Correlation between structure, dielectric and multiferroic properties of lead free Ni modified BaTiO3 solid solution

Arshad, Mohd Khairuddin; Khan, Wasi; Abushad, M.; Nadeem, M.; Husain, Shahid; Ansari, A. A.; Chakradhary, Vishal Kumar

doi:10.1016/j.ceramint.2020.07.219

Cited by 66 publications

(16 citation statements)

References 54 publications

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“…Noticeably, the magnetization is reduced at a higher magnetic eld at x = 0.08 doping, which indicates diamagnetism. This may be due to the suppression of the exchange interaction energy at the higher magnetic elds [26,27]. The M-H hysteresis loops at high eld show a linear relationship at x = 0.1 doping, which indicates that there is some paramagnetic phenomenon.…”

Section: Resultsmentioning

confidence: 94%

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Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Zhang

Zhou

et al. 2021

Preprint

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In this work, we have investigated the structural, electrical, magnetic and optical properties of Ni-Nb co-doped BaTiO3 ceramics. The compositions of BaTi1 − x(Ni1/2Nb1/2)xO3 were prepared through conventional solid-state reaction method. All the samples exhibit a gradual phase transition behavior from the tetragonal to a cubic structure with the increase of Ni-Nb co-doping concentration. The temperature dependence of the dielectric constant reveals that the transition temperature gradually decreased with an increase in Ni2+ and Nb5+ concentrations. The ferroelectric studies show these doping samples have relatively full ferroelectric hysteresis loops at room temperature, but exhibit a decreasing ferroelectric property with the increasing level of doping. The magnetic measurement suggests that these samples have ferromagnetic ordering at room temperature with an increase in the Ni-Nb doping. Moreover, band gaps of these samples are obviously reduced through the strategy of co-doping.

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Section: Resultsmentioning

confidence: 94%

“…The M-H hysteresis loops at high eld show a linear relationship at x = 0.1 doping, which indicates that there is some paramagnetic phenomenon. The existence of some Ni 2+ ions which do not ferromagnetically couple with the oxygen vacancies results in paramagnetic behavior [26].…”

Section: Resultsmentioning

confidence: 99%

Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Zhang

Zhou

et al. 2021

Preprint

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“…e structural lattice parameters of barium titanate semiconductors doped with different materials and their corresponding bang gap employed for developing the proposed GSVR model are extracted from the literature [2][3][4][5][6][7][37][38][39][40]. Replacement of Ti 4+ ions in the parent barium titanate by the equivalent ions (say Sn 4+ ) from the dopants results in lower angle peak shifting with characteristic unit cell expansion due to ionic radii difference [41].…”

Section: Data Physical Description and Acquisitionmentioning

confidence: 99%

“…ere are two substitution sites associated with barium titanate which include Ba 2+ (referred to as A-site) and Ti 4+ site (called B-site) [5,7]. Codoping and doping into these mentioned sites lead to improved ferromagnetic and optical properties.…”

Section: Introductionmentioning

confidence: 99%

Barium Titanate Semiconductor Band Gap Characterization through Gravitationally Optimized Support Vector Regression and Extreme Learning Machine Computational Methods

Olatunji

Owolabi

2021

Mathematical Problems in Engineering

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Barium titanate (BaTiO3) is a class of ceramic multifunctional materials with unique thermal stability, prominent piezoelectricity constant, excellent dielectric constant, environmental friendliness, and excellent photocatalytic activities. These features have rendered barium titanate indispensable in many areas of applications such as electromechanical devices, thermistors, multilayer capacitors, and electrooptical devices. The photocatalytic activity of barium titanate semiconductor is hindered by its large band gap and high rate of charge recombination. Doping of the parent barium titanate compound for band gap tuning is challenging and consumes appreciable time and other valuable resources. This present work relates the influence of foreign material incorporation into the parent barium titanate with the corresponding energy band gap by developing extreme learning machine- (ELM-) based models and hybridization of support vector regression (SVR) with gravitational search algorithm (GSA) using the structural lattice distortion that emanated from doping as model descriptors. The developed gravitationally optimized SVR (GSVR) is characterized with a low value of mean absolute error (MAE), mean absolute percentage error (MAPE), and root mean square error (RMSE) of 0.036 ev, 1.145 ev, and 0.122 ev, respectively. The developed GSVR model outperforms ELM-Sine and ELM-Sig models using various performance evaluators. The developed GSVR model investigates the significance of iodine and samarium incorporation on the band gap of the parent barium titanate and the attained energy gaps conform excellently to the experimentally reported values. The demonstrated precision of the developed GSVR as measured from the closeness of its estimates with the measured values provides a quick and accurate method of energy gap characterization with circumvention of experimental stress and conservation of valuable time as well as other resources.

