Abstract:Barium strontium titanate (Ba_1−xSr_xTiO₃, BST) and strontium barium niobate (Sr_xBa_1−xNb₂O₆, SBN) are important ferroelectric materials with excellent pyroelectric, dielectric properties and faster response time of infrared radiation. SBN/BST composite ceramics with different mole ratios of Nb and Ti were fabricated using a powder-sol (P-S) method with Nb₂O₅ fine powders suspended in the barium strontium titanate (BST in short) sol solution. The X-ray diffraction results indicate that three intermediate phases, i.e. TiO₂, BaNb₂O₆ and SrNb₂O₆, are developed during the formation of SBN-BST. Powders obtained from dried gels are calcined at 800 ℃ for 3 h. The Ti_2p spectra of only one spin-orbit doublet are observed, which indicates one 4+ chemical state in the composite ceramics. The binding energies of Nb element depend strongly on composition.

Key words: barium strontium titanate; strontium barium niobate; binding energy