriya, K.D.Kaczmarek, W.A.Wu, E.Campbell, S.J.2014-11-192014-11-1919940304-3843 (print version),1572-9540 (electronic version)http://repository.kln.ac.lk/handle/123456789/4092The effects of dry-milling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by X-ray diffraction and M�ssbauer effect measurements. The sizes of the BaFe12O19 particles decrease on milling, as expected, although a partial decomposition of BaFe12O19 to ?-Fe2O3 is found to take place on extended milling (1000 h). The room temperature M�ssbauer spectra are consistent with superparamagnetic relaxation associated with the fine BaFe12O19 and ?-Fe2O3 particles. The X-ray diffraction patterns of all the milled samples exhibit features indicative of a disordered structural state, consistent with the nanoscale particles and a nanostructured state.X-raysMeasure theoryArticlePhysics