Figure 1

Powder diffraction patterns and their Rietveld refinements for the five samples in the study. The Rietveld refinements for STO, STMO, and SLTO were performed with the cubic Pm\(\bar{3}\)m space group, while those for SLTMO2 and SLTMO4 were performed with the tetragonal I4/mcm. Red symbols and light blue lines denote the observed and calculated diffraction patterns, respectively. Dark blue lines in (a,b) denote the difference between the observed and calculated diffraction patterns. Green vertical bars denote calculated peak positions. (a,b) The full diffraction patterns of (a) STO and (b) SLTMO4. (c–g) Parts of the diffraction patterns in the region of d = 0.95–1.4 Å for (c) STO, (d) STMO, (e) SLTO, (f) SLTMO2, and (g) SLTMO4.