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Influence of Sc concentration on transport properties of CaHf1-xScxO3-α

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Abstract

In this work, a series of CaHf1-xScxO3-α (x = 0, 0.10, 0.15, 0.20, and 0.30) perovskite oxides have been prepared by a solid-state reaction. The crystal structure and lattice parameters of the orthogonally-distorted perovskite phases of CaHf1-xScxO3-α were obtained. The results revealed that Sc-doping could significantly improve the conductivity and proton transport properties of CaHfO3. However, at x > 0.2, the conductivity decreased with increase in Sc concentration. CaHf0.85Sc0.15O3-α exhibited the highest conductivity among all specimens in the temperature range of 400 to 900 °C. The conduction activation energy of CaHfO3 significantly decreased with Sc-doping in the range of 0.66 to 1.52 eV. Overall, the CaHf1-xScxO3-α demonstrated pure proton conduction in the temperature range of 300 to 600 °C under wet 1%H2-Ar, whereas the proton relative transport number decreased with increasing temperature to within the range of 600–900 °C. At an optimal Sc concentration of x = 0.1, CaHf1-xScxO3-α rendered the highest proton transport number.

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Funding

This work was financially supported by the National Natural Science Foundation of China (Project nos. 51704063, 51834004, and 51774076) and the Fundamental Research Funds for the Central Universities (Project no. N172513032).

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  1. Liaoning Key Laboratory for Metallurgical Sensor Materials and Technology, School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Yushi Ding, Ying Li, Shuo Gong, Wenlong Huang & Hao Yan

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  1. Yushi Ding
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Correspondence to Ying Li.

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Ding, Y., Li, Y., Gong, S. et al. Influence of Sc concentration on transport properties of CaHf1-xScxO3-α. Ionics 27, 2097–2106 (2021). https://doi.org/10.1007/s11581-021-03975-5

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