Do we have a probe for the initial stages of solid state reactions?
- 3 April 2003
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 5 (11) , 2244-2247
- https://doi.org/10.1039/b300135k
Abstract
The aim of this work is to show that ReflEXAFS can be used as a tool for investigating the initial stages of solid state reactions, when local chemical equilibrium is not yet attained at the interfaces. A very classical solid state reaction, i.e. the formation of Ni–Al spinel starting from the parent oxides (NiO+Al2O3 →NiAl2O4) has been investigated by monitoring with Ni–K edge ReflEXAFS the time evolution of the local chemical environment of Ni in a reacting NiO thin layer. At temperatures above 1000°C, a progressive evolution from an NiO environment to a spinel environment has been obtained with increasing firing times. At lower temperatures ( 930°C) the NiO film does not react but undergoes a structural rearrangement, which is seemingly related to the process by which local chemical equilibrium is attained at the interface.Keywords
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