ABSTRACT Bismuth titanate‐ferrite (Bi 5 Ti 3 FeO 15 ), as a promising high‐temperature piezoelectric ceramic, has disadvantages such as its poor piezoelectric constant ( d 33 = 7.1 pC/N) and low electrical resistivity at high temperature, which limit its practical applications in high‐temperature environments, in spite of its high Curie temperature ( T C = 761°C). In this study, we have prepared textured Bi 5 Ti 3 FeO 15 ceramics with up to 87.8% Lotgering factor ( f ) using a two‐step spark plasma sintering (SPS) technique. The textured Bi 5 Ti 3 FeO 15 ceramics exhibit superior piezoelectric properties, achieving a d 33 value of 29.7 pC/N, a fourfold increase over non‐textured counterparts. While maintaining a high T C of 772°C, these ceramics also demonstrate significant high‐temperature direct–current electrical resistivity ( ρ = 3.21×10 5 Ω cm at 500°C). These findings overcome the traditional drawbacks of Bi 5 Ti 3 FeO 15 , specifically its modest piezoelectricity and resistivity. The resulting textured ceramics, prepared through two‐step spark plasma sintering, exhibit the necessary properties for high‐performance use in high‐temperature piezoelectric devices.
Yu et al. (2026) studied this question.