Effect of sintering temperature on the microstructure, electrical and magnetic properties of Zn0.98 Mn0.02O material

摘要

Zn_(0.98)Mn_(0.02)O material was synthesized from ZnO and MnO2 powders using solid state reaction method. The microstructure, electrical and magnetic properties of Zn_(0.98)Mn_(0.02)O were studied as a function of sintering temperature. The X-ray diffraction analysis indicates that the main phase of synthesized sample is composed of hexagonal wurtzite ZnO phase. While the secondary phase of ZnMnO3 were found at the sintering temperature of 700°C and 900°C. The electrical properties measurement of Zn_(0.98)Mn_(0.02)O sample revealed that the resistivity and the dielectric constant of samples increase with the increase of sintering temperature. The ferromagnetic properties at room temperature were observed in the Zn_(0.98)Mn_(0.02)O samples sintered at 500°C and 700°C. It also found that the increase in sintering temperature leads to a tendency toward the changes in the magnetic properties into paramagnetic. The presence of ZnMnO3 secondary phases in Zn_(0.98)Mn_(0.02)O system is believed to be a factor that affects the decrease of the electrical and magnetic properties of the sample.