The chromium site in doped glassy lithium tetraborate

Autor:	Ya. V. Burak, Axel Enders, John W. McClory, T. D. Kelly, Elena Echeverria, Peter A. Dowben, Sumit Beniwal, Volodymyr Adamiv, James C. Petrosky
Rok vydání:	2014
Předmět:	Materials science Absorption spectroscopy Extended X-ray absorption fine structure Dopant Coordination number Doping Mineralogy chemistry.chemical_element Condensed Matter Physics Bond length Crystallography Chromium chemistry General Materials Science Lithium
Zdroj:	Materials Chemistry and Physics. 147:492-495
ISSN:	0254-0584
Popis:	Using extended X-ray absorption fine structure (EXAFS) spectroscopy, we find that Cr substitutes primarily in the Li þ site as a dopant in lithium tetraborate Li2B4O7 glasses, in this case 98.4Li2B4O7e1.6Cr2O3 or nominally Li1.98Cr0.025B4O7. This strong preference for a single site is nonetheless accompanied by site distortions and some site disorder, helping explain the optical properties of chromium doped Li2B4O7 glasses. The resulting O coordination shell has a contraction of the CreO bond lengths as compared to the LieO bond lengths. There is also an increase in the O coordination number.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8b210b9726879a2342b24ca4981de3c5 https://doi.org/10.1016/j.matchemphys.2014.05.021 Zobrazit plný text záznamu Full Text from ScienceDirect