期刊
CERAMICS INTERNATIONAL
卷 37, 期 7, 页码 2423-2427出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2011.05.093
关键词
X-ray method; Dielectric properties; Spark plasma sintering; Charge ordering
资金
- National Science Foundation of China [50702049, 50832005]
- Fundamental Research Funds for Central Universities [2010QNA4006]
The crystal structure and dielectric properties of Nd2NiO4+delta ceramics prepared by spark plasma sintering (SPS) process were characterized. The crystal structure belonged to orthorhombic system with a space group of F mmm, and the excess oxygen content, delta, was about 0.192. Temperature-stable giant dielectric constants (epsilon' similar to 10(5)) up to high frequency (5 MHz) over a wide temperature range (200-500 K) were observed in the present ceramics. After comparing the activation energies of dielectric relaxation and electrical conduction, we found the giant dielectric response should be mainly attributed to the adiabatic small polaronic hopping process, while the polaronic hopping process was closely related to the charge ordering in the present ceramics. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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