Ferromagnetism borides

Braun, H.F., M. Pelizzone and K. Yvon, 1982, Ferromagnetic borides with incommensurate R- and Fe-sublattices R,.jFe4B4, paper presented at the 7th Intern. Conf. on Solid Compounds of Transition Elements, Grenoble (June 21-26), Proceedings, II Bll. 

Kue] Kuentzler, R., Specific Heat of Nearly Ferromagnetic Borides (Co-Ni)2B and (Fe-Co)B , J. Appl. Phys., 41(3), 908-909 (1970) (Crys. Structure, Experimental, Magn. Prop., 15) [1971Han] Hanson, B.D., Mahnig, M., Toth, L.E., Low Temperature Heat Capaeities of Transition Metal Borides , Z Naturforschung A, 26(4), 739-746 (1971) (Crys. Strueture, Experimental, Thermodyn., 28)... 

Most compounds with the Cu Al2 structure have a radius ratio of about 0.8. For Cu Alo, the radius ratio is 0.895. The borides BFe2 and BCo2, with the Cu Alo structure, are ferromagnetic. 

The ferromagnetic iron borides are often referred to as interstitial compounds because the boron atoms occupy interstices in an otherwise close-packed iron lattice. The internal fields at room temperature of Fe2B and FeB are 242 and 118 kG respectively compared with a value of 330 kG for iron itself [79, 80]. Data available concerning the detailed band structure of these compounds are consistent with 3i/-populations on the iron atoms of and... 

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