2018
DOI: 10.1063/1.5055742
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Oxygen vacancy induced photoconductivity enhancement in Bi1-xCaxFeO3-δ nanoparticle ceramics: A combined experimental and theoretical study

Abstract: Based on experimental and density functional studies, we show that tailoring of oxygen vacancies (OV) leads to large scale enhancement of photoconductivity in BiFeO3 (BFO). The OV concentration is increased by substituting an aliovalent cation Ca2+ at Bi3+ sites in the BFO structure. Furthermore, the OV concentration at the disordered grain boundaries can be increased by reducing the particle size. Photoconductivity studies carried out on spark plasma sintered Bi1-xCaxFeO3-δ ceramics show four orders of enhanc… Show more

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Cited by 14 publications
(7 citation statements)
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“…Higher concentration of Ca and Ti cosubstitution makes it a bit worse due to the significant scattering arising from the conducting grain boundary regions. The structural observations made in these spin-coated films are consistent with the observation made on the nanoparticle ceramics of Bi 1– x Ca x FeO 3−δ obtained by the spark plasma sintering process …”
Section: Resultssupporting
confidence: 89%
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“…Higher concentration of Ca and Ti cosubstitution makes it a bit worse due to the significant scattering arising from the conducting grain boundary regions. The structural observations made in these spin-coated films are consistent with the observation made on the nanoparticle ceramics of Bi 1– x Ca x FeO 3−δ obtained by the spark plasma sintering process …”
Section: Resultssupporting
confidence: 89%
“…Enhancement in the photocurrent observed in Mn-doped BFO, where polarization can’t be switched, is shown to be due to the presence of V O at the BFO–metal interface . V O concentration controlled by aliovalent substitution of Ca 2+ at Bi 3+ site is shown to influence the photoconductivity in nanoparticle BiFeO 3 ceramics . Therefore, it is very crucial to understand the effect of oxygen vacancies on the ferroelectric property of a material and its solar cell device performance.…”
Section: Introductionmentioning
confidence: 99%
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“…Bismuth ferrite (BiFeO 3 ) has been studied intensively over the last decades. It possessing high T C (above 1000 K) and Néel Temperature ( ∼ 643 K) is both ferroelectric and antiferromagnetic at RT. ,, It is one of the few compounds that exhibit the multiferroic at RT. It is also the typical sample that researchers choose to investigate the physics behind multiferroic couplings and corresponding devices.…”
Section: Ferroelectricsmentioning
confidence: 99%
“…Surface oxygen vacancy captured CO 2 strongly and then released CO after dissociation of CO 2 above 1500 K. There were two key processes of formation of oxygen vacancies and dissociative chemisorption of CO 2 in a typical themochemical redox cycle. The nanocatalysts in this work would have high surface areas and defective surfaces, providing a large amount of oxygen vacancies and chemisorption sites even at 700 K, 91 which was a much lower temperature of thermal reduction of a redox metal oxide. The high reactivity of particle sizes smaller than 20 nm is thus a result of the surface properties.…”
Section: Acs Sustainable Chemistry and Engineeringmentioning
confidence: 99%