Publication date: 10th April 2024
Raman spectroscopy is a non-destructive vibrational spectroscopy technique which offers valuable insights into the structural characteristics of materials by using scattered light to measure the vibrational energy modes of a sample. As the vibrational frequency of a specific mode is inversely proportional to the effective reduced mass, its wavenumber is sensitive to the mass of the atoms constituting the molecule or the crystal, and varies for different isotopes. It is thus possible to determine the concentration of a specific isotope in a material and to measure its spatial or temporal variations by carrying out in situ Raman measurements.
The Isotope Exchange Raman Spectroscopy (IERS) technique is based in the continuous measurement of a specific Raman mode of a given material (such as an oxide) while it is exposed to an isotope enriched atmosphere (e.g. 18O) within a temperature-controlled environment. It allows for the estimation of the isotopic concentration as a function of time (and/or position), facilitating the measurement of ion transport kinetics, including oxygen surface exchange and diffusion coefficients, in functional materials. This innovative approach was first developed for gadolinium-doped ceria (CGO), a well know ionic conducting oxide typically used as an electrolyte in solid oxide cells.[1] For thin films we demonstrated that employing various sample configurations allows for the in situ measurement of both in-plane and out-of-plane kinetic coefficients. In addition, the IERS technique has been further developed and expanded to the study of several mixed ionic electronic perovskites thin films, but also to bulk materials and composites. During my presentation, I will discuss the latest findings, as well as the advantages and limitations of the technique.
This work has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no. 824072 (Har- vestore) and no. 101017709 (EPISTORE) and under the Marie Skłodowska- Curie grant agreements no. 840787 (Thin-CATALYzER) and no. 746648 (PerovSiC).
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