Zn1-xMnxO (x = 0.01, 0.02, 0.05, 0.1, and 0.15) powders were
prepared by solid-state reaction processes. The structural and magnetic
properties of the powders were investigated. X-ray diffraction (XRD)
analysis of the samples indicates the presence of wurtzite crystal structure
similar to pure ZnO and absence of any other secondary phase till 5% Mn
doping. This suggests that doped Mn2+ ions substitute Zn2+ sites.
However, Raman results revealed the presence of secondary phase even at very
low Mn doping (2%), which demonstrates that Mn does not incorporate
completely the ZnO lattice. The powders exhibit ferromagnetism at low
temperatures and paramagnetic at room temperature. Transition from
ferromagnetic to paramagnetic is highlighted by measurements at 230 K.