Interpretation Of Ferromagnetic Fe Doped Zno By Mossbauer Spectroscopy

Single phase Zn0.95Fe0.05O sample was obtained by the sol-gel method with annealing at 650 degrees C for 6 h in H-2 5%/Ar balance gas atmosphere. The crystalline structure of Zn0.95Fe0.05O is determined to be a P6(3)mc hexagonal structure with lattice constants a(0)=3.255 A and c(0)=5.207 A at room temperature. The Mossbauer spectra were obtained at various temperatures ranging from 4.2 to 295 K. The values of the isomer shifts (delta) show that for all temperature ranges, they are in the ferrous (Fe2+) state. The magnetic hyperfine field (H-hf) and electric quadrupole splitting (Delta E-Q) in the weak ferromagnetic state at 4.2 K have been analyzed, yielding the following results: H-hf=37.8 kOe, theta=67.5 degrees, phi=0 degrees, eta=0.75, Delta E-Q=2.06 mm/s, and R=7.4, respectively. From the Mossbauer spectrum at 77 K, the paramagnetic quadrupole phase is related to the temperature dependence of spin-lattice relaxation. (c) 2007 American Institute of Physics.