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Characterization of the LSTO ceramics sintered under three different conditions with an increasingly strong reducing environment. (a) XRD pattern for the three LSTO samples. (b) XPS Ti 2p core levels for the three LSTO samples. (c–e) SEM micrographs showing grain sizes of the LSTO-H2, LSTO-H2-C, and LSTO-H2-in-C samples, respectively.
