Tailoring the optical phonon modes and dielectric properties of nanocrystalline SrTiO₃via Yb doping

Effect of rare-earth (RE) ionic radius on the dielectric properties of Sr99%RE1%TiO3 (RE = La, Nd, Yb) single crystals

“…This indicates that the substitution of Yb 3+ for Ti 4+ occurs in Yb-STO. This phenomenon has been previously reported 49,50 due to the fact that the ionic radius of Yb 3+ (0.868 Å) is smaller than that of Sr 2+ (1.44 Å) but larger than that of Ti 4+ (0.605 Å) and closer to Ti 4+ . Fig.…”