Effect of annealing on structural, dielectric, transport and magnetic properties of (Zn, Co) co-doped SnO2 nanoparticles
文摘
After our first study of dielectric and magnetic properties in the (Zn, Co) co-doped SnO2 nanoparticles annealed at 600 °C, we present a comprehensive investigation of the structural, dielectric, transport and magnetic properties of chemically prepared pure and (Zn, Co) co-doped SnO2 nanoparticles annealed at 800 °C, using X-ray diffraction, transmission electron microscopy (TEM), L.C.R meter and magnetic properties measurement system (MPMS related SQUID). In all (Zn, Co) co-doped SnO2 samples prepared at 800 °C with Co content x ≤ 0.05, the SnO2 lattice contracts, dielectric constant and dielectric loss decreases whereas the electrical conductivity increases more than that of the 600 °C annealed samples. Room temperature ferromagnetic behavior observed in (Zn, Co) co-doped SnO2 samples. Increasing the Co content x to 0.03 leads to an increasing the ferromagnetic behavior, afterward the ferromagnetic behavior is observed to be decreases. A comparative study shows that (Zn, Co) co-doped SnO2 nanoparticles annealed at 800 °C have an excellent dielectric, magnetic properties and high electrical conductivity than that of the 600 °C annealed data, thus, they can be used as high frequency devices, ultrahigh dielectric materials and spintronics.