An optical in-situ study of the re-oxidation kinetics of mixed valent Yb3Al5O12

Literature Information

Publication Date 2003-03-10
DOI 10.1039/B300141P
Impact Factor 3.676
Authors

M. Kreye, K. D. Becker


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Abstract

The optical spectra of blue Yb-garnet single crystals have been studied in the range of 200 to 1200 nm. The spectra exhibit absorption bands due to Yb2+ and Yb3+ ions including 4f–4f transitions on Yb3+ as well as 4f–5d transitions on Yb2+ ions, and a band due to Yb2+–Yb3+ intervalence charge-transfer (IVCT) responsible for the blue colour of the crystal. At high temperatures, the blue colour is found to bleach in an oxidising atmosphere. The oxidation reaction was studied by means of optical spectroscopy at in-situ conditions in the temperature range between 861 and 1065 °C. Basically, the oxidation kinetics were found to follow a parabolic rate law. The kinetics have been analysed in the framework of a refined model of internal oxidation accounting for both the transport of the oxidising defects and the diffusion of the reduced component Yb2+.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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