Dielectric relaxation in CoFe2−xYxO4 (x = 0.2, 0.4, 0.6) prepared by hydrothermal method

Effect of Frequency and Temperature on Dielectric and Transport Properties of CaO stabilized ZrO2@mullite composites

“…[34] The remarkable increase in dielectric loss at high temperatures (>200°C) and low frequency can be attributed to the Maxwell-Wagner polarization phenomenon observed near the grain boundaries of these composites. [35] The formation of oxygen vacancies or defect species at high temperatures increases the conduction in these composites, causing high energy loss. The increase in ϵ r and tan𝛿 values of these ceramics with temperature rise also symbolizes the increase in ionic conduction due to the thermal activation of Ca 2+ , Al 3+ , Si 4+ , and Zr 4+ cations.…”