Influence of High-Pressure Nitrogenation on the Structure, Magnetism and Microwave Absorption Properties of SmFe10Mo2

doi:10.1007/s40195-015-0263-3

Abstract

Abstract:

Nitrogenation of SmFe₁₀Mo₂ powders was performed in a self-made furnace under a high-purity N₂ atmosphere up to 40 MPa at 500 °C. Upon nitrogenation at atmospheric pressure, the lattice parameters a and c increase by 0.5% and 2.7%, respectively, whereas the Curie temperature T _C increases from 519 to 633 K. With further increasing the nitrogenation pressure to 20 and 40 MPa, the 1:12 main phase starts to decompose and a large amount of Mo and α-Fe precipitates. This leads to variation of Mo concentration in the 1:12 phase and causes a sharp decrease in T _C and in the coercivity. The relative complex permittivity and permeability of paraffin-SmFe₁₀Mo₂ composites show multi-resonant behavior. After nitrogenation, the magnetic loss of the powders decreases, which may originate from the influence of eddy currents due to the increase in the particle size.

Key words: High-pressure, nitrogenation, SmFe10Mo2-based, compounds, Curie, temperature, Microwave, absorption

Nai-Kun Sun, Jie Guo, Sheng-Jie Du, Song-Ning Xu, Ping-Zhan Si, Jin-Jun Liu. Influence of High-Pressure Nitrogenation on the Structure, Magnetism and Microwave Absorption Properties of SmFe₁₀Mo₂[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(6): 781-786.

Figures/Tables 7

Fig. 1 XRD patterns of bulk SmFe10Mo2 (sample A), milled SmFe10Mo2 powder (sample B), the nitrogenized SmFe10Mo2 powders under 0.1 MPa (sample C), 20 MPa (sample D), 40 MPa (sample E)

Table 1 Structural data of the SmFe10Mo2 powder and its nitrides

Samples	a (Å)	c (Å)
B	8.54	4.784
C	8.594	4.914
D	8.600	4.929
E	8.601	4.931

Fig. 2 SEM images and EDS results of sample C nitrogenized at 0.1 MPa a, b, sample E nitrogenized at 40 MPa c, d

Fig. 3 Temperature dependence of the magnetization at 0.05 T a, magnetic hysteresis loop at room temperature b of the samples

Table 2 Magnetic features of SmFe10Mo2 and its nitrides

Samples	M _s (Am²/kg)	H _cj (T)	T _C (K)
A	60.3	0.04	543
B	50.2	0.12	519
C	74.1	0.04	633
D	69.1	0.019	417
E	67.8	0.018	407

Fig. 4 Frequency dependence of the relative permittivity a, c, the relative permeability b, d of SmFe10Mo2 and its nitride dispersed in paraffin

Fig. 5 Frequency dependence of the reflection loss of sample A a, sample C b dispersed in paraffin

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Influence of High-Pressure Nitrogenation on the Structure, Magnetism and Microwave Absorption Properties of SmFe₁₀Mo₂

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