The structural and electrical characteristics of Cu‐doped LiGaCr 4 O 8 ceramics were explored. X‐ray diffraction analysis of the samples indicated changes in the Cr−Cr bond lengths and Cr−O−Cr bond angles. The distorted CrO 6 octahedra caused by doping affected the dielectric and piezoelectric properties. The dielectric properties were explored in detail, and the variations of the permittivity and loss with frequency were accurately measured from 20 Hz to 10 MHz at a range of temperatures. Cu doping enhanced the dielectric constant by approximately one order of magnitude while reducing the dielectric loss by nearly two orders of magnitude. The frequency‐dependent electrical modulus showed non‐Debye type relaxation behavior. Within the temperature measurement range, the samples exhibited both positive temperature coefficient of resistance and negative temperature coefficient of resistance characteristics. The variation in DC resistivity followed the Arrhenius equation. The activation energy of DC resistivity estimated using the Arrhenius equation exhibits a nonlinear trend. As the amount of Cu doping increased, the piezoelectric charge coefficients increased.
Bian et al. (Sun,) studied this question.