Synthesis of Sr substituted BaTiO₃ nanoparticles by hydrothermal treatments with maintaining the source material form and particle size

Abstract

Ion exchange of Ba to Sr was carried out for spherical BaTiO₃ particles (particle size of 600 to 700 nm) by hydrothermal method using strontium nitrate aqueous solution, and the hydrothermal conditions were at 200 °C for 0.5 to 1.5 mol/L for 24 h. After hydrothermal treatment, all samples remained the form and particle size of the source materials. The Sr substituted BaTiO₃ sample obtained by hydrothermal treatment with strontium nitrate at 1.5 mol/L showed the composition of Sr_0.14Ba_0.86TiO₃ by elemental analysis by EDX, and the Curie temperature was confirmed to be 90 °C by Raman spectra, respectively.