Oxygen nonstoichiometry and electrical properties of La2–xSr xNiO4+δ (0 ≤ x ≤ 0.5)

Dang Hoang Hop; Roy Byung Kyu Chung; Young Woo Heo; Jeong Joo Kim; Joon Hyung Lee

doi:10.1007/s43207-020-00049-6

Oxygen nonstoichiometry and electrical properties of La_2–xSr_xNiO_4+δ (0 ≤ x ≤ 0.5)

Dang Hoang Hop, Roy Byung Kyu Chung, Young Woo Heo, Jeong Joo Kim, Joon Hyung Lee

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The amount of interstitial oxygen (δ) in Sr-doped lanthanum nickel oxide (La_2–xSr_xNiO_4+δ) as a function of Sr content has been investigated by the thermogravimetry analysis (TGA) and X-ray photoelectron spectroscopy (XPS). La_2–xSr_xNiO_4+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 La_2–xSr_xNiO_4+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.

Original language	English
Pages (from-to)	416-422
Number of pages	7
Journal	Journal of the Korean Ceramic Society
Volume	57
Issue number	4
DOIs	https://doi.org/10.1007/s43207-020-00049-6
State	Published - 1 Jul 2020

Keywords

Electrical properties
Hole concentration
Oxygen nonstoichiometry
p-type
Sintering

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title = "Oxygen nonstoichiometry and electrical properties of La2–xSr xNiO4+δ (0 ≤ x ≤ 0.5)",

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.",

keywords = "Electrical properties, Hole concentration, Oxygen nonstoichiometry, p-type, Sintering",

author = "Hop, {Dang Hoang} and Chung, {Roy Byung Kyu} and Heo, {Young Woo} and Kim, {Jeong Joo} and Lee, {Joon Hyung}",

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T1 - Oxygen nonstoichiometry and electrical properties of La2–xSr xNiO4+δ (0 ≤ x ≤ 0.5)

AU - Hop, Dang Hoang

AU - Chung, Roy Byung Kyu

AU - Heo, Young Woo

AU - Kim, Jeong Joo

AU - Lee, Joon Hyung

PY - 2020/7/1

Y1 - 2020/7/1

N2 - 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.

AB - 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.

KW - Electrical properties

KW - Hole concentration

KW - Oxygen nonstoichiometry

KW - p-type

KW - Sintering

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DO - 10.1007/s43207-020-00049-6

M3 - Article

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SN - 1229-7801

VL - 57

SP - 416

EP - 422

JO - Journal of the Korean Ceramic Society

JF - Journal of the Korean Ceramic Society

IS - 4

ER -

Oxygen nonstoichiometry and electrical properties of La_2–xSr_xNiO_4+δ (0 ≤ x ≤ 0.5)

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Keywords

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