کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1803620 | 1024622 | 2009 | 4 صفحه PDF | دانلود رایگان |
Single-phase Zn1−xCoxO (x=0.02, 0.04) powders were synthesized by a simple co-precipitation technique. X-ray diffraction analysis reveals that the Co-doped ZnO crystallizes in a wurtzite structure. The lattice constants of Co-doped ZnO powders decrease slightly when Co is doped into ZnO. Optical absorption spectra show a decrease in the bandgap with increasing Co content and also give an evidence of the presence of Co2+ ions in tetrahedral sites. Raman spectra indicate that Co doping increased the lattice defects and induced another Raman vibration mode around at 538 cm−1, which is an indicator for the incorporation of Co2+ ions into the ZnO host matrix. Magnetic measurement reveals that the Zn1−xCoxO (x=0.02, 0.04) powders clearly exhibit room-temperature ferromagnetic behavior, which makes them potentially useful as building components for spintronics.
Journal: Journal of Magnetism and Magnetic Materials - Volume 321, Issue 14, July 2009, Pages 2216–2219