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Thin water films an...
Thin water films and particle morphology evolution in nanocrystalline MgO
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- Thomele, Daniel (author)
- Paris Lodron Universität Salzburg,Paris Lodron University of Salzburg
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- Gheisi, Amir R. (author)
- Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
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- Niedermaier, Matthias (author)
- Paris Lodron Universität Salzburg,Paris Lodron University of Salzburg
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- Elsässer, Michael S. (author)
- Paris Lodron Universität Salzburg,Paris Lodron University of Salzburg
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- Bernardi, J. (author)
- Technische Universität Wien,Vienna University of Technology
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- Grönbeck, Henrik, 1966 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Diwald, O. (author)
- Paris Lodron Universität Salzburg,Paris Lodron University of Salzburg
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(creator_code:org_t)
- 2018-05-30
- 2018
- English.
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In: Journal of the American Ceramic Society. - : Wiley. - 0002-7820 .- 1551-2916. ; 101:11, s. 4994-5003
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Abstract
Subject headings
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- A key question in the field of ceramics and catalysis is how and to what extent residual water in the reactive environment of a metal oxide particle powder affects particle coarsening and morphology. With X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM), we investigated annealing-induced morphology changes on powders of MgO nanocubes in different gaseous H2O environments. The use of such a model system for particle powders enabled us to describe how adsorbed water that originates from short exposure to air determines the evolution of MgO grain size, morphology, and microstructure. While cubic nanoparticles with a predominant abundance of (100) surface planes retain their shape after annealing to T = 1173 K under continuous pumping with a base pressure of water p(H2O) = 10−5 mbar, higher water partial pressures promote mass transport on the surfaces and across interfaces of such particle systems. This leads to substantial growth and intergrowth of particles and simultaneously favors the formation of step edges and shallow protrusions on terraces. The mass transfer is promoted by thin films of water providing a two-dimensional solvent for Mg2+ ion hydration. In addition, we obtained direct evidence for hydroxylation-induced stabilization of (110) faces and step edges of the grain surfaces.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Keramteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Ceramics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- grain growth
- interfaces
- magnesium oxide
- coarsening
Publication and Content Type
- art (subject category)
- ref (subject category)
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