Effect of cobalt substitution on the optical properties of bismuth ferrite thin films

Sharmila, M.; Kader, S.M. Abdul; Ruth, D. E. Jain; Babu, M. Veera Gajendra; Bagyalakshmi, B.; Kumar, Raju; Padiyan, D. Pathinettam; Sundarakannan, B.

doi:10.1016/j.mssp.2015.01.047

Cited by 25 publications

(2 citation statements)

References 27 publications

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“…44,52 Though we are not able to establish a definite relationship between optical bandgap and composition, we could see that incorporation of ZS leads to a reduction of bandgap due to additional defect energy levels via concentration of oxygen vacancies and structural distortions which could be the main reason for the variation of the optical bandgap of the material. 53,54 In essence from the structure-property correlations discussed here, embedding ZS into the matrix of SBT ceramics resulted in a novel composite electro-ceramic relevant for practical ferroelectric device applications.…”

Section: Resultsmentioning

confidence: 99%

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Bhimireddi,

Dhavala,

Shet

et al. 2023

J Am Ceram Soc.

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Sr2Bi4Ti5O18 is one of the promising candidates for ferroelectric nonvolatile random access memory device applications. Albeit, this ceramic material is not suitable for certain ferroelectric device applications because of the merits and demerits associated with this material. Solid‐solution or composite ceramics in bulk configuration is the better choice to overcome the drawbacks associated with the individual compounds. Concurrently, solid‐solution of functional electro‐ceramics comprising Aurivillius family‐based lead‐free bismuth‐layered structured ceramics (1 − x) Sr2Bi4Ti5O18 (SBT) and x mol% of ilmenite structured ZnSnO3 (ZS) (where x = 0, 5, 10, and 20 mol%) were synthesized via conventional solid‐state reaction route to investigate the effect of ZS on the physical properties of SBT. X‐ray diffraction diffractograms revealed that a single phase was formed maximum up to 5 mol% of ZS in SBT and scanning electron microscopy studies suggested platelike microstructure of the samples. Intriguingly, positive‐up and negative‐down results indicated that the true switchable polarization for the 10 mol% ZS in SBT (10.87 μC/cm2), 33% higher than that of pure SBT ceramics in addition to the lower leakage current density and enhanced dielectric response in the SBT–ZS samples. The observed enhancement in electrical characteristics of SBT–ZS composite ceramics compared to pure SBT highlights the decisive role played by the ZS in lowering the thermodynamic barrier resulting in ease of polarization switching and mitigating the leakage current of SBT ceramics.

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Section: Resultsmentioning

confidence: 99%

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Bhimireddi,

Dhavala,

Shet

et al. 2023

J Am Ceram Soc.

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“…These results reveal that the reaction rate was fastest with photoanodes electrodeposited at a shorter time and the coefficient of regression of all photoanodes was well-fitted into the first-order kinetic model. Thin films are known to possess more active sites which leads to improvement in charge carrier separation thereby reducing the tendency of recombination of photogenerated electrons and holes [ 52 ]. The contributions of adsorption, light, voltage and catalyst to the PEC degradation process were determined with some control experiments such as adsorption (dark), photolysis, photocatalysis and electrocatalysis using the optimal electrode, i.e., at 300 s ( Figure 5 c).…”

Section: Resultsmentioning

confidence: 99%

Photoelectrocatalytic Degradation of Methylene Blue on Electrodeposited Bismuth Ferrite Perovskite Films

et al. 2023

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Electrodeposited bismuth ferrite (BiFeO3) thin films on fluorine-doped tin oxide (FTO) substrate were employed as photoanodes in the photoelectrocatalytic degradation of methylene blue. The BiFeO3 thin films electrodeposited for 300 s, 600 s, 1200 s, 1800 s and 3600 s were characterised with XRD, field emission scanning electron microscopy (FESEM) and UV–vis diffuse reflectance spectroscopy. SEM images displayed different morphology at different electrodeposition times which affects the photoelectrocatalytic (PEC) performances. The FESEM cross-sectional area was used to measure the thickness of the film. The optical properties showed that the band gaps of the photoanodes were increasing as the electrodeposition time increased. The photocurrent response obtained showed that all thin film photoanodes responded to visible light and lower charge transfer resistance (from electrochemical impedance spectroscopy studies) was observed with photoanodes electrodeposited at a shorter time compared to those at a longer time. The PEC application of the photoanode for the removal of methylene blue (MB) dye in water showed that the percentage degradation decreased with an increase in electrodeposition time with removal rates of 97.6% and 70% observed in 300 s and 3600 s electrodeposition time, respectively. The extent of mineralisation was measured by total organic carbon and reusability studies were carried out. Control experiments such as adsorption, photolysis, photocatalysis and electrocatalysis processes were also investigated in comparison with PEC. The electrodeposition approach with citric acid exhibited improved electrode stability while mitigating the problem of catalyst leaching or peeling off during the PEC process.

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Effect of cobalt substitution on the multiferroic characteristics of ferroelectric potassium sodium niobate (K0.5Na0.5NbO3) ceramics

2018

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Effect of cobalt substitution on the optical properties of bismuth ferrite thin films

Cited by 25 publications

References 27 publications

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Photoelectrocatalytic Degradation of Methylene Blue on Electrodeposited Bismuth Ferrite Perovskite Films

Effect of cobalt substitution on the multiferroic characteristics of ferroelectric potassium sodium niobate (K0.5Na0.5NbO3) ceramics

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Effect of cobalt substitution on the optical properties of bismuth ferrite thin films

Cited by 25 publications

References 27 publications

Effect of ZnSnO3 on dielectric and ferroelectric properties of Sr2Bi4Ti5O18 ceramics

Effect of ZnSnO3 on dielectric and ferroelectric properties of Sr2Bi4Ti5O18 ceramics

Photoelectrocatalytic Degradation of Methylene Blue on Electrodeposited Bismuth Ferrite Perovskite Films

Effect of cobalt substitution on the multiferroic characteristics of ferroelectric potassium sodium niobate (K0.5Na0.5NbO3) ceramics

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Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics