Effects of bismuth donor doping on the phase structure and the magnetic and ferroelectric properties of Fe-doped BaTiO3

We study the crystal structure and the magnetic properties of Ba1−xBixTi0.9Fe0.1O3 (0 ≤ x ≤ 0.12) ceramics prepared by using a conventional solid-state reaction. X-ray diffraction and Raman scattering spectroscopy measurements show that Bi 3+ substitution suppresses the formation of the hexagonal BaTiO3 phase and stabilizes the tetragonal BaTiO3 phase. The samples with x ≥ 0.08 demonstrate a single tetragonal BaTiO3 phase. Samples with x ≤ 0.1 show obvious magnetic orders at room temperature. The saturated magnetization, paramagnetic contribution and magnetic transition temperature are found to depend on the Bi doping concentration. Samples with 0.08 ≤ x ≤ 0.1 show a single tetragonal phase structure with a ferromagnetic order. These results indicate that the crystal structure and the ferromagnetic properties of Ba1−xBixTi0.9Fe0.1O3 (0 ≤ x ≤ 0.12) ceramics are intrinsic.

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“…[11]. Interestingly, Bi doping stabilized the tetragonal BaTiO 3 phase but suppressed the hexagonal BaTiO 3 phase in these series samples.…”

Section: Introductionmentioning

confidence: 85%

Modification of the ferromagnetic properties of Fe-doped BaTiO3 polycrystalline ceramics by using Bi3+ doping

Kim

Lee

2016

Journal of the Korean Physical Society

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“…And it has been reported that the substitution of Bi 3+ ions into the Ba 2+ sites (Ba 1 − x Bi x TiO 3 ) achieves a maximum dielectric constant at x = 0.05 12 . The structure of Ba 1 − x Bi x TiO 3 (x ≤ 0.1) was reported to be of a tetragonal phase 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Rietveld refinement and diffuse phases transition of Ba1-XBixTi0.8Fe0.2O3 ceramics at x=0.00, 0.05, 0.10 and 0.15 prepared by solid state method.

Gouitaa

Taj-dine

BOUAYAD

et al. 2020

Preprint

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The effect of substitution of Baryum by Bismut in site A and titanium by iron in site A on structural, physical and electrical properties of Ba1-xBixTi0.80Fe0.20O3 ceramics at (x=0.00, 0.05, 0.10 and 0.15) was investigated by X-ray diffraction, Scaning Electron Microscopy (SEM) as well as dielectric characterizations. The crystal phase was studied by using rietveld refinement. The result of rietveld refinement of X-ray powders diffraction of Ba1-xBixTi0.80Fe0.20O3 shows that these compounds crystallize in tetragonal (P4mm) and hexagonal (P63mmc) for x=0.00 and 0.05 while at x=0.10 and 0.15 the hexagonal phase disappears and the tetragonal phase is stabilized. The structural parameters and the R-factors of these ceramics were succefully determined by the rietveld refinement. The Raman spectra confirms the disappearance of hexagonal phase in benefit of tetragonal phase as the Bi substitution increases. The dielectric measurements as function of temperature are studied and showed tree diffuse phase transitions transition from the ferroelectric rhombohedral phase to the ferroelectric orthorhombic TR-O phase and the second one is from the ferroelectric orthorhombic phase to the ferroelectric TO-T tetragonal phase. While the third one at high temperatures is the phase transition from the ferroelectric tetragonal phase to the paraelectric cubic phase Tm. These phases transition were displaced to the lower temperature with increasing of Bi substitution. And the value of dielectric permittivity increases gradually with increasing of Bi2+ contents. All these phase transitions showed a diffused phenomenon which can be well described by fitting the modified Ushino relation, 1/ε’r = 1/ε’r,max [ 1+ ((T-Tm)/2δ)γ]. The complex impedance Cole–Cole plots showed negative temperature coefficient of resistivity (NTCR) behavior of the Ba1-xBixTi0.80Fe0.20O3 for x=0.05 to 0.15 materials and decrease in grain and grain boundaries resistivity. The relaxation behavior in the test materials is found to be of Debye type.

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Rietveld analysis and multiferroic properties of Fe doped Ba0.95Bi0.05TiO3 ceramics

Yansen

Kim

Parwanta

et al. 2015

Current Applied Physics

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Effects of bismuth donor doping on the phase structure and the magnetic and ferroelectric properties of Fe-doped BaTiO3

Cited by 3 publications

References 14 publications

Modification of the ferromagnetic properties of Fe-doped BaTiO3 polycrystalline ceramics by using Bi3+ doping

Modification of the ferromagnetic properties of Fe-doped BaTiO3 polycrystalline ceramics by using Bi3+ doping

Rietveld refinement and diffuse phases transition of Ba1-XBixTi0.8Fe0.2O3 ceramics at x=0.00, 0.05, 0.10 and 0.15 prepared by solid state method.

Rietveld analysis and multiferroic properties of Fe doped Ba0.95Bi0.05TiO3 ceramics

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