Tunable bandgap of bismuth-modified barium titanate by cobalt substitution for photovoltaic application

Ramay, Shahid M.; Kassim, Hamoud; Mahmood, Asif; Siddig, Abubaker A.; Zayed, Nasser Saleh Al

doi:10.1007/s10854-022-08359-7

Cited by 1 publication

(1 citation statement)

References 66 publications

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“…Also, it is well known that magnetization decreases with the decreasing density of ceramics since reduced density increases the number of pores, which serve as electron spin-pinning centers and lower magnetization. [54,55] The weakening permeability may also reduce the saturation magnetization of the composition at 5% and 10% concentrations, as shown in Figure 7. [56] Figure 6 clearly indicates that the sample with x = 0.15 has a saturation magnetization of 0.092 emu g À1 , which is the highest of all the compositions.…”

Section: Field-dependent Hysteresis Loop Studymentioning

confidence: 99%

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

Mahmud

Ahamed

Khan

2023

Physica Status Solidi (a)

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Considering the multifunctional performance, the (Ba0.7Sr0.3)0.98Ca0.02Ti1−xCoxO3 (x = 0.00–0.2) ceramics are successfully synthesized using the traditional solid‐phase reaction method. The effect of cobalt doping on the samples’ structural, morphological, magnetic, electrical, and optical characteristics is elucidated. Raman spectroscopy and X‐ray diffraction data confirm the dopants’ integration into the cubic perovskite microstructure. At room temperature, the magnetization–magnetic field intensity hysteresis loops from vibrating sample magnetometer reveal the samples’ ferromagnetic character, with a maximum magnetization of 0.091 emu g−1 achieved for x = 15%. The real part of the initial permeability demonstrates that the replacement of Co2+ causes a shift in resonance toward higher frequencies above 85 MHz, indicating the potential of the synthesized ceramics for high‐frequency magnetic applications. The variation in dielectric characteristics from 100 Hz to 10 MHz is explained using electron hopping on octahedral sites and Maxwell–Wagner's model. The increase of AC conductivity in the high‐frequency region is consistent with the strengthening of the grain effect on the conduction mechanism, which supports the small‐range polaron‐hopping theory. The complex electric modulus's peak (M′′) shifts toward a higher‐frequency region with cobalt content, suggesting a reduction in the relaxation rate. The optical bandgap is observed to decrease from 3.08 to 2.96 eV with cobalt content.

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Section: Field-dependent Hysteresis Loop Studymentioning

confidence: 99%

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

Mahmud

Ahamed

Khan

2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

Tunable bandgap of bismuth-modified barium titanate by cobalt substitution for photovoltaic application

Cited by 1 publication

References 66 publications

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

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Tunable bandgap of bismuth-modified barium titanate by cobalt substitution for photovoltaic application

Cited by 1 publication

References 66 publications

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba0.7Sr0.3)0.98Ca0.02Ti1−XCoxO3 Ceramics for Device Applications

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba0.7Sr0.3)0.98Ca0.02Ti1−XCoxO3 Ceramics for Device Applications

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Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications