期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1065, 期 -, 页码 199-204出版社
ELSEVIER
DOI: 10.1016/j.molstruc.2014.02.056
关键词
ZnO nanostructures; Surface defects; Grain size; Impedance spectroscopy; Ferromagnetic
Nanostructure of Zn1-xCrxO (x = 0.0, 0.05 and 0.1) were synthesized successfully through sal-gel route. The effects of grain size and grain boundary defects on the electrical and magnetic properties have been investigated. X-ray diffraction (XRD) and selected area electron diffraction (SAED) results reveal the single-phase character. Crystallite sizes were obtained from the XRD patterns whose values are decreasing from similar to 27 to similar to 16 nm with increase in Cr content from 0% to 10% respectively. X-ray photoelectron spectroscopy (XPS) confirms the incorporation of Cr3+/Cr2+ ions in the lattice structure of ZnO, which causes decreasing in the valence electron density of Zn. Dielectric constant (epsilon) has been explained in the light of Maxwell-Wagner interfacial model, which differentiates between the structure of grain-core and grain-boundary. Complex impedance spectroscopy has been used to separate the grain and grain boundary contributions, the high resistivity values (10(7) Omega) can be attributed to the dominance of grain boundary resistance. The samples exhibit room temperature ferromagnetic (RT-FM) behavior, which has been discussed based on BMP model and effect of grain/grain boundary structure. (C) 2014 Elsevier B.V. All rights reserved.
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