| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Relaxation of Dielectric Loss Peak over Intermediate Temperature Range in Bi5TiNbWO15 Intergrowth |
| WANG Wei, WANG Xiao-Juan, ZHU Jun, MAO Xiang-Yu, CHEN Xiao-Bing |
| College of Physics Science and Technology, Yangzhou University, Yangzhou 225002 |
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| Cite this article: |
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WANG Wei, WANG Xiao-Juan, ZHU Jun et al 2009 Chin. Phys. Lett. 26 047701 |
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Abstract A dielectric loss peak with relaxation-type characteristic is observed in Bi5TiNbWO15 over 200-400°C. The modified Cole-Cole relation by introducing relaxation strength as another important fitting parameter is used to describe this temperature-dependent behaviour of dielectric relaxation process. This peak is considered to be associated with the oxygen vacancies inside the grains and with its activation energy by relaxation determined to be 0.76eV. The obtained broadening factor α is around 0.4, which indicates a strong correlation between those relaxation units. It is confirmed that the behaviour of this peak is due to the combined effects of the dielectric relaxation and electrical conduction by the thermal motion of oxygen vacancies. These results are further confirmed in Bi5TiNbWO15 samples through oxidization atmosphere treatment and Nd modification respectively.
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| Keywords:
77.22.Gm
77.80.Bh
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Received: 26 December 2008
Published: 25 March 2009
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