Synthesis and enhancement of multiferroic properties of (x)Ba0.95Sr0.05TiO3–(1−x)BiFe0.90Dy0.10O3 ceramics

Miah, M.J.; Khan, M. N. I.; Hossain, A.K.M. Akther

doi:10.1016/j.jmmm.2015.08.079

Cited by 36 publications

(4 citation statements)

References 54 publications

(48 reference statements)

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“…They are divided into two classes: single phase and composite. However, the single-phase multiferroic materials are rarely found in nature which shows the ferroelectric (FE) and FM properties concurrently [5]. Among all the multiferroic materials known today, bismuth ferrite (BiFeO 3 ; BFO) is one of the single-phase materials that have a rhombohedral distorted perovskite lattice type with polar space group R3c .…”

Section: Introductionmentioning

confidence: 99%

Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Al-Doped BiFeO3 Powders

et al. 2019

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The Al-doped BiFeO 3 , i.e., BFA x O powder samples with x = 0, 0.025, 0.05, and 0.1, were prepared via the hydrothermal route. The effects of Al substitution on the structural, electrical, and optical properties of BFA x O samples were investigated. It is found that the substitution of Al ions at B-site of BiFeO 3 did not cause structural change and it still retains the rhombohedral perovskite structure with R3c symmetry, which was confirmed by the X-ray diffraction (XRD) and Raman measurements. X-ray absorption fine structure (XAFS) above the Fe K -edge and Bi L 3 -edge in BFA x O powders was also measured and analyzed. Fe ions exhibit mixed valence states (Fe 2+ /Fe 3+ ) while Bi ions keep the + 3 valence state in all the samples. Fe K -edge XAFS also indicated that there was a competition between hybridization of Fe 3 d and Al 3 d with O 2 p orbitals and occurrence of the more 4 p orbitals with Al doping. The Bi L 3 -edge XAFS revealed that transition from 2 p 3/2 to 6 d state increased, so did the energy of 6 d state. Besides, Al ion doping affected both the nearest-neighbor and next-nearest coordination shells of Fe atom and nearest-neighbor shells of Bi atom. Ultraviolet-visible (UV-Vis) spectroscopy results show the BFA x O prepared by hydrothermal method could be an appropriate visible-light photocatalytic material.

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Section: Introductionmentioning

confidence: 99%

Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Al-Doped BiFeO3 Powders

et al. 2019

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“…Moreover, the substitution of BFGO by BST makes a change in bonding among the elements which causes the change in inter atomic distance and expansion of the unit cell volume and reduces the density [9]. The effect of sintering temperature (T s ) on the change of B ρ is shown in Figure 2(b) and it is seen that B ρ increases with the increase in sintering temperatures.…”

Section: Densitymentioning

confidence: 99%

Sintering Temperature Dependent Magnetic and Dielectric Properties of Polycrystalline xBa0.95Sr0.05TiO3-(1 - x)BiFe0.90Gd0.10O3 Ceramics

Miah¹,

Mouri²,

Ahad³

et al. 2020

JAMP

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Polycrystalline xBa 0.95 Sr 0.05 TiO 3 -(1 − x)BiFe 0.90 Gd 0.10 O 3 ceramics were prepared by standard solid state reaction technique using the solid solution of BaCO 3 , SrCO 3 , TiO 2 , Bi 2 O 3 , Fe 2 O 3 and Gd 2 O 3 . The compound is a BiFeO 3 based multiferroic material which contains both magnetic and electric properties. The synthesized ceramics noticed better properties than xBaTiO 3 -(1 − x)BiFeO 3 because of adding rare earth element Gd which have higher magnetic moment than Fe. The prepared samples were sintered at 900˚C, 950˚C and 1000˚C for 1 h. The effect of sintering temperature on density of the compound, complex initial permeability, dielectric properties and complex impedance analysis was reported in this article. Density of the ceramics was found to be enhanced with the rise in sintering temperature which implied porosity of the compound decreased when sintering temperature was increased. Enhanced complex initial permeability was noticed for the samples up to 950˚C and this might be attributed to reducing the motion of domain wall when the ceramics were sintered above 950˚C. Value of dielectric constant increased whereas dielectric loss decreased and these modifications might be expected because of changing density and grain size due to the variation of sintering temperature. Grain resistance (resistance due to grains) was determined from complex impedance analysis and it reduced with the rise in sintering temperature. The studied multiferroic material exhibited weak ferromagnetism but is an alternative product of environmental hazard lead (Pb) based multiferroic material and it is expected to be environment friendly.

