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Structural study of the apatite Nd8Sr2Si6O26 by Laue neutron diffraction and single-crystal raman spectroscopy

AutorAn, Tao; Orera, A.; Slater, P. R.; Sanjuán, M. L.
Fecha de publicación2014
EditorAmerican Chemical Society
CitaciónInorganic Chemistry 53(17): 9416-9423 (2014)
ResumenA 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.
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URIhttp://hdl.handle.net/10261/120952
DOI10.1021/ic501558r
Identificadoresdoi: 10.1021/ic501558r
issn: 0020-1669
e-issn: 1520-510X
Aparece en las colecciones: (ICMA) Artículos
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