镍钴锌纳米铁氧体的制备及磁热性能

doi:10.7503/cjcu20150952

摘要/Abstract

摘要：

以乙酰丙酮盐为前驱体, 三乙二醇为溶剂, 采用多元醇法制备了纳米Ni_0.5-_xCo_xZn_0.5Fe₂O₄(x=0, 0.1, 0.2, 0.3和0.4)铁氧体. 通过X射线衍射仪(XRD)、透射电子显微镜(TEM)、傅里叶变换红外光谱仪(FTIR)和振动样品磁强计(VSM) 等对样品的结构、形貌和磁性能进行了表征. 结果表明, 所得纳米Ni_0.5-_xCo_xZn_0.5Fe₂O₄铁氧体的分散性较好, 尺寸均一. 在室温下产物的剩磁和矫顽力均较小, 表现出亚铁磁性. 纳米Ni_0.3Co_0.2Zn_0.5Fe₂O₄铁氧体的饱和磁化强度达到41.34 A·m²·kg^-1, 其在交变磁场中升温可达到55 ℃, 表现出较好的磁热性能.

关键词: 分散性, 多元醇法, 镍钴锌纳米铁氧体, 磁热性能

Abstract:

Ni_0.5-_xCo_xZn_0.5Fe₂O₄ nanoferrites(x=0, 0.1, 0.2, 0.3 and 0.4) were synthesized via polyol process using triethylene glycol as the solvent and acetylacetonate metal salts as precursors. The structure, morphology and magnetic properties of the resultant particles were characterized by means of X-ray diffraction(XRD), transmission electron microscopy(TEM), Fourier transform infrared spectrometry(FTIR) and vibrating sample magnetometry(VSM). The results show that Ni-Co-Zn nanoferrites have uniform size and good dispersibility. The monodisperse Ni_0.5-_xCo_xZn_0.5Fe₂O₄ nanoferrites show a typical ferrimagnetic behavior at room temperature. The Ni_0.3Co_0.2Zn_0.5Fe₂O₄ nanoferrites have maximum saturation magnetization of 41.34 A·m²·kg^-1. The temperature of Ni_0.3Co_0.2Zn_0.5Fe₂O₄ nano ferrites suspension can reach up to 55 ℃ in alternating magnetic field, which reveals its sufficient magnetocaloric properties.

Key words: Dispersibility, Polyol process, Ni-Co-Zn Nano ferrite, Magnetocaloric property

中图分类号:

O614

TrendMD:

赵海涛, 王俏, 刘瑞萍, 马瑞廷. 镍钴锌纳米铁氧体的制备及磁热性能. 高等学校化学学报, 2016, 37(4): 613.

ZHAO Haitao, WANG Qiao, LIU Ruiping, MA Ruiting. Synthesis and Magnetocaloric Properties of Ni-Co-Zn Nano Ferrites^†. Chem. J. Chinese Universities, 2016, 37(4): 613.

图/表 8

Fig.1 TEM images of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles^ (A) x=0; (B) x=0.1; (C) x=0.2; (D) x=0.3; (E) x=0.4.

Fig.2 Particle size histograms of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles^ (A) x=0; (B) x=0.1; (C) x=0.2; (D) x=0.3; (E) x=0.4.

Table 1 Characteristic parameters of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles

x	Formula	a/nm	I₂₂₀/I₄₂₂
0	Ni_0.5Zn_0.5Fe₂O₄	0.8375	2.03
0.1	Ni_0.4Co_0.1Zn_0.5Fe₂O₄	0.8386	2.05
0.2	N $i 0 . 3$ Co_0.2Zn_0.5Fe₂O₄	0.8391	2.66
0.3	Ni_0.2Co_0.3Zn_0.5Fe₂O₄	0.8399	2.50
0.4	Ni_0.1Co_0.4Zn_0.5Fe₂O₄	0.8410	2.08

Table 1 Characteristic parameters of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles

x	Formula	a/nm	I₂₂₀/I₄₂₂
0	Ni_0.5Zn_0.5Fe₂O₄	0.8375	2.03
0.1	Ni_0.4Co_0.1Zn_0.5Fe₂O₄	0.8386	2.05
0.2	N $i 0 . 3$ Co_0.2Zn_0.5Fe₂O₄	0.8391	2.66
0.3	Ni_0.2Co_0.3Zn_0.5Fe₂O₄	0.8399	2.50
0.4	Ni_0.1Co_0.4Zn_0.5Fe₂O₄	0.8410	2.08

Fig.3 XRD patterns of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles(A) and the shifting in 2θ of (311) plane with increasing Co concentration(B)^a. x=0; b. x=0.1; c. x=0.2; d. x=0.3; e. x=0.4.

Fig.4 FTIR spectrum of Ni0.3Co0.2Zn0.5Fe2O4 nanoparticles

Fig.5 Magnetic hysteresis loop of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles at room temperature^ (A) x=0; (B) x=0.1; (C) x=0.2; (D) x=0.3; (E) x=0.4.

Table 2 Main magnetic parameters of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles

Formula	M_s/(A·m²·kg^-1)	M_r/(A·m²·kg^-1)	H_c/(kA·m^-1)	n_B/μ_B
Ni_0.5Zn_0.5Fe₂O₄	29.38	1.03	5.25	1.26
Ni_0.4Co_0.1Zn_0.5Fe₂O₄	37.58	1.50	4.33	1.60
Ni_0.3Co_0.2Zn_0.5Fe₂O₄	41.34	1.52	5.67	1.76
Ni_0.2Co_0.3Zn_0.5Fe₂O₄	40.93	1.27	4.01	1.71
Ni_0.1Co_0.4Zn_0.5Fe₂O₄	37.05	1.65	4.58	1.58

Fig.6 Temperature-time of Ni0.5-xCoxZn0.5Fe2O4 nanoparticles^a. x=0; b. x=0.4; c. x=0.1; d. x=0.3; e. x=0.2.

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