Structure and Magnetic Property of Fe and Mn Doped Spinel Co2MnO4

doi:10.15541/jim20160518

Abstract

Abstract:

Spinel solid solution Co_2-_xMn₁₊_xO₄ and Co_2-_xFe_xMnO₄ were synthesized by Sol-Gel method using metal nitrates and citric acid as the starting materials. Crystalline phases, structure and magnetic properties of the Co₂MnO₄doped with different concentrations of Fe and Mn were investigated by XRD、FT-IR and PPMS, respectively. Results show that Co_2-_xMn₁₊_xO₄ series are single-phase cubic spinel structure at x<0.6, the lattice parameter as well as the saturation magnetization are found to be increasing with the Mn content increasing. Co_2-_xMn₁₊_xO₄ series transform to tetragonal structure gradually at x≥0.6, which result in the decline of magnetic properties and difficulty of reaching saturation. Co_2-_xFe_xMnO₄ samples have cubic spinel structure at x<1.75, the lattice parameter and magnetic increase with the increase of Fe-substitution. When the Fe content increases to 1.75, Fe₂O₃phase is formed in the sample. The changes of performance are mainly due to the larger atom radius of the doping atoms (Fe or Mn) as compared to that of Co. And magnetic moment is another important factor to the performance change. The first-principles calculation results show that the magnetic moments of Fe and Mn are larger than that of Co. As a result, the interatomic magnetic interaction is enhanced by doping.

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Key words: spinel-type oxide, crystal structure, magnetic coupling

CLC Number:

TQ174

MENG Fan-Bin, MA Xiao-Fan, ZHANG Wei, WU Guang-Heng, ZHANG Yu-Jie. Structure and Magnetic Property of Fe and Mn Doped Spinel Co₂MnO₄[J]. Journal of Inorganic Materials, 2017, 32(6): 609-614.

Figures/Tables 7

Fig. 1 XRD patterns for Co2-xMn1+xO4 (x= 0, 0.5, 0.6, 1) (a); XRD patterns for Co2-xFexMnO4 (x= 0.25, 0.75, 1.50, 1.75), the impure phase peaks are marked with asterisks; (b) Detailed XRD patterns for Co2-xFexMnO4 (x= 0.25, 0.75, 1.50) showing the peak of (311) reflection (c). Inset shows the lattice parameter as a function of Fe content

Fig. 2 FT-IR spectra of Co2MnO4, Co1.7Fe0.3MnO4 and CoMn2O4 samples tested in 400-950 cm-1 Inset shows the testing range of 400-4000 cm-1

Fig. 3 Hysteresis loop for Co2-xMn1+xO4 (x=0, 0.5, 1.0) (a) and Co2-xFexMnO4 (x=0.25, 0.75, 1.50) (b) at the temperature of 5 K. Inset of them are the loops tested at room temperature

Table 1 Magnetic parameters for Co2-xMn1+xO4 and Co2-xFexMnO4 tested at 5 K

Co_2-_xMn₁₊_xO₄	M_S/(A∙m²∙kg^-1)	M_r/(A∙m²∙kg^-1)	H_C/T
x = 0	13.23	7.32	0.5421
x = 0.5	22.41	12.16	0.5427
Co_2-_xFe_xMnO₄	M_s/(A∙m²∙kg^-1)	M_r/(A∙m²∙kg^-1)	H_C/T
x = 0	13.23	7.32	0.5421
x = 0.25	41.61	19.91	0.2763
x = 0.75	66.78	37.36	0.2507
x = 1.50	77.97	64.83	0.7118

Fig. 4 Schematic of magnetic structure for Co2MnO4 (a); magnetic structure near the doped atoms for Co2-xMn1+xO4 (b) and Co2-xFexMnO4 (c)

Fig. 5 Temperature dependence of magnetization for Co2-xMn1+xO4 (x = 0, 0.5, 1.0) with the field of 0.1 T

Fig. 6 Lattice parameter and MS as a function of composition

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Structure and Magnetic Property of Fe and Mn Doped Spinel Co₂MnO₄

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