Flash assisted synthesis and densification of five component high entropy oxide (Mg, Co, Cu, Ni, Zn)O at 350 °C in 3 min

Anurag, Kumar; Sharma, Gaurav; Aftab, Asim; Ahmad, Md. Imteyaz

doi:10.1016/j.jeurceramsoc.2020.02.036

Cited by 57 publications

(40 citation statements)

References 30 publications

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“…One possible reason for such accelerated current increase is the A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Section: Resultsmentioning

confidence: 99%

“…(1) A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

Section: Methodsmentioning

confidence: 99%

“…7,8 Reactive flash sintering has drawn increasing attention in recent years. A number of different materials synthesized by reactive flash sintering have been reported, such as α-Al 2 TiO 5 from TiO 2 and α-Al 2 O 3 , 9 18 high-entropy ultrahigh temperature ceramics, 19 high-entropy oxides, [20][21][22] and high-entropy perovskites. 23,24 Barium titanate (BaTiO 3 ), one of the most well-known ferroelectrics, is widely used in capacitors, thermistors, and transducers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electric field‐assisted solid‐state reaction of BaCO₃‐TiO₂ system

Zhu

Wang

et al. 2021

J Am Ceram Soc.

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We report phase transition process during the solid-state reaction of BaCO 3 -TiO 2 system under the assistance of electric field. Experiments were conducted at a constant heating rate with preset field strength and current limit. Solid-state reaction was completed upon reactive flash sintering taking place at ~1002℃ under 200 V/cm. Hexagonal BaTiO 3 phase, which rarely occurs at such temperatures, was obtained after flash sintering at a current density of 23.5 mA/mm 2 . It is speculated that oxygen deficiency during flash sintering triggered cubic-to-hexagonal transition of BaTiO 3 . Furthermore, X-ray diffraction results show that solid-state reaction takes place prior to flash sintering. Electric field could accelerate the reaction but did not alter the sequence of phase evolution.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electric field‐assisted solid‐state reaction of BaCO₃‐TiO₂ system

Zhu

Wang

et al. 2021

J Am Ceram Soc.

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“…[146] Recently, a flash assisted method was also developed to realize quick synthesis of rocksalt solid solution phase at low temperature of 350 °C in 3 min. [147] In order to prepare nano-scale HEOs, Wang et al conceived a low-temperature solvothermal synthesis followed by pyrolysis at 400 °C to obtain spinel-type HEO with average particle size of ≈5 nm. [148] The spinel HEO nanocrystalline was also fabricated by solution combustion synthesis.…”

Section: High-entropy Constructionmentioning

confidence: 99%

Multidimensional Nonstoichiometric Electrode Materials for Electrochemical Energy Conversion and Storage

