Synthesis and thermal stability of cubic ZnO in the salt nanocomposites |
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| Authors: | P. S. Sokolov A. N. Baranov Zh. V. Dobrokhotov V. L. Solozhenko |
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| Affiliation: | 1.Laboratory of Mechanical and Thermodynamic Properties of Materials, LPMTM-CNRS,Université Paris 13,Villetaneuse,France;2.Department of Materials Science,M. V. Lomonosov Moscow State University,Moscow,Russian Federation;3.Department of Chemistry,M. V. Lomonosov Moscow State University,Moscow,Russian Federation;4.N. S. Kurnakov Institute of General and Inorganic Chemistry,Russian Academy of Sciences,Moscow,Russian Federation |
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| Abstract: | Cubic zinc oxide (rs-ZnO), metastable under normal conditions, was synthesized from the wurtzite modification (w-ZnO) at 7.7 GPa and ∼800 K in the form of nanoparticles isolated in the NaCl matrix. The phase transition rs-ZnO → w-ZnO in nanocrystalline zinc oxide under ambient pressure was experimentally studied for the first time by using differential scanning calorimetry and high-temperature X-ray diffraction analysis. It was shown that the transition occurs in the temperature range from 370 to 430 K and its enthalpy at 400 K is −10.2 ± 0.5 kJ mol−1. |
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