期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 181, 期 8, 页码 2073-2077出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2008.04.012
关键词
Nio nanocrystals; low temperature conductivity; dielectric
资金
- NSFC [20671092, 20773132, 20771101]
- National Basic Research Program of China [2007CB613301]
- Directional Program of CAS [KJCXZ-YW-M05]
- Research Foundation of FJIRSM [SZD08002-3]
Low-temperatures impedance and dielectric properties of NiO nanocrystals as a function of particle size were investigated by alternative current impedance spectra. It is found that NiO nanocrystals showed distinct bulk and grain boundary conductions at low temperatures, which were almost the same within the experimental error during the decreasing and the subsequent increasing temperature processes. This result indicated that no further protons are formed dui in these temperature cycles. The conductivities are also highly dependent on the particle size. As the particle size reduced, the conductivities of NiO nanocrystals increased to show a maximum. Further particle size reduction less than 8.9 nm led to a sudden decrease in conductivity. The corresponding activation energies showed a minimum with varying the particle size. These observations were most likely clue to the balance between the concentration of charge carriers, holes and protons. (C) 2008 Elsevier Inc. All rights reserved.
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