Repetitive grain growth behavior with increasing temperature and grain boundary roughening in a model nickel system

Jung, Sang Hyun; Kang, Suk–Joong L.

doi:10.1016/j.actamat.2014.02.016

Cited by 32 publications

(27 citation statements)

References 60 publications

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“…Examples of microstructure control with a changing Δ g c can be found in previous experiments with BaTiO 3 and Ni . In TiO 2 ‐excess BaTiO 3 , grain‐boundary roughening occurs with decreasing oxygen partial pressure, Po 2 .…”

Section: Microstructure Evolution In Polycrystals: Model and Principlementioning

confidence: 85%

“…Therefore, the initial powder determines Δ g max at the beginning of the sintering of a powder compact. The critical driving force Δ g c varies with temperature, doping and atmosphere, including oxygen partial pressure in particular . As the temperature increases, Δ g c decreases because of a reduction in the step free energy.…”

Section: Microstructure Evolution In Polycrystals: Model and Principlementioning

confidence: 99%

“…54 This mechanism, however, does not provide an explanation as to why AGG occurs only in some specific systems and not in other solute-segregated systems. In addition, this mechanism cannot predict the stagnation of grain growth (stagnant grain growth: SGG), a recently observed growth mode in systems that exhibit AGG under specific ranges of temperature 68 and oxygen partial pressure. 65,69 Comprehensively different grain growth behavior in samples with similar solute segregation, normal and stagnant (or abnormal), 65,69 and the variation in grain growth behavior with respect to the solute concentration 70 can also not be explained by the solute drag mechanism.…”

Section: Microstructure Evolution In Polycrystals: Model and Prinmentioning

confidence: 99%

“…73,75 This mechanism can explain the occurrence of various types of grain growth behavior in polycrystals and provides the groundwork for the discovery of the general principle of microstructural evolution. 48,74,76 (2) Mixed Control Mechanism of Boundary Migration and the Principle of Microstructural Evolution Many investigations on grain growth [63][64][65][68][69][70][77][78][79][80][81][82][83][84][85][86][87] have shown that grain growth behavior is largely governed by the grain-boundary structure, either rough (atomically disordered) or faceted (atomically ordered). Non-NGG, in particular abnormal grain growth, occurs only in faceted systems.…”

Section: Microstructure Evolution In Polycrystals: Model and Prinmentioning

confidence: 99%

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Solid‐State Conversion of Single Crystals: The Principle and the State‐of‐the‐Art

et al. 2015

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Solid‐state conversion of single crystals from polycrystalline materials has the advantages of cost‐effectiveness, chemical homogeneity, and versatility over the conventional melt growth and solution growth methods, particularly for systems with high melting points, incongruent melting, high reactivity (volatility), and phase transformations at high temperature. Nevertheless, for commercial production, this technique has only been successful in a few limited systems, in particular ferroelectric systems. This is mostly because of the difficulty in controlling the microstructure, particularly suppressing grain growth in the polycrystal during its conversion. This article describes the principle and the current status of the solid‐state conversion of single crystals. We first introduce the recently developed principle of microstructural evolution to explain the basis of the microstructure control in polycrystals for solid‐state conversion. We then report recent technical developments in fabricating single crystals by the solid‐state single crystal growth (SSCG) method and their physical properties. The SSCG method is expected to be studied and utilized more widely in fabricating single crystals with complex compositions as a strong alternative to the melt growth and solution growth methods.

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Section: Microstructure Evolution In Polycrystals: Model and Principlementioning

confidence: 85%

Section: Microstructure Evolution In Polycrystals: Model and Principlementioning

confidence: 99%

Section: Microstructure Evolution In Polycrystals: Model and Prinmentioning

confidence: 99%

Section: Microstructure Evolution In Polycrystals: Model and Prinmentioning

confidence: 99%

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Solid‐State Conversion of Single Crystals: The Principle and the State‐of‐the‐Art

et al. 2015

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“…In the case of grain growth, the correlation between the boundary faceting and the boundary migration, as well as grain growth behavior, has been much more carefully studied . As in the case of densification, Figure indicates the presence of a critical driving force for grain growth in a sample with faceted boundaries.…”

