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A simple and straightforward mechanochemical synthesis of the far-from-equilibrium zinc aluminate, ZnAl₂O₄, and its response to thermal treatment

Fabian, M. 1; Bottke, P.; Girman, V.; Düvel, A.; Da Silva, K. L. 1; Wilkening, M.; Hahn, H. 1; Heitjans, P.; Sepelak, V. 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


Zinc aluminate (ZnAl2O4) nanoparticles with an average size of about 10 nm are synthesized via one-step mechanochemical processing of the ZnO : g-Al2O3 stoichiometric mixture at ambient temperature. The mechanochemically induced formation of the phase is followed by XRD and 27Al MAS NMR. Highresolution TEM studies reveal a non-uniform nanostructure of mechanosynthesized aluminate consisting of ordered grains surrounded or separated by disordered surface and interfacial regions. Due to the capability of 27Al MAS NMR to probe the local environment of the Al cations, valuable insights into the short-range structure of ZnAl2O4 on the °Angstr¨om length scale are provided. It is demonstrated that the as-prepared aluminate possesses a partly inverse spinel structure with a far-from equilibrium arrangement of cations and distorted polyhedra, which are spatially confined to the surface and interfacial regions with a volume fraction of ca. 50% and a thickness of ca. 1 nm. The response of the nanostructured ZnAl2O4 to subsequent thermal treatment is further investigated. It turned out that the thermally induced grain growth is accompanied by a release of microstrain, by a shrinkage of the lattice parameter, as well as by a variation in the oxygen parameter and metal–oxygen bond lengths. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/110102622
Veröffentlicht am 30.10.2018
DOI: 10.1039/C5RA09098A
Zitationen: 35
Web of Science
Zitationen: 32
Zitationen: 34
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen-ID: 110102622
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in RSC Advances
Verlag Royal Society of Chemistry (RSC)
Band 5
Heft 67
Seiten 54321-54328
Nachgewiesen in Web of Science
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