Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO2 nanoparticles

Yamazaki, Takahiro; Morimoto, Shinya; Hyodo, Kuminori; Ishikawa, Tomoya; Ichiyanagi, Yuko

doi:10.1016/j.jallcom.2018.02.261

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…The structure of ABO 2 -type delaffosite oxides comprises of edge share distorted BO 6 octahedra arranged in alternate layers whereas A cation is oriented in 2D closed pack array of O–A–O in dumbbell shape and oxygen is tetrahedrally coordinates with one monovalent A + cation and three trivalent B 3+ cations. Delaffosite NPs have been synthesized by hydrothermal means, − flash autocombustion, chemical deposition, a glycine–nitrate process, an oxygen plasma enhanced reactive evaporation technique, sol–gel, and coprecipitation methods . The MSS has been used as an easy and green method for obtaining delaffosite nanomaterials.…”

Section: Metal Oxide Nanomaterials Synthesized By the Mssmentioning

confidence: 99%

“…Delaffosite NPs have been synthesized by hydrothermal means, 193−196 flash autocombustion, 197 chemical deposition, 198 a glycine−nitrate process, 199 an oxygen plasma enhanced reactive evaporation technique, 200 sol−gel, 201 and coprecipitation methods. 202 The MSS has been used as an easy and green method for obtaining delaffosite nanomaterials. Santra et al demonstrated the MSS for CuBO 2 nanorods using KCl molten salt at 800 °C (Figures S4 and 9).…”

Section: Metal Oxide Nanomaterials Synthesizedmentioning

confidence: 99%

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Recent Developments on Molten Salt Synthesis of Inorganic Nanomaterials: A Review

2021

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A wide range of inorganic nanomaterials with many fascinating properties and application potentials in widespread fields may be synthesized by wet chemical synthetic routes. To achieve scientific and commercial viability of nanomaterials with uniformity and scalability, it is necessary to develop efficient and cost-effective, preferably sustainable, methods. The molten salt synthesis (MSS) method is one such bottom-up technique to fabricate a wide variety of inorganic nanomaterials with tunable size, morphology, and surface characteristics. It is also environmentally friendly, cost-effective, simple to operate, easy to scale, and generalizable, etc. This review gives a critical overview on this emerging and rapidly developing method for making defect free nanomaterials in well-defined texture, surface, and morphology at a relatively low formation temperature. We have discussed its different aspects, including the role of molten salts, the choice of molten salts, the electrochemical aspects, some advanced modifications of the conventional MSS technique, and their implications. To show the most recent development on MSS synthesized inorganic nanomaterials, this review only encompasses the studies reported over the last six years (2015−2020). We have summarized technologically important and emerging families of inorganic nanomaterials such as metal oxides, fluorides, nitrides, silicides, chalcogenides, oxohalides, borides, and carbides. Finally, a few perspectives for the MSS method are highlighted. It is expected that this review will further attract scientists to explore the MSS method in making size-and shape-tunable nanomaterials.

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Section: Metal Oxide Nanomaterials Synthesized By the Mssmentioning

confidence: 99%

Section: Metal Oxide Nanomaterials Synthesizedmentioning

confidence: 99%

Recent Developments on Molten Salt Synthesis of Inorganic Nanomaterials: A Review

2021

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“…A x B 1– x O 2 oxide is a delafossite mineral, a class of complex metal oxides . Delafossites have extraordinary physical properties that include good optical transmission in the visible region, high magnetoresistance, high-temperature superconductivity, excellent photocatalytic capability, metal–semiconductor transition capability, quick sodium-/lithium-ion transport, , and good chemical stability . These oxides are used in oxygen separation membranes for the specific oxidation of hydrocarbons and energy storage applications .…”

Section: Introductionmentioning

confidence: 99%

First-Principles Calculations to Investigate Coupling Fe Doping with Oxygen Vacancies in Stannic Oxide and Their Physical Properties

Ramaraj,

SKS,

Zhang

et al. 2023

J. Phys. Chem. C

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We study the effects of Fe doping on the structural, electronic conductivity, elastic constants, and thermal conductivity of Sn 1−x Fe x O 2 (0 ≥ x ≤ 1) oxides by orbital hybridization as a consequence of charge remuneration of Fe 2+ /Fe 3+ and charge transfer using density functional theory calculations. We derive an effective spin-pseudospin Hamiltonian (H effective ) on the subspace of states with separately involved t 2g orbitals at each Fe site and visualize the combined atomic orbitals to form various molecular orbitals. Here, we determined that the mixed-valence electrons empowered by Fe 2+ −O 2− −Fe 3+ pairings in higher concentrations prevail through the double exchange-coupled pair. Specifically, we examined the oxygen positional parameters, average bond length, octahedral distortion, electronic structure, bulk modulus, shear modulus, Young's modulus, Poisson ratio, and thermal conductivity, which were significantly affected by the concentrations of x (0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1), leading to negative shear and Young's moduli, a large Gruneisen parameter, and a lower Debye temperature. We estimate an ultralow thermal conductivity for Sn 1−x Fe x O 2 of around 0.002−1.5 W m −1 K −1 at 300 K. We also found that fixations of the 0.5 and 0.3 dopants lead to ultralow thermal conductivity. The electronic structure of SnO 2 is 3.582 eV, and the maximum valence band is composed of the O-2p and Sn-5p states, while the conduction band minimum is between the O-2p and Sn-5s states. Fe doping modulates the bond strengths in Sn 1−x Fe x O 2 by introducing intermediate energy levels and increasing the degree of hybridization of the Fe-d, Sn-p, and O-p electron states. The reduced thermal conductivity at ambient temperature makes the material an effective candidate for use in thermal management materials and optoelectronic devices.

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Optimizing electron structure of Zn-doped AgFeO2 with abundant oxygen vacancies to boost photocatalytic activity for Cr(VI) reduction and organic pollutants decomposition: DFT insights and experimental

Guo

Tang

et al. 2021

Chemical Engineering Journal

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Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO2 nanoparticles

Cited by 8 publications

References 24 publications

Recent Developments on Molten Salt Synthesis of Inorganic Nanomaterials: A Review

Recent Developments on Molten Salt Synthesis of Inorganic Nanomaterials: A Review

First-Principles Calculations to Investigate Coupling Fe Doping with Oxygen Vacancies in Stannic Oxide and Their Physical Properties

Optimizing electron structure of Zn-doped AgFeO2 with abundant oxygen vacancies to boost photocatalytic activity for Cr(VI) reduction and organic pollutants decomposition: DFT insights and experimental

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