Low temperature synthesis and characterization of lanthanide-doped BaTiO_3 nanocrystalst

摘要

The vapor diffusion sol-gel (VDSG) method was employed for the room-temperature synthesis of ～10 nm, aliovatently doped 0.4, 0.8, and 1.6 mol% La∶BaTiO_3 and 0.4, 0.6, and 1.2 mol% Dy∶BaTiO_3 nanocrystals. Maximum ensemble relative permittivities of 176 and 208 were observed in the 0.8 mol% La:BaTiO_3 and the 1.2 mol% Dy∶BaTiO_3 nanocrystals, respectively, relative to 89 for undoped BaTiO_3 (at 1 MHz, 25℃) due to local disorder induced by aliovalent substitution.