Structural, Dielectric, and Magnetic Properties of Ba-Doped Multiferroic Bismuth Ferrite

doi:10.1007/s40195-015-0279-8

Abstract

Abstract:

The main focus of the research was to correlate the microstructure with dielectric and magnetic properties of Bi_1-xBa_xFeO₃ samples. Bi_1-xBa_xFeO₃ samples (x = 0.1, 0.2 and 0.3) were synthesized by the conventional solid-state reaction method using nano-powders of Bi₂O₃, Fe₂O₃, and BaCO₃. Thereafter, field emission scanning electron microscope and X-ray diffraction (XRD) techniques were used to examine the structure and phase of the samples. Phase analysis by XRD indicated that the single-phase perovskite structure was formed with possible increment in lattice parameter with increasing Ba doping. Complex permeability $μ i'$ and $μ i''$ measured using impedance analyzer confirmed the increase in magnetic property with increasing Ba doping. Finally, dielectric constant (k) was analyzed as a function of temperature at different frequencies. Dielectric constant as high as 2900 was attained in this research for Bi_0.8Ba_0.2FeO₃ sample due to reduction in leakage current at this composition.

Key words: Multiferroic, Bismuth, ferrite, Dielectric, Complex, permeability

Rubayyat Mahbub, Takian Fakhrul, Md. Fakhrul Islam, Mehedi Hasan, Arman Hussain, M.A. Matin, M.A. Hakim. Structural, Dielectric, and Magnetic Properties of Ba-Doped Multiferroic Bismuth Ferrite[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(8): 958-964.

Figures/Tables 5

Table 1 Optimum sintering conditions for Bi1-x Ba x FeO3 samples (x = 0.1, 0.2 and 0.3)

Composition	Optimum sintering condition		Relative density (%)	Average grain size (µm)
Composition	Sintering temperature (°C)	Holding time (h)	Relative density (%)	Average grain size (µm)
Bi_0.9Ba_0.1FeO₃	850	1	>95	1.0-1.1
Bi_0.8Ba_0.2FeO₃	875	2	>95	0.95-1.0
Bi_0.7Ba_0.3FeO₃	875	4	>95	0.95-1.0

Fig. 1 FESEM micrograph of Bi1-x Ba x FeO3 samples: a x = 0.1, b x = 0.2, c x = 0.3 Figure 2 shows the XRD patterns of the Bi1-x Ba x FeO3 (x = 0.1, 0.2 and 0.3) samples at room temperature. All the samples show a single-phase perovskite structure which implies that the doping does not lower the stabilization of BiFeO3.

Fig. 2 XRD pattern of Bi1-x Ba x FeO3 samples (x = 0.1, 0.2 and 0.3)

Fig. 3 Initial complex permeability spectra for Bi1-x Ba x FeO3 (x = 0.1, 0.2 and 0.3) samples

Fig. 4 Variation of dielectric constant (k) with temperature at different frequencies for Bi1-x Ba x FeO3 samples: a x = 0.1, b x = 0.2, c x = 0.3

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