Optically measured diffusion constants of oxygen vacancies in MgO

Autor:	Don O. Henderson, Akira Ueda, P. W. Wang, Andrey Zavalin, Richard Mu, Y. S. Tung, M. H. Wu
Rok vydání:	2001
Předmět:	Valence (chemistry) Absorption spectroscopy Annealing (metallurgy) Reducing atmosphere Inorganic chemistry Analytical chemistry chemistry.chemical_element Activation energy Condensed Matter Physics Oxygen chemistry Impurity Oxidizing agent General Materials Science
Zdroj:	Journal of Physics: Condensed Matter. 13:5535-5544
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/13/23/313
Popis:	We report the estimation of diffusion constants for oxygen vacancies in MgO based on optical absorption spectra. MgO single crystals were annealed in a reducing atmosphere (H2 + Ar) to create oxygen vacancies and the samples were annealed in an oxidizing atmosphere (O2 + Ar) to annihilate them. Fe3+ impurities in the MgO samples were utilized to monitor the degree of reduction or oxidation of the samples during the annealing cycle. An activation energy of 3.08 eV for the diffusion of oxygen vacancies (F-centres) in MgO was obtained, based on the absorption measurements of Fe3+ band.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::159fc948a96dcf9176b94cf17e97ddd9 https://doi.org/10.1088/0953-8984/13/23/313 Zobrazit plný text záznamu