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Perovskite oxides are being increasingly integrated into thin films as functional layers for electrochemical energy conversion, information storage or sensing. Their coupled electro-chemo-mechanical properties determining their performance are often difficult to measure. Here we propose to use vibrational Raman spectroscopy to probe chemo-mechanics by measuring the coupling of the lattice volumetric changes (mechanic) to chemical expansion (chemo). This is done by measuring in situ Raman spectra on an electrochemical cell with a Sr(Ti,Fe)O_{3–y} working electrode whose oxygen stoichiometry is controlled by an applied bias.