Effect of CuO addition on magnetic and electrical properties of Sr2Bi4Ti5O18 lead-free ferroelectric ceramics

Elayaperumal, E.; Malathi, M.

doi:10.1016/j.ceramint.2015.12.126

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…The extrapolation of the linear region (Figure 8B) gives the optical bandgap of each material under this study. The bandgap ( E g ) values are 3.22, 3.13, 3.20, and 2.9 eV for SBT‐0, SBT‐5, SBT‐10, and SBT‐20, respectively, and these values are very closely matched with earlier reported pure SBT ceramic 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 .…”

Section: Resultssupporting

confidence: 87%

“…The bandgap (E g ) values are 3.22, 3.13, 3.20, and 2.9 eV for SBT-0, SBT-5, SBT-10, and SBT-20, respectively, and these values are very closely matched with earlier reported pure SBT ceramic. 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: 79%

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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: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 79%

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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“…Hence, in the current article we investigated the effect of CuO modification on the dielectric, ferroelectric and piezoelectric properties of SBTi. The CuO is a well-known sintering aid, which can influence the density as well as electric properties of SBTi [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi₄Ti₄O₁₅ ceramics

Jose

Vineetha

Prasanth

et al. 2019

Mater. Res. Express

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We report a systematic investigation of the structure, micro-structure, dielectric, ferroelectric and piezoelectric properties of CuO added SrBi 4 Ti 4 O 15 ceramics. All the samples were prepared by solid state reaction technique, where the wt% of CuO in SrBi 4 Ti 4 O 15 was varied as x=0, 0.05, 0.2, 0.5. The addition of CuO increased the density of SrBi 4 Ti 4 O 15 ceramics which in turn resulted in the improvement of dielectric, ferroelectric as well as piezoelectric properties. However, no change either in the crystal structure or lattice parameter was observed with CuO addition. Further a dense microstructure with improved electrical properties is expected to be due to liquid phase sintering. Raman spectra and specific heat measurements were also performed for getting further insight into the properties.

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“…For x = 0.5 mol% sample, squareness ratio of the loop is almost equal to 2 which express better uniformity and homogeneity in grain size and therefore the remnant polarization was enhanced by means of domain reorientation. Moreover, very low internal bias field of -0.09 kV/cm was created in x = 0.5 mol% sample, which is also comparable to undoped SBT 5 ceramics and it shows that the domain stability is relatively better after adding CuO into SBT 6 ceramics [29].…”

Section: Ferroelectric Studiesmentioning

confidence: 63%

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric ceramics

Elayaperumal

Malathi

Murugesan

et al. 2020

J Mater Sci: Mater Electron

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Room temperature multiferroicity was achieved in CuO-doped Sr 3 Bi 4 Ti 6 O 21 (SBT 6 ) lead-free bismuth layered structure ferroelectric ceramics. On addition of CuO, a feeble magnetization with highest saturation magnetization of * 3 memu/g and least coercivity of 676 Oe was obtained for x = 0.5 mol% sample. The effect of magnetic field on the ferroelectric properties was investigated, which reveals the presence of magnetoelectric (ME) coupling indirectly and the maximum remnant polarization of 12.16 lC/cm 2 at 1 kOe was obtained. Moreover, from direct measurements (ME studies), coupling between ferromagnetic and ferroelectric phases was also achieved at room temperature. Further, the presence of feeble ME effect decreases upon increasing CuO doping concentration, especially at higher doping concentration. The induced spontaneous magnetization, oxygen vacancies and strong magnetic superexchange interaction of CuO played a key role in achieving room temperature multiferroicity.

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Effect of CuO addition on magnetic and electrical properties of Sr2Bi4Ti5O18 lead-free ferroelectric ceramics

Cited by 11 publications

References 42 publications

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Effect of ZnSnO₃ on dielectric and ferroelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics

Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi₄Ti₄O₁₅ ceramics

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric ceramics

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Effect of CuO addition on magnetic and electrical properties of Sr2Bi4Ti5O18 lead-free ferroelectric ceramics

Cited by 11 publications

References 42 publications

Effect of ZnSnO3 on dielectric and ferroelectric properties of Sr2Bi4Ti5O18 ceramics

Effect of ZnSnO3 on dielectric and ferroelectric properties of Sr2Bi4Ti5O18 ceramics

Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi4Ti4O15 ceramics

Observation of room temperature multiferroicity in CuO-doped Sr3Bi4Ti6O21 lead-free ferroelectric 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

Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi₄Ti₄O₁₅ ceramics