Section: Fundamentals Of Sintering and Microstructure Evolutionmentioning

confidence: 99%

Current understanding and future research directions at the onset of the next century of sintering science and technology

2017

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Sintering and accompanying microstructural evolution is inarguably the most important step in the processing of ceramics and hard metals. In this process, an ensemble of particles is converted into a coherent object of controlled density and microstructure at an elevated temperature (but below the melting point) due to the thermodynamic tendency of the particle system to decrease its total surface and interfacial energy. Building on a long development history as a major technological process, sintering remains among the most viable methods of fabricating novel ceramics, including high surface area structures, nanopowder-based systems, and tailored structural and functional materials. Developing new and perfecting existing sintering techniques is crucial to meet ever-growing demand for a broad range of technologically significant systems including, for example, fuel and solar cell components, electronic packages and elements for computers and wireless devices, ceramic and metal-based bioimplants, thermoelectric materials, materials for thermal management, and materials for extreme environments.In this study, the current state of the science and technology of sintering is presented. This study is, however, not a comprehensive review of this extremely broad field. Furthermore, it only focuses on the sintering of ceramics. The fundamentals of sintering, including the thermodynamics and kinetics for solid-stateand liquid-phase-sintered systems are described. This study summarizes that the sintering of amorphous ceramics (glasses) is well understood and there is excellent agreement between theory and experiments. For crystalline materials, attention is drawn to the effect of the grain boundary and interface structure on sintering and microstructural evolution, areas that are expected to be significant for future studies. Considerable emphasis is placed on the topics of current research, including the sintering of composites, multilayered systems, microstructure-based models, multiscale models, sintering under external stresses, and innovative and novel sintering approaches, such as field-assisted sintering. This study includes the status of these subfields, the outstanding challenges and opportunities, and the outlook of progress in sintering research. Throughout the manuscript, we highlight the important lessons learned from sintering fundamentals and their implementation in practice.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Insight of Synthesis of Single Crystal Ni‐Rich LiNi_1−x−yCo_xMn_yO₂ Cathodes

Wu,

Deng

et al. 2024

Advanced Energy Materials

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Single‐crystal Ni‐rich LiNi1−x−yCoxMnyO2 (NCM) cathodes have garnered widespread attention in the lithium‐ion battery community due to their unique advantages in mechanical performance and their ability to minimize interfacial electrochemical side reactions. The synthesis of single‐crystal materials with monodisperse and appropriate size, minimal lattice defects, and highly ordered structures is the key for high‐performance batteries. However, achieving this goal poses challenges due to the lack of in‐depth understanding regarding specific experimental parameters and the solid reaction mechanism during the synthesis process. In this review, the aim is to provide an in‐depth analysis of the critical process parameters involved in the synthesis and their impact on crystal morphology, structure, and electrochemical performance. Consequently, the first section focuses on the effect of the precursor morphology, lithium salt, atmosphere, and sintering procedure. In the second section, the study delves into an in‐depth discussion of the solid reaction and crystal growth mechanism. Lastly, it is concluded by highlighting the prospects and challenges associated with the synthesis and application of single‐crystal Ni‐rich NCM cathodes.

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Repetitive grain growth behavior with increasing temperature and grain boundary roughening in a model nickel system

Cited by 32 publications

References 60 publications

Solid‐State Conversion of Single Crystals: The Principle and the State‐of‐the‐Art

Solid‐State Conversion of Single Crystals: The Principle and the State‐of‐the‐Art

Current understanding and future research directions at the onset of the next century of sintering science and technology

Insight of Synthesis of Single Crystal Ni‐Rich LiNi_1−x−yCo_xMn_yO₂ Cathodes

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Repetitive grain growth behavior with increasing temperature and grain boundary roughening in a model nickel system

Cited by 32 publications

References 60 publications

Solid‐State Conversion of Single Crystals: The Principle and the State‐of‐the‐Art

Solid‐State Conversion of Single Crystals: The Principle and the State‐of‐the‐Art

Current understanding and future research directions at the onset of the next century of sintering science and technology

Insight of Synthesis of Single Crystal Ni‐Rich LiNi1−x−yCoxMnyO2 Cathodes

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Insight of Synthesis of Single Crystal Ni‐Rich LiNi_1−x−yCo_xMn_yO₂ Cathodes