Raman and infrared spectra of doped La<sub>8+<i>x</i></sub>Sr<sub>2−<i>y</i></sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2+δ</sub> compounds compared to the <b><i>ab initio</i></b>‐obtained spectroscopic characteristics of fully stoichiometric La<sub>8</sub>Sr<sub>2</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub>

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<jats:title>Abstract</jats:title><jats:p>Vibrational spectroscopy data were used to gain insight into the possible locations of extra oxygen ions introduced into La<jats:sub>8+<jats:italic>x</jats:italic></jats:sub>Sr<jats:sub>2−<jats:italic>y</jats:italic></jats:sub>(SiO<jats:sub>4</jats:sub>)<jats:sub>6</jats:sub>O<jats:sub>2+δ</jats:sub> 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 <jats:italic>ab initio</jats:italic> calculation results for the fully stoichiometric (<jats:italic>x</jats:italic> = <jats:italic>y</jats:italic> = δ = 0) lattice. This allowed the inference that the extra oxygen ions are incorporated into LaO tunnel‐like fragments inherent in the studied structures. Copyright © 2010 John Wiley & Sons, Ltd.</jats:p>

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