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Title: | Disappearance and recovery of colossal permittivity in (Nb+Mn) co-doped TiO2 | Authors: | Yang, C Wei, X Hao, J |
Issue Date: | 1-Aug-2018 | Source: | Ceramics international, 1 Aug. 2018, v. 44, no. 11, p. 12395-12400 | Abstract: | We investigate the effects of doping and annealing on the dielectric properties of metal ions doped TiO2 ceramics. Colossal permittivity (CP) above 104 was observed in single Nb ion doped TiO2, which was dominated by electron transport related interfacial polarization. Moreover, the CP can be dropped to 120 when simultaneously introducing Mn ion into the sample. The disappearance of CP behaviors maybe due to the multivalence of Mn which would inhibit the reduction of Ti4+ to Ti3+, and thus reduce delocalized electrons. Interestingly, the CP was recovered for the (Nb+Mn) co-doped TiO2 after post-sintering heat treatment in N2 atmosphere. The recovery of CP in the sample after annealing can be ascribed to the semiconducting grain and the insulating grain boundary, according to impedance spectroscopy. We therefore believe that this work can help us understand the mechanism of CP from a new perspective. | Keywords: | Annealing Colossal permittivity Impedance spectroscopy Mn-doped TiO2 XPS |
Publisher: | Pergamon Press | Journal: | Ceramics international | ISSN: | 0272-8842 | EISSN: | 1873-3956 | DOI: | 10.1016/j.ceramint.2018.04.028 | Rights: | © 2018 Elsevier Ltd and Techna Group S.r.l. All rights reserved. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Yang, C., Wei, X., & Hao, J. (2018). Disappearance and recovery of colossal permittivity in (Nb+ Mn) co-doped TiO2. Ceramics International, 44(11), 12395-12400 is available at https://doi.org/10.1016/j.ceramint.2018.04.028 |
Appears in Collections: | Journal/Magazine Article |
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