Structure origin of abnormal magnetic behavior of Fe-P-C amorphous alloys.

Graphical abstract Highlights • The abnormal magnetic behavior of Fe-P-C amorphous alloys is reproduced. • Synchrotron XRD was performed to seek the structure origin. • The large Fe-Fe bond length results in the high B S of Fe 80 P 13 C 7 alloy. Abstract The magnetic properties of a series of Fe-P-C amorphous alloys were investigated. Fe 80 P 13 C 7 shows the largest saturation magnetic flux density among all the Fe 80 P 20− x C x (x = 7–9) alloys, which is supported by the hyperfine field distribution. Synchrotron X-ray diffraction was performed to explore the underlying structure mechanism. It is found that Fe 80 P 13 C 7 amorphous alloy has a larger atomic volume accompanied by a larger first peak position value of the reduced pair distribution function compared with those of Fe 80 P 12 C 8 and Fe 80 P 11 C 9. The origin of the unusual magnetic behavior of Fe 80 P 13 C 7 is thought to be the large Fe-Fe bond length. [ABSTRACT FROM AUTHOR]