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Updated: May 7, 2026
High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia (YSZ) Scaffolds by In Situ Carbon Templating Xerogels
Published on: April 16, 2017
Dilpuneet S Aidhy1, Yanwen Zhang, William J Weber
1Materials Science and Technology Division, Oak Ridge National Laboratory, One Bethel Valley, PO Box 2008, MS 6138, Oak Ridge, TN 37831, USA. aidhyds@ornl.gov.
Nanocrystalline ceramic-oxides have promising properties but are prone to grain growth, which limits their usefulness. This study used atomistic simulations to explore how grain growth can be controlled in these materials. The researchers found that traditional methods based on size mismatch do not work in ceramic-oxides. Instead, the interactions between dopants and oxygen vacancies are the key to stabilizing grain boundaries. They identified migration energy and binding energy as the main factors controlling grain growth. These findings provide a new framework for designing stable nanocrystalline ceramic-oxides. The study also supports previous experimental results and offers a path for future research in this area.
Area of Science:
Background:
Nanocrystalline ceramic-oxides possess unique properties that could enhance performance in various applications. However, these materials often undergo grain growth, which degrades their structural and functional advantages. Prior research has shown that in metallic systems, grain growth can be suppressed by introducing dopants with large size mismatches. This approach has not been effective in ceramic-oxides. That uncertainty drove the need to explore alternative mechanisms specific to ceramic-oxides. No prior work had resolved how grain growth could be controlled in these materials. Existing studies lacked a clear understanding of the interactions between dopants and oxygen vacancies. This gap motivated the use of atomistic simulations to identify new design principles. The goal was to determine if grain growth could be prevented in ceramic-oxides through controlled dopant interactions. This paper contributes by identifying the key factors that influence grain growth in ceramic-oxides.
Purpose Of The Study:
The aim of this study was to develop a framework for stabilizing nanocrystalline grains in ceramic-oxides. The specific problem addressed was the tendency of these materials to undergo grain growth, which limits their practical use. The motivation came from the lack of a clear mechanism to control grain growth in ceramic-oxides. The researchers sought to understand how dopants could be used to prevent grain growth. They focused on ceria as a model system for ceramic-oxides. The study aimed to identify the interactions that govern grain boundary stability. The goal was to move beyond the traditional size mismatch approach used in metals. The findings could lead to new strategies for stabilizing nanocrystalline ceramic-oxides.
Main Methods:
The researchers used atomistic simulations to study grain boundary behavior in ceria. They selected ceria as a model material system for ceramic-oxides. The simulations focused on the interactions between dopants and oxygen vacancies. They examined how dopant migration energy affects grain boundary stability. The study also considered the binding energy between dopants and oxygen vacancies. These parameters were calculated using computational models. The simulations allowed the researchers to track changes in grain boundary structure. The results were compared with experimental observations to validate the framework.
Main Results:
The strongest finding was that dopant-oxygen vacancy interactions control grain growth in ceramic-oxides. The researchers found that migration energy and binding energy are key factors. They observed that large size mismatches between host and dopant atoms are not effective in ceramic-oxides. Instead, the presence of oxygen vacancies significantly influences dopant behavior. The simulations showed that dopant migration energy decreases in the presence of oxygen vacancies. The binding energy between dopants and oxygen vacancies was found to be critical. These findings align with previous experimental results on grain growth suppression. The study provides a new framework for designing stable grain boundaries in ceramic-oxides.
Conclusions:
The authors propose that dopant-oxygen vacancy interactions are the primary mechanism for stabilizing grain boundaries in ceramic-oxides. They suggest that migration energy and binding energy are the controlling factors in grain growth. The study confirms that traditional size mismatch approaches are not applicable to ceramic-oxides. The findings provide a new design framework for dopant selection in ceramic-oxides. The researchers emphasize the importance of oxygen vacancy interactions in grain boundary stability. The results support the use of ceria as a model system for further studies. The study contributes to the development of stable nanocrystalline ceramic-oxides. The authors suggest that this framework could be extended to other ceramic-oxide systems.
The main mechanism is the interaction between dopants and oxygen vacancies, specifically migration and binding energy.
In ceramic-oxides, grain growth is controlled by dopant-oxygen vacancy interactions, not by size mismatch as in metals.
Oxygen vacancies influence dopant migration and binding energy, which are key to grain boundary stability.
The simulation results agree with and explain previous experimental observations on grain growth suppression.
Migration energy determines how easily dopants move in the presence of oxygen vacancies, affecting grain boundary stability.
The authors suggest that this framework could be extended to other ceramic-oxide systems to design stable nanocrystalline materials.
