Structural study of the apatite Nd8Sr2Si6O26 by Laue neutron diffraction and single-crystal raman spectroscopy
| Autor: | Timothy J. White, Peter R. Slater, Tom Baikie, Ross O. Piltz, Alodia Orera, María Luisa Sanjuán, Tao An, J. S. Herrin |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Agency for Science, Technology and Research A*STAR (Singapore), School of Materials Science and Engineering, Energy Research Institute @ NTU (ERI@N) |
| Rok vydání: | 2014 |
| Předmět: |
Raman spectrum
Single crystal Neutron diffraction Oxide Electrolyte Apatite Solid electrolyte Inorganic Chemistry symbols.namesake chemistry.chemical_compound Crystallography chemistry visual_art symbols visual_art.visual_art_medium Fuel cells Physical and Theoretical Chemistry Neodymium silicate Raman spectroscopy |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | et al. A single-crystal structure determination of Nd8Sr 2Si6O26 apatite, a prototype intermediate-temperature electrolyte for solid oxide fuel cells grown by the floating-zone method, was completed using the combination of Laue neutron diffraction and Raman spectroscopy. While neutron diffraction was in good agreement with P63/m symmetry, the possibility of P63 could not be convincingly excluded. This ambiguity was removed by the collection of orientation-dependent Raman spectra that could only be consistent with P63/m. The composition of Nd8Sr2Si 6O26 was independently verified by powder X-ray diffraction in combination with electron probe microanalysis, with the latter confirming a homogeneous distribution of Sr and the absence of chemical zonation commonly observed in apatites. This comprehensive crystallochemical description of Nd8Sr2Si6O26 provides a baseline to quantify the efficacy of cation vacancies, oxygen superstoichiometry, and symmetry modification for promoting oxygen-ion mobility. © 2014 American Chemical Society. This work was supported by A*STAR (Agency for Science, Technology and Research) SERC Grant 082 101 0021 (“Optimization of Apatite Anion Sublattices in Solid Oxide Fuel Cell Electrolytes”) and by Spanish Government Grant MAT2010-19837-C06-06. A.O. acknowledges financial support provided by the Spanish Ministerio de Ciencia e Innovación through a Juan de la Cierva contract. |
| Databáze: | OpenAIRE |
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