Quantum-confinement effects on the optical and dielectric proerties for mesocrystals of BaTiO(sub)3 and SrBi(sub)2 Ta(sub)2O(sub)9

Results indicate that BaTiO(sub)3 mesocrystals show a blueshift in the optical band gap whereas SrBi(sub)2 Ta(sub)2O(sub)9 mesocrystals exhibit increase in the optical band gap consequent of their reduced size. Data further show that both crystals show a decrease in the dielectric constant temperature.