Nanocrystallinity as a Route to Metastable Phases: Rock Salt ZnO

Baranov, A. N.; Sokolov, P. S.; Tafeenko, V. A.; Lathe, Christian; Zubavichus, Y. V.; Veligzhanin, A. A.; Chukichev, M. V.; Solozhenko, V. L.

doi:10.1021/cm400293j

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Nanocrystallinity as a Route to Metastable Phases: Rock Salt ZnO

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Baranov, A. N.
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Sokolov, P. S.
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Tafeenko, V. A.
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Lathe, Christian
CGS Centre for Geological Storage, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zubavichus, Y. V.
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Veligzhanin, A. A.
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Chukichev, M. V.
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Solozhenko, V. L.
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Baranov, A. N., Sokolov, P. S., Tafeenko, V. A., Lathe, C., Zubavichus, Y. V., Veligzhanin, A. A., Chukichev, M. V., Solozhenko, V. L. (2013): Nanocrystallinity as a Route to Metastable Phases: Rock Salt ZnO. - Chemistry of Materials, 25, 9, 1775-1782.
https://doi.org/10.1021/cm400293j

https://gfzpublic.gfz-potsdam.de/pubman/item/item_247540

Abstract

A synthesis route to rock salt zinc oxide (rs-ZnO), high-pressure phase metastable at ambient conditions, has been developed. High-purity bulk nanocrystalline rs-ZnO has been synthesized from wurtzite (w) ZnO nanopowders at 7.7 GPa and 770–820 K and, for the first time, recovered at normal conditions. Structure, phase composition, and thermal phase stability of recovered rs-ZnO have been studied by synchrotron X-ray powder diffraction and X-ray absorption spectroscopy (XANES and EXAFS) at ambient pressure. Phase purity of rs-ZnO was achieved by usage of w-ZnO nanoparticles with a narrow size distribution as a pristine material synthesized by various chemical methods. At ambient pressure, rs-ZnO could be stable up to 360 K. The optical properties of rs-ZnO have been studied by conventional cathodoluminescence in high vacuum at room and liquid-nitrogen temperatures. The nanocrystalline rs-ZnO at 300 and 77 K has shown bright blue luminescence at 2.42 and 2.56 eV, respectively.