Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying

Table 1

Crystal structure, cell parameters, microstrain, and grain size from Rietveld refinement.

Composition FeCo	Crystal structure/space group	% vol.	Cell parameter(s), (, , ) (Å)	rms, microstrain	Grain size (nm)
Fe90Co10	bcc/Im-3m	100	2.86	0.0035	294
Fe80Co20	bcc/Im-3m	100	2.87	0.0036	265
Fe70Co30	bcc/Im-3m	100	2.86	0.0039	286
Fe60Co40	bcc/Im-3m	100	2.87	0.0040	261
Fe50Co50	bcc/Im-3m	50.3	2.85	0.0076	168
	bcc/Im-3m	49.7	2.86	0.0052	2520
Fe40Co60	bcc/Im-3m	100	2.84	0.0041	234
Fe30Co70	Fe-bcc/Im-3m	51.6	2.88	0.0001	165
	Co P63/mmc	48.4	2.51, 2.51, 4.07	0.0176	967
Fe20Co80	Fe-bcc/Im-3m	49.8	2.89	0.0062	103
	FeCo bcc/Pm-3m	50.2	2.84	0.0029	96
Fe10Co90	Fe-bcc/Im-3m	45.1	2.897	0.00005	102
	Fe P63/mmc	46.1	2.35, 2.35, 3.81	0.01767	892
	Co Fm-3m	7.6	3.54	0.00482	977
	Co P21 ma	1.2	7.94, 7.9, 15.3	0.00029	1000
Co, Fe	Fe-bcc/Im-3m	6.7	2.86	0.00063	2000
	Co P63/mmc	43.3	2.51, 2.51, 4.07	0.00012	240
	Fe Fm-3m	7.2	3.54	0.00213	3209
	Fe-bcc/Im-3m	42.7	2.86	0.00086	3117