Kinetics of the Wurtzite-to-Rock-Salt Phase Transformation in ZnO at High Pressure

Kinetics of the wurtzite-to-rock-salt transformation in ZnO has been studied in the 5–7 GPa pressure range at temperatures below the activation of diffusion processes. The detailed analysis of non-isothermal experimental data using the general evolution equation describing the kinetics of direct pha...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2011-05, Vol.115 (17), p.4354-4358
Main Authors: Solozhenko, Vladimir L, Kurakevych, Oleksandr O, Sokolov, Petr S, Baranov, Andrey N
Format: Article
Language:English
Subjects:
A: Kinetics, Spectroscopy
Condensed Matter
Diffusion
Kinetics
Other
Phase Transition
Physics
Pressure
Salts - chemistry
Temperature
Zinc Oxide - chemistry
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Summary:Kinetics of the wurtzite-to-rock-salt transformation in ZnO has been studied in the 5–7 GPa pressure range at temperatures below the activation of diffusion processes. The detailed analysis of non-isothermal experimental data using the general evolution equation describing the kinetics of direct phase transformations in solids allowed us to study the kinetic particularities of both nucleation and growth of the rock-salt phase in parent wurtzite ZnO. The main rate-limiting processes are thermally activated nucleation (E N = 383 kJ mol–1 at 6.9 GPa) and thermally nonactivated (most probably quasi-martensitic) growth (k G = 0.833 min–1 at 6.9 GPa). The high impact of thermal deactivation of nucleation places has been evidenced in the case of slow heating, which indirectly indicates that the rs-ZnO nucleation places are mainly produced by pressure-induced stresses in the parent phase.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp201544f