Liu

Jinhan

et al. 2021

Advanced Energy Materials

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number of compounds deviate from definite composite. For example, Wüstite type FeO was found to occur in varied Fe/O ratios with Fe vacancies over a narrow limit in nature, [2,3] while stoichiometric form of FeO was obtained only under high pressure. [4] With the discovery of more chemical compounds with compositions deviating from their stoichiometric counterparts, a new family of materials, which is now recognized as nonstoichiometric material (NMs) or berthollides in honor of Berthollet, has drawn increasing research interest in materials chemistry.Structurally, nonstoichiometry can be induced from defect engineering, element doping, or substitution. [5,6] Although the resulting composition and elemental ratio are allowed to vary in a wide range, the phase and space group of nonstoichiometric compounds are generally identical to the parent stoichiometric counterparts. The type of nonstoichiometry is multidimensional, ranging from point defects (vacancy, substitution or interstitial), local defect (Frenkel pair or cation mixing), linear substitution (typically in layered compounds) to surface defect, bulk composition variation, and spatially dependent concentration gradient. [7] Thermodynamically, deviation from stoichiometry is always accompanied by the change in the system Gibbs free energy and/or redox of characteristic ions, which would endow the materials with multiple physicochemical features in modulating electronic structures, chemical valence, charge storage, carrier diffusion, and stability. [8][9][10][11] Since nonstoichiometry widely exists in many types of compounds including oxides, nitrides, carbides, sulfides, and alloys, it is desirable to develop deep understanding over the fundamental origin, related features, and their contributions to practical functionality.In the context of developing renewable energy conversion and storage, functional electrode materials are crucial to determine the electrochemical performance, stability, and cost. [11,12] In electrocatalysis, exploring highly active electrode materials for hydrogen evolution reaction (HER), oxygen reduction reaction (ORR), and oxygen evolution reaction (OER) is a key to boost the performance of water splitting, fuel cell, and metalair battery. [13][14][15] Meanwhile, electrochemical nitrogen reduction reaction (NRR) under ambient conditions provides a promising pathway of ammonia synthesis from N 2 and H 2 O alternative to the traditional contaminative Haber-Bosch process. [16] For batteries, the cell voltage, reversible capacity, and cycling Nonstoichiometry plays an important role in determining physicochemical properties such as conductivity, activity, and stability due to the compositioninduced change in phase, local atomic environment, and electronic structure. A variety of materials with nonstoichiometry have emerged in electrochemical energy conversion and storage, which necessitates a solid understanding of their formation mechanism and structure-function relationship. This review presents a summary of the progress made in this ...

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“…In addition to reducing energy consumption, FS enables other enhancements to glass and ceramic manufacturing. 11 The flash event can be used to facilitate the synthesis of complex oxides, 12 formation of ceramic-ceramic 13 and metal-ceramic 14,15 joints, and viscous 16 and plastic 17 deformations. The flash event has also allowed the consolidation of microstructures 18 and phases 19 that cannot be achieved via conventional heating.…”

Section: Introductionmentioning

confidence: 99%

Promoting microstructural homogeneity during flash sintering of ceramics through thermal management

Jones

Biesuz

et al. 2021

MRS Bulletin

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Flash sintering (FS) is a novel field-assisted sintering technology, where the ceramic is heated internally by the Joule effect. While FS promises a tremendous reduction of ceramic firing time and furnace temperature, it has been applied only at the laboratory scale to date. The key limitation of scaling up the technique to the industrial manufacturing level is the intrinsic difficulty managing the heat generation and obtaining homogenous microstructures in components of industrial interest. Heterogeneous regions primarily originate from the different types of thermal gradients that develop during FS; therefore, the management of heat generation is crucial to achieve uniformity. In this article, we discuss the advantages of controlling the microstructural homogeneity of ceramics during FS, and the technical routes to achieve this. The origin and formation mechanisms of thermal gradients upon flash sintering are outlined. Possible approaches to reduce thermal and microstructural gradients are identified. The opportunities and challenges in scale-up of FS are discussed from both industrial and scientific perspectives.

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Flash assisted synthesis and densification of five component high entropy oxide (Mg, Co, Cu, Ni, Zn)O at 350 °C in 3 min

Cited by 57 publications

References 30 publications

Electric field‐assisted solid‐state reaction of BaCO₃‐TiO₂ system

Electric field‐assisted solid‐state reaction of BaCO₃‐TiO₂ system

Multidimensional Nonstoichiometric Electrode Materials for Electrochemical Energy Conversion and Storage

Promoting microstructural homogeneity during flash sintering of ceramics through thermal management

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Flash assisted synthesis and densification of five component high entropy oxide (Mg, Co, Cu, Ni, Zn)O at 350 °C in 3 min

Cited by 57 publications

References 30 publications

Electric field‐assisted solid‐state reaction of BaCO3‐TiO2 system

Electric field‐assisted solid‐state reaction of BaCO3‐TiO2 system

Multidimensional Nonstoichiometric Electrode Materials for Electrochemical Energy Conversion and Storage

Promoting microstructural homogeneity during flash sintering of ceramics through thermal management

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Product

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Electric field‐assisted solid‐state reaction of BaCO₃‐TiO₂ system

Electric field‐assisted solid‐state reaction of BaCO₃‐TiO₂ system