Zn1-xCoxO diluted magnetic semiconductor bulks were prepared by hot pressing .Mixed powders of pure ZnO and CoO were compacted under pressure of 10 MPa at the temperature of1 073 K .Then the samples were annealed in vacuum at the temperature from 673 K to 873 K for 10 h .The crystal structure and magnetic properties of Zn1-xCoxO bulks have been investigated by X-ray diffraction(XRD)and vibrating sample magnetometer(VSM) .X-ray phetoelectron spectroscopy(XPS)was used to study chemical valence of zinc and cobalt in the samples,The results showed that Zn1-xCoxO samples had c-axis oriented wurtzite symmetry,neither cobalt or cobalt oxide phase was found in the samples if x was less than 0 .15 .Zn and Co existed in Zn0 .9Co0,10 sample in Zn2+and Co2+states .The results of VSM experiment proved the room temperature ferromagnetic properties(RTFP)of Co-doped ZnO samples .The saturation magnetization and the coercivity of Zn0 .gCo0 .10 sample,observed in the M-H curve,were about 0 .20 emu/g and 200 Oe,respectively .
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