A novel high-entropy perovskite, Ba (Ti₀. ₂Zr₀. ₂Hf₀. ₂Sn₀. ₂Ce₀. ₂) O₃, was successfully synthesized through a conventional solid-state reaction route and finally sintered at 1350°C for 12 h. Powder X-ray diffraction and Rietveld refinement confirmed the formation of a single-phase cubic structure with space group Pm 3m. Scanning electron microscopy coupled with EDX mapping revealed an uniform microstructure and homogeneous elemental distribution. The electrical properties were investigated using impedance spectroscopy over a temperature range of 35 to 495°C and a frequency range of 100Hz to 1MHz. The real part of impedance decreased with increasing temperature, indicating negative temperature coefficient of resistance (NTCR) behaviour. The imaginary impedance and electrical modulus spectra exhibited temperature-dependent relaxation with peak shifting toward higher frequencies, confirming thermally activated charge transport. The Nyquist plot analysis revealed separate contributions from grains and grain boundaries, demonstrating mixed bulk and interfacial conduction mechanisms. These results establish Ba (Ti₀. ₂Zr₀. ₂Hf₀. ₂Sn₀. ₂Ce₀. ₂) O₃ as a promising candidate for high-temperature electronic and sensing applications.
Kumar et al. (Thu,) studied this question.