Magnetic/Magnetostrictive Properties Together with Resistivity and Corrosion Behaviors of CoFe2 and Its Composite with CoFe2N

doi:10.1016/j.jmst.2016.07.006

Abstract

Abstract:

The CoFe₂ alloy (CF) was prepared by reducing CoFe₂O₄ in the H₂ ambient. Subsequently the CF sample was nitrided in the NH₃ atmosphere to produce the composite of CoFe₂N and CoFe₂. The magnetostriction, thermal expansion, resistivity and corrosion resistance of CF sample and the nitrided sample (CFN) at 1000 °C were investigated. The saturation magnetostriction coefficiency λ_s and thermal expansion coefficient α at 300 K for the nitrided CFN were 50 ppm and 10 ppm/K, respectively, approximately equal to those for the CF sample. However, compared with CF, CFN presents a decrease in temperature coefficient R_λ (300 K) of magnetostriction by ~11%. The smaller resistivity and improved corrosion resistance in the H₂SO₄ solution may expand the applications of the CoFe₂ in the fields needing lower resistivity or in the acidic environment.

Key words: CoFe alloy, CoFe₂N alloy, Magnetostriction, Resistivity, Corrosion resistance

Geng B.Q., Ma Y.Q., Wang M., Ding Z.L., Song W.H., Zhao B.C.. Magnetic/Magnetostrictive Properties Together with Resistivity and Corrosion Behaviors of CoFe₂ and Its Composite with CoFe₂N[J]. J. Mater. Sci. Technol., 2017, 33(7): 744-750.

Figures/Tables 13

Fig. 1. XRD patterns of the samples CFO (a), CF (c) and the JCPDS cards for CoFe2O4 (No. 22-1086) (b) and CoFe2 (No. 65-4131) (d).

Fig. 2. XRD patterns of the samples after the CoFe2 alloy was annealed in NH3 at temperatures 400 (b), 600 (c), 800 (d), 850 (e), 900 (f), 950 (g) and 1000 °C (h) together with the JCPDS cards of CoFe2 (No. 65-4131) (a) and Fe3N (No. 76-0091) (i).

Fig. 3. Diffraction intensity ratio between reflections of Fe3N phase (111) and CF (110) crystal planes for samples annealed in NH3 at temperatures of 600, 800, 850, 900, 950 and 1000 °C.

Fig. 4. XPS spectra of samples CFO, CF and CFN around Co 2p core level (a), Fe 2p core level (b) and N 1s core level (c).

Fig. 5. HRTEM image with the inset being the SAED patterns for the samples CFO (a) and CF (b); HRTEM image (c) and SAED pattern (d) for the CFN sample.

Fig. 6. M(H) loops for the sample CF and the samples annealed in NH3 at temperatures of 400, 600, 800, 850, 900, 950 and 1000 °C.

Fig. 7. FC (solid circles) and ZFC (empty circles) curves for the samples CFN (a), CF (b) and CFO (c).

Fig. 8. Magnetostriction as a function of magnetic field at different measuring temperatures of 10, 50, 200, 300 and 360 K for CF (a) and CFN (b).

Fig. 9. Saturation magnetostriction λs for CF and CFN as a function of temperature with the solid lines being the fitting curves.

Fig. 10. Linear thermal expansion ΔL/L for samples CF and CFN. Inset shows the thermal expansion coefficient α.

Fig. 11. The temperature dependence of resistivity for samples CF and CFN.

Fig. 12. The fitting and experimental resistivity curves in the low (a) and high (b) temperature regions for samples CF and CFN.

Fig. 13. SEM images of CFN before corrosion in H2SO4 (a), and low (b) and high (c) magnification for corroded CFN in H2SO4 for 24 h.

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Magnetic/Magnetostrictive Properties Together with Resistivity and Corrosion Behaviors of CoFe₂ and Its Composite with CoFe₂N

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