The microstructure and dielectric properties of A‐site‐excess and stoichiometric‐composition strontium calcium titanate ((Sr,Ca)TiO 3 ) ceramics were investigated in the present study. Ruddlesden‐Popper‐type planar faults in A‐site‐excess specimens were observed using high‐resolution scanning transmission electron microscopy (HR‐STEM). STEM microchemical analysis, calculation of the high‐resolution image using a multislice method, and structural‐energy calculation further revealed that calcium ions selectively occupied the cation sites of the faults. An observed shift of the peak dielectric constant to low temperature and the expansion of the lattice parameter of the A‐site‐excess specimen were attributed to the selective occupation of the cation sites of the planar faults by calcium ions.
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Fujimoto et al. (1998) studied this question.
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