Abstract
ZrP2O7-CeP2O7 solid solutions, Zr1-xCexP2O7; x = 0–0.2 and (Zr0.92Y0.08)1-yCeyP2O7; y = 0–0.1, were prepared by partially replacing Zr4+ with Ce4+ and its effect on the phase composition, sintering behavior, microstructure, and ionic conductivity is analyzed. Ce4+-doped specimens showed improved sintering behavior due to the partial reduction of Ce4+ to Ce3+, as confirmed by X-ray photoelectron spectroscopy (XPS). In unhumidified atmosphere, the electrical conductivity of Zr1-xCexP2O7 increased with increasing cerium content, which can be attributed to the increase in densification and formation of oxygen vacancies due to the partial reduction of Ce4+ to Ce3+. For (Zr0.92Y0.08)1-yCeyP2O7; y = 0–0.1 specimens, the electrical conductivity increased ≥ 4 orders of magnitude during humidification in air (pH2O = 0.12 atm). At 80 °C, specimen (Zr0.92Y0.08)0.9Ce0.1P2O7 (ZYCP10) showed a maximum of 1.72 × 10−2 S cm−1 which decreased sharply at 100 °C. Furthermore, Zr0.92Y0.08P2O7 (ZYP), (Zr0.92Y0.08)0.95Ce0.05P2O7 (ZYCP5), and ZYCP10 specimens humidified at 160 °C showed the maximum conductivity of 1.04 × 10−3, 1.32 × 10−3, and 8.09 × 10−3 S cm−1, respectively, at 190 °C.
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Funding
This research was supported by the financial assistance from the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), New Delhi, under the Ramanujan Fellowship (SB/S2/RJN-120/2014), Mid-Career Researcher Program (2015R1A2A2A01003852) through NRF grant funded by the MEST, Republic of Korea, and by “KIST Institutional Program” from the Korea Institute of Science and Technology.
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Gautam, S.K., Singh, A., Mathur, L. et al. Sintering and electrical behavior of ZrP2O7–CeP2O7 solid solutions Zr1-xCexP2O7; x = 0–0.2 and (Zr0.92Y0.08)1-yCeyP2O7; y = 0–0.1 for application as electrolyte in intermediate temperature fuel cells. Ionics 25, 155–162 (2019). https://doi.org/10.1007/s11581-018-2563-x
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DOI: https://doi.org/10.1007/s11581-018-2563-x