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J. Korean Ceram. Soc. > Volume 57(4); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(4): 416-422.
doi: https://doi.org/10.1007/s43207-020-00049-6
Oxygen nonstoichiometry and electrical properties of La2–xSrxNiO4+δ (0 ≤ x ≤ 0.5)
Dang‑Hoang Hop2, Roy Byung Kyu Chung1, Young‑Woo Heo1, Jeong‑Joo Kim1, Joon‑Hyung Lee1
1School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Korea
2Ministry of Science and Technology of Vietnam, 113 Tran Duy Hung Street, Cau Giay District, Hanoi, Vietnam
Correspondence  Joon‑Hyung Lee ,Email: joonlee@knu.ac.kr
Received: January 13, 2020; Revised: February 7, 2020   Accepted: March 12, 2020.  Published online: April 30, 2020.
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.
Key words: Electrical properties · Sintering · Oxygen nonstoichiometry · p-type · Hole concentration
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