Crystallographic Evolution, Dielectric, and Piezoelectric Properties of Bi 4 Ti 3 O 12 :W/Cr Ceramics

W/Cr codoped Bi 4 Ti 3 O 12 ceramics, Bi 4 Ti 3− x W x O 12+ x +0.2 wt%Cr 2 O 3 (BITWC, x =0–0.15), were prepared using a solid‐state reaction method. The crystallographic evolution and phase analysis were distinctly determined focusing on the X‐ray diffraction peak changes in (020)/(200) and (220)/(1115) diffraction planes, by which the lattice parameters, a, b , and c can be refined. The thermal variations of permittivity, dielectric loss (tan δ), impedance, and electrical conductivity properties were characterized. A decrease in the values of Curie temperature from 675° to 640°C and an increase in the values of the dielectric constant due to an increase of W 6+ /Cr 3+ content were observed. The highest piezoelectric constant, d 33 of 22 pC/N, was achieved with the composition of Bi 4 Ti 2.975 W 0.025 O 12.025 +0.2 wt% Cr 2 O 3 . Also, this composition had a lower electrical conductivity than the other investigated compositions.