Phase structure-dependent low temperature ionic conductivity of Sm2O3

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Applied Physics Letters, Volume 121, issue 10
Samarium oxide (SMO), a rare-earth oxide, has gathered great interest from researchers because of its variable valences and promising ionic conductivity. Herein, SMOs with cubic and monoclinic phases were synthesized. The changes in the crystal structure of SMOs with sintering temperature were analyzed. The cell based on cubic phase SMO achieves an excellent maximum power density of 0.876 W cm-2 along with a high ionic conductivity at 550 °C, indicating an enhanced ionic conductivity compared with monoclinic phase SMO. Further analysis of x-ray diffraction and x-ray photoelectron spectra results confirmed that there were more oxygen vacancies formed in cubic phase SMO than monoclinic phase SMO, thereby offering more active sites for fast ion transport. Furthermore, both cubic phase and monoclinic phase SMOs are dominated by proton conduction, while cubic phase SMO is further coupled with oxygen ion conduction, which leads to higher ionic conductivity of cubic phase SMO. In this study, the ionic conductivitiesof SMOs with different crystal structures are compared and reasons for the differences are disclosed, which provides guidance for further applications of SMO.
Funding Information: This work was supported by the National Natural Science Foundation of China (NSFC) (Grant No. 22109022), the Fundamental Research Funds for the Central Universities (Grant Nos. 3203002105A2 and 2242022k30063), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. SJCX22_0040). The support of Open Project of Key Laboratory of Artificial Structure and Quantum Control (Ministry of Education), Shanghai Jiao Tong University is also acknowledged. Publisher Copyright: © 2022 Author(s).
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Ma , L , Hu , E , Yousaf , M , Lu , Y , Wang , J , Wang , F & Lund , P 2022 , ' Phase structure-dependent low temperature ionic conductivity of Sm 2 O 3 ' , Applied Physics Letters , vol. 121 , no. 10 , 102104 , pp. 1-7 .