A clear trend of diffraction peaks shifting slightly toward higher angles is observed in Figure 1 for Ba 2 M 0.4 Bi 1.6 O 6 double perovskites with doping ions from La 3+ to Pb 4+ , which is consistent with the results from Matsushita et al.
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Strategic Doping for Precise Structural Control and Intense Photocurrents Under Visible Light in Ba<sub>2</sub>M<sub>0.4</sub>Bi<sub>1.6</sub>O<sub>6</sub> (M = La, Ce, Pr, Pb, Y) Double Perovskites.
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The sentences
This indicates structural stability and possibly a decreasing trend in structural distortion from M = La to M = Y [ 34 , 38 , 39 ].