In Situ Method Correlating Raman Vibrational Characteristics to Chemical Expansion via Oxygen Nonstoichiometry of Perovskite Thin Films

摘要: Effective integration of perovskite films into devices requires knowledge their electro-chemomechanical properties. Raman spectroscopy is an excellent tool for probing such properties as the films' vibrational characteristics couple to lattice volumetric changes during chemical expansion. While are typically accessed by analyzing shifts a function pressure, stress, or temperature, methods can be impractical thin and do not capture information on An in situ technique using electrochemical titration cell change oxygen nonstoichiometry model film, Sr(Ti,Fe)O3-y  , reported correlated material's How select appropriate mode track evolution discussed. Subsequently, frequency stretching around Fe4+ tracked, it decreases reduction material expands increases reoxidation shrinks. This methodology pumping oxide enables future operando measurements even small volumes, typical applications electrodes electrolytes utilized energy conversion memory devices.