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Keywords = reactive flash sintering

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12 pages, 2844 KB  
Article
Structural, Vibrational, and Magnetic Characterization of Orthoferrite LaFeO3 Ceramic Prepared by Reaction Flash Sintering
by Alejandro F. Manchón-Gordón, Pedro E. Sánchez-Jiménez, Javier S. Blázquez, Antonio Perejón and Luis A. Pérez-Maqueda
Materials 2023, 16(3), 1019; https://doi.org/10.3390/ma16031019 - 22 Jan 2023
Cited by 32 | Viewed by 4722
Abstract
LaFeO3 perovskite ceramics have been prepared via reaction flash technique using Fe2O3 and La2O3 as precursors. The obtained pellets have been investigated using several techniques. The formation of LaFeO3 has been clearly confirmed by X-ray [...] Read more.
LaFeO3 perovskite ceramics have been prepared via reaction flash technique using Fe2O3 and La2O3 as precursors. The obtained pellets have been investigated using several techniques. The formation of LaFeO3 has been clearly confirmed by X-ray diffraction. The scanning electron microscopy micrographs have shown the microporous character of the obtained pellets due to the low temperature and dwell time used in the synthesis process (10 min at 1173 K). The orthorhombic-rhombohedral phase transition has been observed at approximately 1273 K in differential thermal analysis measurements, which also allows us to determine the Néel temperature at 742 K. The fitted Mössbauer spectra exposed the presence of a single sextet ascribed to the Fe+3 ions in the tetrahedral site. Finally, magnetic measurements at room temperature indicate the antiferromagnetic character of the sample. Full article
(This article belongs to the Special Issue High-Performance Structural Ceramics and Hybrid Materials)
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9 pages, 2184 KB  
Article
Reactive Flash Sintering of High-Entropy Oxide (Mg, Co, Ni, Cu, Zn)1−xLixO at Room Temperature
by Nianping Yan, Yuchen Zhu, Muliang Cai, Bojiang Li, Bichuan Xu, Yueji Li, Xilin Wang and Zhidong Jia
Materials 2022, 15(11), 3836; https://doi.org/10.3390/ma15113836 - 27 May 2022
Cited by 9 | Viewed by 3499
Abstract
(Mg, Co, Ni, Cu, Zn)1−xLixO is a type of high-entropy oxide that has high ionic conductivity at room temperature and is used as a solid electrolyte. (Mg, Co, Ni, Cu, Zn)1−xLixO was successfully synthesized from [...] Read more.
(Mg, Co, Ni, Cu, Zn)1−xLixO is a type of high-entropy oxide that has high ionic conductivity at room temperature and is used as a solid electrolyte. (Mg, Co, Ni, Cu, Zn)1−xLixO was successfully synthesized from precursor powder by applying reactive flash sintering for less than 4 min at room temperature (25 °C). AC and DC electric fields were independently applied to sinter ceramic samples; consequently, AC and DC electric field application resulted in relative densities that exceeded 90% and 80%, respectively. X-ray diffraction spectra of samples revealed the existence of a clear halite structure with an insignificant impurity phase, proving that (Mg, Co, Ni, Cu, Zn)1−xLixO crystals were successfully produced. Full article
(This article belongs to the Special Issue Advances in Ceramics and Glass: Processing, Sintering, Properties and Applications)
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20 pages, 1782 KB  
Perspective
Flash Sintering Research Perspective: A Bibliometric Analysis
by Eva Gil-González, Luis A. Pérez-Maqueda, Pedro E. Sánchez-Jiménez and Antonio Perejón
Materials 2022, 15(2), 416; https://doi.org/10.3390/ma15020416 - 6 Jan 2022
Cited by 28 | Viewed by 4611
Abstract
Flash Sintering (FS), a relatively new Field-Assisted Sintering Technique (FAST) for ceramic processing, was proposed for the first time in 2010 by Prof. Rishi Raj’s group from the University of Colorado at Boulder. It quickly grabbed the attention of the scientific community and [...] Read more.
Flash Sintering (FS), a relatively new Field-Assisted Sintering Technique (FAST) for ceramic processing, was proposed for the first time in 2010 by Prof. Rishi Raj’s group from the University of Colorado at Boulder. It quickly grabbed the attention of the scientific community and since then, the field has rapidly evolved, constituting a true milestone in materials processing with the number of publications growing year by year. Moreover, nowadays, there is already a scientific community devoted to FS. In this work, a general picture of the scientific landscape of FS is drawn by bibliometric analysis. The target sources, the most relevant documents, hot and trending topics as well as the social networking of FS are unveiled. A separate bibliometric analysis is also provided for Reaction or Reactive Flash Sintering (RFS), where not only the sintering, but also the synthesis is merged into a single step. To the best of our knowledge, this is the first study of this nature carried out in this field of research and it can constitute a useful tool for researchers to be quickly updated with FS as well as to strategize future research and publishing approaches. Full article
(This article belongs to the Topic Electromaterials for Environment & Energy)
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9 pages, 742 KB  
Article
Liquid-Film Assisted Mechanism of Reactive Flash Sintering in Oxide Systems
by Rachman Chaim and Yaron Amouyal
Materials 2019, 12(9), 1494; https://doi.org/10.3390/ma12091494 - 8 May 2019
Cited by 15 | Viewed by 3286
Abstract
Reactive flash sintering in oxide systems is analyzed assuming the formation of a liquid film at the particle contacts at the flash onset temperature. Formation of intermediate phases, as well as phase assemblage, are predicted upon optimal conditions of the electric field and [...] Read more.
Reactive flash sintering in oxide systems is analyzed assuming the formation of a liquid film at the particle contacts at the flash onset temperature. Formation of intermediate phases, as well as phase assemblage, are predicted upon optimal conditions of the electric field and current density. In single-phase impure oxides, the solidus and the solubility limit determine the flash onset temperature. In reacting binary systems, the composition of the liquidus determines primarily the reaction products during the cooling. In multicomponent systems, the oxide with the lowest flash temperature forms the interfacial liquid film, and the solid phase assemblage follows the equilibrium phase diagram. Examples from literature are consistent with reactive flash sintering and flash sintering assisted by a transient liquid film. Full article
(This article belongs to the Special Issue Athermal Field Effects in Spark Plasma Sintering and Flash Sintering )
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