Ba-hexaferrite has been prepared by mechanical alloying and subsequent heat treatment. Powders were studied by X-ray diffraction, transmission electron microscopy, Mossbauer spectroscopy and magnetic measurements. High coercivities of up to 6 kOe were measured for these fine-particle materials.
Ding, J., Yang, H., Miao, W. F., Mccormick, P., & Street, R. (1995). High Coercivity Ba-hexaferrite Prepared by Mechanical Alloying. Journal of Alloys and Compounds, 221, 70-73. https://doi.org/10.1016/0925-8388(94)01402-7