Investigation of photocatalytic and dielectric behavior of LaFeO3 nanoparticles prepared by microwave-assisted sol–gel combustion route

Controlling oxygen content in perovskite oxides with ABO3 structure is one of most critical steps for tuning their functionality. Notably, there have been tremendous efforts to understand the effect of changes in oxygen content on the properties of perovskite thin films that are not composed of cations with multiple valance states. Here, we study the effect of oxygen vacancies on structural and electrical properties in epitaxial thin films of SrFeO3−δ (SFO), where SFO is a compound with multiple valance states at the B site. Various annealing treatments are used to produce different oxygen contents in the films, which has resulted in significant structural changes in the fully strained SFO films. The out-of-plane lattice parameter and tetragonality increase with decreasing oxygen concentration, indicating the crystal structure is closely related to the oxygen content. Importantly, variation of the oxygen content in the films significantly affects the dielectric properties, leakage conduction mechanisms, and the resistive hysteresis of the materials. These results establish the relationship between oxygen content and structural and functional properties for a range of multivalent transition metal oxides.

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“…Similar dielectric response behavior has also been seen in LaFeO 3 in studies reported by Gaikwad et al . 43 .…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy-Tuned Physical Properties in Perovskite Thin Films with Multiple B-site Valance States

Enriquez

Chen

Harrell

et al. 2017

Sci Rep

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“…As shown in Fig. 3(e), LaFeO3 obtained via a combined microwave-assisted sol-gel method showed enhanced photoactivity for methylene blue decolorization [204]. The microwave assisted technique come into view as a new synthesis method and greatly explored in the terms of organic/inorganic synthesis owing to the diverse benefits like quick reaction time, homogeneous microwaving, along with the green and proficient energy purpose [205].…”

Section: Microwave-assisted Methodsmentioning

confidence: 99%

Perovskite-type lanthanum ferrite based photocatalysts: Preparation, properties, and applications

Humayun

Ullah

Usman

et al. 2022

Journal of Energy Chemistry

107

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“…Third, there is neither polar-catastrophe-dominated nor redox-reaction-mediated charge transfers across the LFO/STO interface when the LFO layer is thin. Based on the polar catastrophe model, the critical thickness of LFO ( l LFO ) for triggering the interlayer charge transfer between polar LFO and nonpolar STO is about 20 nm (50 uc), which can be estimated by l LFO = ε 0 ε LFO Δ E g / eP LFO 0 , where ε 0 is the vacuum permittivity, ε LFO = 120 , is the relative permittivity of LFO, e is the elementary charge, P LFO 0 is the formal polarization of LFO, and Δ E g (∼3.2 eV) is the energy difference between the valence band of LFO and the conduction band of STO. In the view of oxygen affinity, LFO cannot take the oxygen from STO to induce the interfacial redox reaction, resulting in preservation of the insulating nature at the STO interface .…”

Section: Resultsmentioning

confidence: 99%

Characteristic Lengths of Interlayer Charge Transfer in Correlated Oxide Heterostructures

Omar

Chi

et al. 2020

Nano Lett.

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Using interlayer interaction to control functional heterostructures with atomic-scale designs has become one of the most effective interfaceengineering strategies nowadays. Here, we demonstrate the effect of a crystalline LaFeO 3 buffer layer on amorphous and crystalline LaAlO 3 /SrTiO 3 heterostructures. The LaFeO 3 buffer layer acts as an energetically favored electron acceptor in both LaAlO 3 /SrTiO 3 systems, resulting in modulation of interfacial carrier density and hence metal-to-insulator transition. For amorphous and crystalline LaAlO 3 /SrTiO 3 heterostructures, the metal-to-insulator transition is found when the LaFeO 3 layer thickness crosses 3 and 6 unit cells, respectively. Such different critical LaFeO 3 thicknesses are explained in terms of distinct characteristic lengths of the redox-reaction-mediated and polar-catastrophedominated charge transfer, controlled by the interfacial atomic contact and Thomas−Fermi screening effect, respectively. Our results not only shed light on the complex interlayer charge transfer across oxide heterostructures but also provide a new route to precisely tailor the charge-transfer process at a functional interface.

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Investigation of photocatalytic and dielectric behavior of LaFeO3 nanoparticles prepared by microwave-assisted sol–gel combustion route

Cited by 24 publications

References 57 publications

Oxygen Vacancy-Tuned Physical Properties in Perovskite Thin Films with Multiple B-site Valance States

Oxygen Vacancy-Tuned Physical Properties in Perovskite Thin Films with Multiple B-site Valance States

Perovskite-type lanthanum ferrite based photocatalysts: Preparation, properties, and applications

Characteristic Lengths of Interlayer Charge Transfer in Correlated Oxide Heterostructures

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