Do we have a probe for the initial stages of solid state reactions?

Literature Information

Publication Date 2003-04-03
DOI 10.1039/B300135K
Impact Factor 3.676
Authors

I. Davoli, F. D'Acapito


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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.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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