Abstract
Raman and infrared spectroscopy results of protonated and dry samples of the proton conducting double perovskites Sr 3CaZr 0.5Ta 1.5O 8.75 and Ba 3Ca 1.18Nb 1.82O 8.73 (BCN18) are presented. As confirmed by the Raman spectra, the incorporation of protons leads to only small distortions in the host lattice of the perovskites. However, the intensity growth of a band at approximately 650 cm − 1 in the Raman spectrum of Sr 3CaZr 0.5Ta 1.5O 8.75 after protonation may be related to a symmetry reduction towards a monoclinic structure. The O–H stretch region in the infrared spectra of Sr 3CaZr 0.5Ta 1.5O 8.75 and BCN18 are quite different. Stronger bands in the 2000–2500 cm − 1 range in Sr 3CaZr 0.5Ta 1.5O 8.75 may be related to the higher concentration of oxygen vacancies in this material after protonation.
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