Influence of processing route on electrical properties of Bi4Ti3O12 ceramics obtained by tape-casting technology

Abstract

A B S T R A C TBismuth titanate powders (Bi 4 Ti 3 O 12 -BIT) were fabricated by solid state reaction (SSR) and polymeric precursor method (PPM). From these powders, Bi 4 Ti 3 O 12 pellets were obtained by tape-casting using plate-like templates particles prepared by a molten salt method. The BIT phase crystallizes in an orthorhombic structure type with space group Fmmm. Agglomeration of the particles, which affects the densification of the ceramic, electrical conduction and leakage current at high electric fields, was monitored by transmission electronic microscopy (TEM) analyses. FEG-SEM indicated that different shape of grains of BIT ceramics was influenced by the processing route. Both SSR and PPM methods lead to unsaturated P-E loops of BIT ceramics originating from the highly c-axis orientation and high conductivity which was affected by charge carriers flowing normally to the grain boundary of the crystal lattice.

Stoichiometric control in Bi4Ti3O12 synthesis by novel hybrid solid state reaction

“…Finally the pattern recorded 850 °C exhibits a well-defined BiT crystalline structure. Diffraction peaks observed on this pattern were indexed on according to literature [18]. Moreover no signal from the Bi2O3 crystalline phase can be detected.…”