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

Authors:

13 April 2011

journal article
research article
Published by American Chemical Society (ACS) in The Journal of Physical Chemistry A

Vol. 115 (17) , 4354-4358
DOI:10.1021/jp201544f
PMID:21488624

Abstract

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.

Keywords

This publication has 19 references indexed in Scilit:

Synthesis of rock-salt MeO–ZnO solid solutions (Me=Ni²⁺, Co²⁺, Fe²⁺, Mn²⁺) at high pressure and high temperature
High Pressure Research, 2008
Kinetics of high-pressure mineral phase transformations using in situ time-resolved X-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and treatment
Mineralogical Magazine, 2008
High-precisionin situinvestigation of the kinetics of the high-pressure phase transition in $Ca F_{2}$ including the initial transformation stages
Physical Review B, 2006
Pressure-Induced Crossover between Diffusive and Displacive Mechanisms of Phase Transitions in Single-Crystalline $α − {G e O}_{2}$
Physical Review Letters, 2003
Trapping of cubic ZnO nanocrystallites at ambient conditions
Applied Physics Letters, 2002
Grain Nucleation and Growth During Phase Transformations
Science, 2002
Kinetics of Diamond Crystallization from the Melt of the Fe−Ni−C System
The Journal of Physical Chemistry B, 2002
Synchrotron radiation studies of the kinetics of cBN crystallization in the NH4F–BN system
Physical Chemistry Chemical Physics, 2002
Phase transition of ZnO under high pressure and temperature
Proceedings of the Japan Academy, Series B, 1999
Kinetics of cBN crystallization in the Li3N-BN system at 6.6 GPa
Diamond and Related Materials, 1998