Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/6480
Title: Structural study of the apatite Nd8Sr2Si6O26 by laue neutron diffraction and single-crystal raman spectroscopy
Authors: An, T
Orera, A
Baikie, T
Herrin, JS
Piltz, RO
Slater, PR
Sanjuán, ML
Keywords: Electrolytes
Monocrystals
Fuel cells
Neutron diffraction
Raman spectroscopy
Oxygen ions
Issue Date: 20-Aug-2014
Publisher: American Chemical Society
Citation: An, T., Orera, A., Baikie, T., Herrin, J. S., Piltz, R. O., Slater, P. R., & Sanjuán, M. L. (2014). Structural Study of the Apatite Nd8Sr2Si6O26 by Laue Neutron Diffraction and Single-Crystal Raman Spectroscopy. Inorganic Chemistry, 53(17), 9416-9423. doi: 10.1021/ic501558r
Abstract: A single-crystal structure determination of Nd8Sr2Si6O26 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 Nd8Sr2Si6O26 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
Gov't Doc #: 6347
URI: http://pubs.acs.org/doi/abs/10.1021/ic501558r
http://apo.ansto.gov.au/dspace/handle/10238/6480
ISSN: 0020-1669
Appears in Collections:Journal Articles

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