The magnetic properties of p-type Zn1−xMnxO achieved by co-precipitation technique

In this paper, the magnetic properties of p-type Zn_1-xMn_xO powders are reported. This are prepared from the decomposition of an oxalate precursor Zn_1-xMn_xC₂O₄^.H₂O. The oxalate precursor is obtained by coprecipitation of 50 ml of a 0.4mol/L aqueous solution of Zn and Mn acetates and the same volume of a 0.4 mol/L solution of oxalic acid. The mixed solution is stirred for 2h at room temperature. We added CH₃COONH₄ and In(NO₃)₃^.H₂O as p-type doped source (Zn:N:In=l:3:0.05 mol) to the solution with addition 3h stirring. The precipitate is then washed with distilled water and dried in air. The white powders obtained are then annealed in N₂ at 500-800 K for 2h and finally turned moss yellow powder samples. The structure of the powder samples are studied by X-ray diffraction (XRD). All the observed lines from the XRD patterns show the ZnO structure without any hint of an impurity phase. With the increase of x, the peak position of Zn_1-xMn_xO shifts towards lower angles and the lattice constants a and c increase linearly, which means that the Mn²⁺ replaces well the Zn²⁺ to occupy the 2b crystallographic site.