Impact of Li doping on the microstructure, defects, and physical properties of CuFeO2 multiferroic ceramics

摘要: Abstract An investigation on the microstructure, defects, and physical properties for Cu1-xLixFeO2 (x = 0.00–0.08) ceramic samples is here presented. The delafossite structure with R 3 ‾ m space group all retrieved using Powder X, whereas grain growth can be effectively inhibited by Li doping. Positron annihilation results demonstrate that vacancies are formed in specimens, defect size concentration affected Electric measurements show prepared exhibit giant dielectric behavior, while undoped CuFeO2 sample exhibits maximum value around 3.5 × 104. internal barrier capacitance model (IBLC) used to systematically explain mechanism of system. Optical analysis shows an obvious absorption peak occurs at 225 nm, a decrease direct optical band gap increase doping content observed. Magnetic reveal antiferromagnetic transition temperature has almost no change content, co-existence ferromagnetism antiferromagnetism magnetization increases amount, which x = 0.08 (about 24 emu/g). evolution magnetic seen related lattice distortion, vacancy defect, disturbance spin induced