FeGa2O4 nanowires preparation after milling and annealing of Fe doped GaN samples

Mendoza-Cachú, D.; Herrero-Calvillo, R.; López-Miranda, J. Luis; Esparza, Rodrigo; Rosas, G.

doi:10.1016/j.jcrysgro.2019.125220

Cited by 2 publications

(2 citation statements)

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“…It shows polymorphism exhibiting α, β, γ, δ, and ε forms and a recently reported κ form. , Moreover, owing to its electronic properties, optical properties, as well as significant chemical and thermal stability, it finds applications in catalysts, phosphors, electroluminescent devices, and gas sensors. , As one of the previously introduced polymorphs, spinel-type γ-Ga 2 O 3 exhibits intrinsic Ga vacancies in both tetrahedral and octahedral sites, as reported by Playford et al Therefore, γ-Ga 2 O 3 can be an efficient host accommodating and replacing a transition metal or rare-earth metal element, which can further broaden its application scope. In recent years, spinel-type Ga-based metal oxides such as FeGa 2 O 4 , CuGa 2 O 4 , CdGa 2 O 4 , and ZnGa 2 O 4 have been studied for use as magnetic materials, gas sensors, photocatalysts, and transparent conductors. − As a spinel-type Ga-based metal oxide, CoGa 2 O 4 has been considered for applications in ceramic pigments, p-type semiconductors, gas sensors, electrocatalysts, , and cathodes and anodes for various types of capacitors − owing to its superior conductivity, electrochemical activity, and energy storage capability. It has a partially inverse structure, as shown in Figure , where divalent and trivalent cations, that is, Co 2+ and Ga 3+ , occupy both tetrahedral and octahedral sites.…”

Section: Introductionmentioning

confidence: 99%

Supercritical Hydrothermal Synthesis of Spinel-Type Nonstoichiometric Cobalt Gallate Nanoparticles and Their Magnetic Properties

Xie

Numako

Naka

et al. 2023

Crystal Growth & Design

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Spinel-type metal oxide nanoparticles are known to exhibit various properties, which can be further enhanced by the synthesis of nonstoichiometric nanoparticles. In this work, we report the production of nonstoichiometric cobalt gallate nanoparticles (Co−Ga NPs) with larger inversion parameters that resulted in enhanced magnetic properties compared to previous studies. The synthesis of nonstoichiometric nanoparticles was realized by a supercritical hydrothermal process and without performing calcination at a high temperature which tended to synthesize thermodynamically stable stoichiometric products. We synthesized nonstoichiometric Co−Ga NPs with a controllable Co/Ga molar ratio, morphology, and particle size at different pH values of the precursor solutions. By applying X-ray absorption fine structure analysis at Ga K-edge, Co K-edge, and Rietveld refinement, nonstoichiometric Co−Ga NPs were found to have large numbers of cobalt atoms occupying octahedral sites compared to CoGa 2 O 4 . Their superparamagnetic behavior with enhanced spontaneous magnetization at room temperature owing to percolated superexchange interaction of J BB was observed for the first time. We also proposed a possible formation mechanism of nonstoichiometric Co−Ga NPs from cobalt gallium nitrate layered double hydroxides in the precursor solutions.

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Section: Introductionmentioning

confidence: 99%

Supercritical Hydrothermal Synthesis of Spinel-Type Nonstoichiometric Cobalt Gallate Nanoparticles and Their Magnetic Properties

Xie

Numako

Naka

et al. 2023

Crystal Growth & Design

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“…However, the synthesis conditions of FGO in the reported literature are rather harsh. For example, D. Mendoza-Cachúet al 25 synthesized FGO nanowires by ball milling and then calcining at high temperature, and I. S. Lyubutin et al 26 synthesized FGO nanoparticles by the combustion method. Therefore, it is necessary to explore a simple and easy-to-implement method to synthesize FGO bimetallic oxides.…”

Section: Introductionmentioning

confidence: 99%

Iron Gallium Oxide with High-Capacity and Super-Rate Performance as New Anode Materials for Li-Ion Capacitors

Gao

Kong

2021

Energy Fuels

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Thanks to the combination of the advantages of batteries and supercapacitors, battery-supercapacitor hybrid devices (BSHD) with higher power densities than batteries and higher energy densities than supercapacitors have aroused extensive concerns. Through the reasonable design of the capacity and kinetic characteristics of the cathode and anode, BSHD can provide individual advantages such as excellent properties, low cost, and safety. Li-ion BSHD has been widely studied because of lithium's low potential and small ionic radius. However, the anode with slow electrode process dynamics is a great challenge for developing high-performance Li-ion BSHD. Consequently, it is essential to develop an electrode material with better electrical conductivity and a faster electrochemical reaction process. Here, an inverse spinel oxide iron gallium oxide (FeGa 2 O 4 , FGO) is designed with Fe 2+ occupying octahedral sites and Ga 3+ occupying tetrahedral sites. FGO pure phase was successfully synthesized by controlling the calcination temperature and atmosphere, and the experimental results were verified by X-ray diffraction (XRD). Subsequently, the electrochemical test of the half-cell shows that the capacity is stable at 500 mAh g −1 after 200 cycles at a current density of 0.1 A g −1 , showing that the electrode has extraordinary cycle stability. Meanwhile, the kinetics of the electrode process of the material was tested by pseudocapacitance calculations, electrochemical impedance spectra (EIS), and the galvanostatic intermittent titration technique (GITT). The results show that the material is suitable for Li-ion BSHD. The assembled Li-ion BSHD exhibits high energy density (up to 107.19 Wh kg −1 ), high power density (up to 4126.01 W kg −1 ), and long cycle life in a wide working voltage range (0.5−4.0 V). Therefore, this work has carried out a new research direction for Li-ion BSHD's electrode materials with high performance.

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FeGa2O4 nanowires preparation after milling and annealing of Fe doped GaN samples

Cited by 2 publications

References 50 publications

Supercritical Hydrothermal Synthesis of Spinel-Type Nonstoichiometric Cobalt Gallate Nanoparticles and Their Magnetic Properties

Supercritical Hydrothermal Synthesis of Spinel-Type Nonstoichiometric Cobalt Gallate Nanoparticles and Their Magnetic Properties

Iron Gallium Oxide with High-Capacity and Super-Rate Performance as New Anode Materials for Li-Ion Capacitors

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