期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 23, 页码 L208-L212出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.03.119
关键词
Nanostructured materials; Ferroelectrics; Chemical synthesis; Dielectric response; Phase transitions; Optical spectroscopy
资金
- Department of Science and Technology, India [100/IFD/1637]
- DST
Enhancement in the dielectric and ferroelectric properties has been observed in case of Li-doped ZnO nanorods (NR). Effect of Li-doping on ZnO structure and its optical properties has also been reported. In high resolution TEM studies, the length and diameter of as-synthesized Li-ZnO nanorods were found in the range of 100-150 nm and 20-70 nm, respectively. XRD studies, Li-doped ZnO NR exhibited wurzite structure in which lattice parameter becomes larger than the pure ZnO NR. In dielectric studies, higher dielectric constant and a ferroelectric phase transition at 72 degrees C were observed. In ferroelectric studies, high remnant polarization of 0.873 mu C/cm(2) and low coercive field of 0.592 kV/cm were observed, which were better than their values in bulk Li-doped ZnO (0.044 mu C/cm(2) and 2.0 kV/cm, respectively). In UV-Vis spectra, low absorption band edge at 352 nm was observed due to the size effect in the ZnO nanorods. In addition, PL spectra show a blue shift in both UV and visible region as a result of doping. These results are discussed in the light of the nanorods of confined geometry. (C) 2011 Elsevier B.V. All rights reserved.
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