Preparation and electrical properties of nanoporous BaTiO3

Nanoporous barium titanate with high specific surface area was prepared from co-gel precursors through solvothermal method followed by supercritical drying. The samples were accumulated by BaTiO3 nanoparticles with excellent crystallinity. The BaTiO3 obtained at 60 degrees C exhibited a high BET surface area of 117 m(2)/g. The porosity reduced with the increasing solvothermal temperature. Raman spectra indicated that the solvothermal-synthesized BaTiO3 was composed by both cubic phase and tetragonal phase. The relations between dielectric properties and the porosity of the samples were also investigated. The introduction of pores reduced the dielectric constant obviously. The dielectric constant of the obtained sample increased with the decrease of the porosity. (C) 2010 Elsevier B.V. All rights reserved.