Abstract
The amount of interstitial oxygen (δ) in Sr-doped lanthanum nickel oxide (La2–xSrxNiO4+δ) as a function of Sr content has been investigated by the thermogravimetry analysis (TGA) and X-ray photoelectron spectroscopy (XPS). La2–xSrxNiO4+δ (0 ≤ x ≤ 0.5) ceramics were prepared by the general solid-state reaction process and sintered in different ambient of argon, air or oxygen, respectively. An increase in the amount of Sr decreased δ in La2–xSrxNiO4+δ, while the Ni2+/Ni3+ ratio analyzed by Ni3p XPS decreased indicating that the oxidation state of Ni increased. Particularly when the sample was sintered in a low oxygen partial pressure condition such as in Ar ambient, the hole concentration strongly depended on the Sr content, suggesting that the hole generation seems mostly originated from Sr2+ substitution into the La3+ site.
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Acknowledgements
This work was supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (2017R1D1A1B03035336). Roy Byung Kyu Chung was partially supported by the National Research Foundation (NRF) of Korea grant funded by the Korean Government (MSIT) (NRF-2019R1G1A1100204).
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Hop, DH., Chung, R.B.K., Heo, YW. et al. Oxygen nonstoichiometry and electrical properties of La2–xSrxNiO4+δ (0 ≤ x ≤ 0.5). J. Korean Ceram. Soc. 57, 416–422 (2020). https://doi.org/10.1007/s43207-020-00049-6
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DOI: https://doi.org/10.1007/s43207-020-00049-6