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http://hdl.handle.net/10397/95877
Title: | Colossal permittivity in TiO2 co-doped by donor Nb and isovalent Zr | Authors: | Yang, C Wei, X Hao, J |
Issue Date: | Jan-2018 | Source: | Journal of the American Ceramic Society, Jan. 2018, v. 101, no. 1, p. 307-315 | Abstract: | Effect of isovalent Zr dopant on the colossal permittivity (CP) properties was investigated in (Zr + Nb) co-doped rutile TiO2 ceramics, i.e., Nb0.5%ZrxTi1−xO2. Compared with those of single Nb-doped TiO2, the CP properties of co-doped samples showed better frequency-stability with lower dielectric losses. Especially, a CP up to 6.4 × 104 and a relatively low dielectric loss (0.029) of x = 2% sample were obtained at 1 kHz and room temperature. Moreover, both dielectric permittivity and loss were nearly independent of direct current bias, and measuring temperature from room temperature to around 100°C. Based on X-ray photoelectron spectroscopy, the formation of oxygen vacancies was suppressed due to the incorporation of Zrions. Furthermore, it induced the enhancement of the conduction activation energy according to the impedance spectroscopy. The results will provide a new routine to achieve a low dielectric loss in the CP materials. | Keywords: | Colossal permittivity Doped TiO2 Impedance spectroscopy XPS |
Publisher: | Wiley-Blackwell | Journal: | Journal of the American Ceramic Society | ISSN: | 0002-7820 | EISSN: | 1551-2916 | DOI: | 10.1111/jace.15196 | Rights: | © 2017 The American Ceramic Society This is the peer reviewed version of the following article: Yang, C., Wei, X., & Hao, J. (2018). Colossal permittivity in TiO2 co‐doped by donor Nb and isovalent Zr. Journal of the American Ceramic Society, 101(1), 307-315, which has been published in final form at https://doi.org/10.1111/jace.15196. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
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Hao_Colossal_Permittivity_Tio2Co-Doped.pdf | Pre-Published version | 2.47 MB | Adobe PDF | View/Open |
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