Nanocrystallinity as a Route to Metastable Phases: Rock Salt ZnO

• DOI: 10.1021/cm400293j
• Publication Date: 2013-04-03T13:38:40Z
• Authors: Andrey N. Baranov; Petr S. Sokolov; Viktor A. Tafeenko; Christian Lathe; Yan V. Zubavichus; Aleksey A. Veligz...; Mikhail V. Chukichev; Vladimir L. Soloz...
• Keywords: Nanocrystalline material; Wurtzite crystal structure; Ambient pressure; Cathodoluminescence; Thermal Stability; XANES

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