Synthesis and Magnetocaloric Properties of Ni-Co-Zn Nano Ferrites†

doi:10.7503/cjcu20150952

Abstract

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

CLC Number:

O614

TrendMD:

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

Figures/Tables 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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