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“…Currently, the search for Lead-free dielectric ceramics with ergonomic properties is focused on the compositions of BaTiO3, which is a well-studied perovskite ferroelectric material due to its enormous practical applications [13,[18][19][20][21]. Modification in the structure and properties of BaTiO3 can be made by doping with a variety of dopant ions (dopant engineering) for fetching multiple applications from doped ceramic materials [5,15,20,[22][23][24][25][26][27]. The properties of ceramic materials are highly dependent on final crystal symmetry, choice of dopant, the disparity in ionic radii between host/parent and dopant cations, doping concentration, and preparation conditions [28] The A-site substitution of smaller ionic radii Ca 2+ (1.34 Å) in BaTiO3 is caused by replacing Ba 2+ ions with larger ionic radii (1.61 Å) within its solid solution limit.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Unraveling Dielectric Abnormality Based on the Effect of Defect Dipoles in Cr Ion Doped Multipurpose Properties of BCT Ceramics

Redhu

Sharma

Punia

et al. 2020

Preprint

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With the motive of unraveling the effect of Cr incorporation on the structural, microstructural, dielectric, ferroelectric, energy storage, and magnetic properties of BCT (Barium Calcium Titanate) ceramics have been investigated. Ba0.80Ca0.20Ti1-3x/4CrxO3 (0.000 ≤ x ≤ 0.020) powder samples have been prepared using classical solid-state reaction method. Cr doped BCT ceramics showed a single phase perovskite structure having a tetragonal phase without phase transformation from P4mm to Pm-3m after the addition of Cr. With increased Cr content, the tolerance factor, lattice parameters, unit cell volume, c\a ratio, and grain size have been found to decrease. Both Debye-Scherrer and Williamson-Hall plot methods confirmed the reduction of crystallite size on increased Cr doping in BCT lattice. A dielectric anomaly “hump” (̴ 447 K) has been observed at low frequencies in the paraelectric region due to the presence of acceptor induced defect dipoles. The temperature-dependent dielectric properties of prepared BCT ceramic with Cr compositions possess diffused phase transition (DPT) and the width of DPT is increased. Room temperature energy storage density achieved the maximum value of 190.35 mJ/cm3 for the composition x = 0.005 at an electric field of 55 kV/cm. For the Cr composition of x = 0.015 and an electric field of 10 kV/cm, the highest energy storage efficiency (η) of about 60.5 % has been obtained at room temperature. % Temperature coefficient of capacitance has been obtained to vary between ± 15 % in the temperature range of 303 K to 523 K. Cr doped ceramic samples exhibit room temperature ferromagnetism at low magnetic fields and diamagnetism at a higher value of magnetic fields. These results suggest prepared ceramics as a suitable lead-free material for X8R multilayer ceramic capacitor devices and energy applications.

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Correlation between structure, dielectric and multiferroic properties of lead free Ni modified BaTiO3 solid solution

Cited by 66 publications

References 54 publications

Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Barium Titanate Semiconductor Band Gap Characterization through Gravitationally Optimized Support Vector Regression and Extreme Learning Machine Computational Methods

WITHDRAWN: Unraveling Dielectric Abnormality Based on the Effect of Defect Dipoles in Cr Ion Doped Multipurpose Properties of BCT Ceramics

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Correlation between structure, dielectric and multiferroic properties of lead free Ni modified BaTiO3 solid solution

Cited by 66 publications

References 54 publications

Structural, Electrical, Magnetic and Optical Properties of&nbsp;BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Structural, Electrical, Magnetic and Optical Properties of&nbsp;BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Barium Titanate Semiconductor Band Gap Characterization through Gravitationally Optimized Support Vector Regression and Extreme Learning Machine Computational Methods

WITHDRAWN: Unraveling Dielectric Abnormality Based on the Effect of Defect Dipoles in Cr Ion Doped Multipurpose Properties of BCT&nbsp;Ceramics

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Product

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Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

WITHDRAWN: Unraveling Dielectric Abnormality Based on the Effect of Defect Dipoles in Cr Ion Doped Multipurpose Properties of BCT Ceramics