Please use this identifier to cite or link to this item:
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
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
ISSN: 0020-1669
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.