Effect of oxygen vacancies and cationic valence state on multiferroicity and magnetodielectric coupling in (1-x)BaTiO3.(x)LaFeO3 solid solution

Maneesha, P.; Samantaray, Koyal Suman; Baral, Suresh Chandra; Brzykcy, Grace; Bhaumik, Indranil; Mekki, Abdelkrim; Pathak, Arjun K.; Sen, Somaditya

doi:10.1016/j.jallcom.2023.172587

Cited by 6 publications

(4 citation statements)

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“…(1 − x)BaTiO 3 -(x)LaFeO 3 (x = 0, 0.015, 0.031, 0.062) are prepared through the sol-gel method as described in a previous report. 21 The samples are named as BTO for x = 0, BLFT1 for x = 0.015, BLFT2 for x = 0.031, and BLFT3 for x = 0.062. The bandgap of all the samples was determined from the diffuse reflectance spectra (DRS) using a UV-vis-NIR Shimadzu 2600 spectrophotometer.…”

Section: Methodsmentioning

confidence: 99%

“…In the BLFT samples, both Ti 3+ and Fe 2+ ions were observed suggesting an increase of J-T distortion. Displacements in Ti-O/Fe-O and Ba-O/La-O bonds for the BLFT samples 21 ensure J-T effect. The Jahn-Teller distortions modify the energy and the splitting.…”

Section: Electronic Bandgap Studiesmentioning

confidence: 96%

“…The presence of both Ti 3+ , Ti 4+ and Fe 2+ , Fe 3+ ions in the BLFT samples was observed from XPS studies. 21 . As a result, O V was also found to increase, which changes the density of states.…”

Section: Density Of States Analysismentioning

confidence: 99%

“…19,20 (1 − x)BaTiO 3 -(x)LaFeO 3 (x = 0, 0.015, 0.031, 0.062) solid solution (BLFT) has been studied earlier for the structure-correlated multiferroic and magnetodielectric applications. 21 Fe 3+ is introduced at the Ti 4+ site to induce magnetic properties in the ferroelectric BaTiO 3 lattice. La 3+ is substituted in Ba 2+ sites to tune the electrical properties of BaTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Defect/disorder correlated modification of transport properties from hopping to tunneling processes in BaTiO3–LaFeO3 solid solution

Maneesha,

Samantaray,

Baral

et al. 2024

Journal of Applied Physics

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Crystal structure, bandgap, and the changes in the charge conduction mechanisms in ceramics are interrelated, and the underlying physics unifies all these different phenomena. The experimental and theoretical evaluation of the electronic properties of the solid solution of (1 − x)BaTiO3–(x)LaFeO3 (x = 0, 0.015, 0.031, 0.062) is attempted in this work. Bandgap was observed to be tunable with La/Fe doping from 3.2 eV (x = 0) to 2.6 eV (x = 0.06), while the lattice disorder was found to increase. A theoretical assessment confirms a considerable shift of valence band maxima and conduction band minima with an introduction of additional defect states within the bandgap. Electron localization was also confirmed theoretically with doping. Such changes in the electronic properties were experimentally confirmed from dielectric/AC - conductivity/impedance spectroscopy studies. From different transportation models, hopping is a preferred mechanism in the less distorted BaTiO3. However, a large polaron tunneling process can be justified for the doped samples at lower temperatures. Only at higher temperatures, a small polaron tunneling can be justified for the doped samples. The transportation is affected by the grain boundaries as much as the grains themselves. A complete analysis using Nyquist plots reveals the competing contributions of these regions to the transportation mechanism and is correlated to the disorder/distortions in the lattice in terms of the formation of oxygen vacancies.

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Section: Methodsmentioning

confidence: 99%

Section: Electronic Bandgap Studiesmentioning

confidence: 96%

Section: Density Of States Analysismentioning

confidence: 99%