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Raman and infrared spectra of doped La 8+ x Sr 2− y (SiO 4 ) 6 O 2+δ compounds compared to the ab initio ‐obtained spectroscopic characteristics of fully stoichiometric La 8 Sr 2 (SiO 4 ) 6 O 2
Author(s) -
Smirnov M.,
Sukhomlinov S.,
Mirgorodsky A.,
Masson O.,
Béchade E.,
Colas M.,
MerleMéjean T.,
Julien I.,
Thomas P.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2626
Subject(s) - raman spectroscopy , infrared spectroscopy , infrared , chemistry , analytical chemistry (journal) , doping , ion , stoichiometry , ionic bonding , conductivity , oxygen , ab initio quantum chemistry methods , materials science , molecule , physics , optics , optoelectronics , organic chemistry , chromatography
Vibrational spectroscopy data were used to gain insight into the possible locations of extra oxygen ions introduced into La 8+ x Sr 2− y (SiO 4 ) 6 O 2+δ compounds to raise their ionic conductivity. Perturbations observed in the Raman and infrared spectra of these compounds with increasing δ were explained by using the ab initio calculation results for the fully stoichiometric ( x = y = δ = 0) lattice. This allowed the inference that the extra oxygen ions are incorporated into LaO tunnel‐like fragments inherent in the studied structures. Copyright © 2010 John Wiley & Sons, Ltd.