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In this paper, hydrothermal method of ZnO crystals were diluted magnetic doping , the method is in Zn (OH) 2 or ZnO precursor mixed with a certain amount of transition metal oxides or chlorides, at higher concentrations of mineralizer conditions , 430 ℃, temperature for 24 hours, synthesis of doped with Mn, Co, Ni, Fe ions ZnO crystal . X- ray spectra and electron probe technique to measure the crystal of the transition metal ion content , may be doped in ZnO confirmed Mn, Co, Fe, Ni ions. Wherein the Mn and Co ions can be doped ZnO crystal higher concentrations , the maximum amount of more than 8% Mn-Doped ( atomic% ), Co more than 5% ( atomic percent ) ; the doped crystal has completely crystalline form appearance , maintained at low concentrations of ZnO hexagonal structure at high concentrations asymmetric structure hexagonal crystals appear . In ZnO of Fe, Ni doping of less, about 0.5%. In increasing the doping amount of the precursors , its content inside a crystal not increased, the doped crystal also has good crystal morphology . The study also found that it is difficult in ZnO doped with Cu, Mg ions. Preliminary study Zn 1-x Mn x O ferromagnetic properties , found in the ferromagnetic below 50K , and the reproducibility of the sample is higher.
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