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“…The magnetic and dielectric properties at room temperature are highly altered and even multiferroicity is reported. [33][34][35] Thus, observing the dielectric properties of BaTiO 3 doped with Sm 3+ or Gd 3+ is aimed not only the megahertz regime, but also extending to the terahertz regime. Furthermore, Over the last few years, considerable attempts have been directed towards examination new material and optical elements for the THz regime, 36 due to it numerous application such as biomedical imaging and spectroscopy wireless communications.…”

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confidence: 99%

“…The latter represents the onset of the plateau, and usually interpreted as the rate with which the ions escape from their local entrapment (a Coulombic 'cage). 33,70 The data are collapsed in a good master curve, 71 i.e., the FTS holds well (cf. inset in Fig.…”

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confidence: 99%

Synthesis of Sm³⁺ and Gd³⁺ Ions Embedded in Nano-Structure Barium Titanate Prepared by Sol-Gel Technique: Terahertz, Dielectric and Up-Conversion Study

Hameed

Mohamed

Mansour

et al. 2020

ECS J. Solid State Sci. Technol.

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Nano-structure Barium Titanate (BaTiO3) doped with 1 mole% Sm3+ and Gd3+ ions have been synthesized by modified sol-gel process. The tetragonal perovskite structure has been demonstrated by means of X-ray diffraction and selected area electron diffraction obtained by high resolution transmission microscopy. The XRD and HRTEM have been used for estimation the grain size, which found to be around 38.36 and 33.26 nm. The scanning electron microscope micrographs asserted the formation of agglomerated particles, which is characteristic of many nano-systems. The green emission has been observed at 528, 567 and 597 nm, whereas red group emission at 604, 611, 632, 643, 660, 672, 688, 716 and 732. The thermal stability and the purity of the synthesized material were confirmed by the results of Thermogravimetric Analysis (TGA) and differential scanning calorimetry (DSC). Two relaxation processes were observed in the dielectric loss εʹ as well as in the modulus spectra of both samples. The dielectric behavior was further discussed in the range of terahertz by using the time domain terahertz spectrophotometer. the refractive index in terahertz were found to be dwindle, whereas the absorption coefficient improved upon increasing THz frequencies.

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Synthesis and enhancement of multiferroic properties of (x)Ba0.95Sr0.05TiO3–(1−x)BiFe0.90Dy0.10O3 ceramics

Cited by 36 publications

References 54 publications

Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Al-Doped BiFeO3 Powders

Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Al-Doped BiFeO3 Powders

Sintering Temperature Dependent Magnetic and Dielectric Properties of Polycrystalline xBa<sub>0.95</sub>Sr<sub>0.05</sub>TiO<sub>3</sub>-(1 - x)BiFe<sub>0.90</sub>Gd<sub>0.10</sub>O<sub>3</sub> Ceramics

Synthesis of Sm³⁺ and Gd³⁺ Ions Embedded in Nano-Structure Barium Titanate Prepared by Sol-Gel Technique: Terahertz, Dielectric and Up-Conversion Study

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Synthesis and enhancement of multiferroic properties of (x)Ba0.95Sr0.05TiO3–(1−x)BiFe0.90Dy0.10O3 ceramics

Cited by 36 publications

References 54 publications

Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Al-Doped BiFeO3 Powders

Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Al-Doped BiFeO3 Powders

Sintering Temperature Dependent Magnetic and Dielectric Properties of Polycrystalline xBa&lt;sub&gt;0.95&lt;/sub&gt;Sr&lt;sub&gt;0.05&lt;/sub&gt;TiO&lt;sub&gt;3&lt;/sub&gt;-(1 - x)BiFe&lt;sub&gt;0.90&lt;/sub&gt;Gd&lt;sub&gt;0.10&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Ceramics

Synthesis of Sm3+ and Gd3+ Ions Embedded in Nano-Structure Barium Titanate Prepared by Sol-Gel Technique: Terahertz, Dielectric and Up-Conversion Study

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Sintering Temperature Dependent Magnetic and Dielectric Properties of Polycrystalline xBa<sub>0.95</sub>Sr<sub>0.05</sub>TiO<sub>3</sub>-(1 - x)BiFe<sub>0.90</sub>Gd<sub>0.10</sub>O<sub>3</sub> Ceramics

Synthesis of Sm³⁺ and Gd³⁺ Ions Embedded in Nano-Structure Barium Titanate Prepared by Sol-Gel Technique: Terahertz, Dielectric and Up-Conversion Study