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

doi:10.1007/s40195-015-0263-3

金属学报英文版 ›› 2015, Vol. 28 ›› Issue (6): 781-786.DOI: 10.1007/s40195-015-0263-3

收稿日期:2014-11-20 修回日期:2015-01-30 出版日期:2015-03-22 发布日期:2015-07-23

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

Nai-Kun Sun¹(), Jie Guo¹, Sheng-Jie Du¹, Song-Ning Xu¹, Ping-Zhan Si², Jin-Jun Liu³

(1)School of Science, Shenyang Ligong University, Shenyang, 110159, China
(2)College of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China
(3)Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China

Received:2014-11-20 Revised:2015-01-30 Online:2015-03-22 Published:2015-07-23

摘要/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

. [J]. 金属学报英文版, 2015, 28(6): 781-786.

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.

图/表 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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