Oxygen nonstoichiometry and chemical stability of Nd2-xSrxNiO4+δ

Takashi Nakamura; Keiji Yashiro; Kazuhisa Sato; Junichiro Mizusaki

doi:10.1016/j.jssc.2009.03.021

Oxygen nonstoichiometry and chemical stability of Nd_2-xSr_xNiO_4+δ

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

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

23 Citations (Scopus)

Abstract

Nonstoichiometric variation of oxygen content in Nd_2-xSr_xNiO_4+δ (x=0, 0.2, 0.4) and decomposition P(O₂) were determined by means of high temperature gravimetry and coulometric titration. The measurements were carried out in the temperature range from 873 to 1173 K and the P(O₂) range from 10^-20 to 1 bar. Nd_2-xSr_xNiO_4+δ shows the oxygen excess and the oxygen deficient composition depending on P(O₂), temperature, and the Sr content. To evaluate the characteristics of oxygen nonstoichiometric behavior, partial molar enthalpy of oxygen was calculated. The value of partial molar enthalpy of oxygen slightly approaches zero as δ increases in the oxygen excess region while that is independent of δ in the oxygen deficient region. Discussion was made by comparing data of this study with nonstoichiometric and thermodynamic data of La_2-xSr_xNiO_4+δ: Nd_2-xSr_xNiO_4+δ show more oxygen excess than La_2-xSr_xNiO_4+δ in the higher P(O₂) region, while the nonstoichiometric behavior in the oxygen deficient composition is almost the same. The variation of partial molar enthalpy of oxygen with δ for Nd_2-xSr_xNiO_4+δ in the oxygen excess region is much smaller than that of La_2-xSr_xNiO_4+δ. The oxygen nonstoichiometric behavior of Nd_2-xSr_xNiO_4+δ is more ideal-solution-like than that of La_2-xSr_xNiO_4+δ.

Original language	English
Pages (from-to)	1533-1537
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	182
Issue number	6
DOIs	https://doi.org/10.1016/j.jssc.2009.03.021
Publication status	Published - 2009 Jun

Keywords

KNiF type oxides
Layered perovskite
NdNiO
Neodymium nickelate
Oxygen nonstoichiometry

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1016/j.jssc.2009.03.021

Cite this

@article{66951ea5d17c4a289169cea2ac48d785,

title = "Oxygen nonstoichiometry and chemical stability of Nd2-xSrxNiO4+δ",

abstract = "Nonstoichiometric variation of oxygen content in Nd2-xSrxNiO4+δ (x=0, 0.2, 0.4) and decomposition P(O2) were determined by means of high temperature gravimetry and coulometric titration. The measurements were carried out in the temperature range from 873 to 1173 K and the P(O2) range from 10-20 to 1 bar. Nd2-xSrxNiO4+δ shows the oxygen excess and the oxygen deficient composition depending on P(O2), temperature, and the Sr content. To evaluate the characteristics of oxygen nonstoichiometric behavior, partial molar enthalpy of oxygen was calculated. The value of partial molar enthalpy of oxygen slightly approaches zero as δ increases in the oxygen excess region while that is independent of δ in the oxygen deficient region. Discussion was made by comparing data of this study with nonstoichiometric and thermodynamic data of La2-xSrxNiO4+δ: Nd2-xSrxNiO4+δ show more oxygen excess than La2-xSrxNiO4+δ in the higher P(O2) region, while the nonstoichiometric behavior in the oxygen deficient composition is almost the same. The variation of partial molar enthalpy of oxygen with δ for Nd2-xSrxNiO4+δ in the oxygen excess region is much smaller than that of La2-xSrxNiO4+δ. The oxygen nonstoichiometric behavior of Nd2-xSrxNiO4+δ is more ideal-solution-like than that of La2-xSrxNiO4+δ.",

keywords = "KNiF type oxides, Layered perovskite, NdNiO, Neodymium nickelate, Oxygen nonstoichiometry",

author = "Takashi Nakamura and Keiji Yashiro and Kazuhisa Sato and Junichiro Mizusaki",

note = "Funding Information: This research was partly supported by the Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439)” and the Grant-in-Aid for JSPS Fellowship by Ministry of Education, Science, and Culture, Sports and Technology.",

year = "2009",

month = jun,

doi = "10.1016/j.jssc.2009.03.021",

language = "English",

volume = "182",

pages = "1533--1537",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "6",

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TY - JOUR

T1 - Oxygen nonstoichiometry and chemical stability of Nd2-xSrxNiO4+δ

AU - Nakamura, Takashi

AU - Yashiro, Keiji

AU - Sato, Kazuhisa

AU - Mizusaki, Junichiro

N1 - Funding Information: This research was partly supported by the Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439)” and the Grant-in-Aid for JSPS Fellowship by Ministry of Education, Science, and Culture, Sports and Technology.

PY - 2009/6

Y1 - 2009/6

N2 - Nonstoichiometric variation of oxygen content in Nd2-xSrxNiO4+δ (x=0, 0.2, 0.4) and decomposition P(O2) were determined by means of high temperature gravimetry and coulometric titration. The measurements were carried out in the temperature range from 873 to 1173 K and the P(O2) range from 10-20 to 1 bar. Nd2-xSrxNiO4+δ shows the oxygen excess and the oxygen deficient composition depending on P(O2), temperature, and the Sr content. To evaluate the characteristics of oxygen nonstoichiometric behavior, partial molar enthalpy of oxygen was calculated. The value of partial molar enthalpy of oxygen slightly approaches zero as δ increases in the oxygen excess region while that is independent of δ in the oxygen deficient region. Discussion was made by comparing data of this study with nonstoichiometric and thermodynamic data of La2-xSrxNiO4+δ: Nd2-xSrxNiO4+δ show more oxygen excess than La2-xSrxNiO4+δ in the higher P(O2) region, while the nonstoichiometric behavior in the oxygen deficient composition is almost the same. The variation of partial molar enthalpy of oxygen with δ for Nd2-xSrxNiO4+δ in the oxygen excess region is much smaller than that of La2-xSrxNiO4+δ. The oxygen nonstoichiometric behavior of Nd2-xSrxNiO4+δ is more ideal-solution-like than that of La2-xSrxNiO4+δ.

AB - Nonstoichiometric variation of oxygen content in Nd2-xSrxNiO4+δ (x=0, 0.2, 0.4) and decomposition P(O2) were determined by means of high temperature gravimetry and coulometric titration. The measurements were carried out in the temperature range from 873 to 1173 K and the P(O2) range from 10-20 to 1 bar. Nd2-xSrxNiO4+δ shows the oxygen excess and the oxygen deficient composition depending on P(O2), temperature, and the Sr content. To evaluate the characteristics of oxygen nonstoichiometric behavior, partial molar enthalpy of oxygen was calculated. The value of partial molar enthalpy of oxygen slightly approaches zero as δ increases in the oxygen excess region while that is independent of δ in the oxygen deficient region. Discussion was made by comparing data of this study with nonstoichiometric and thermodynamic data of La2-xSrxNiO4+δ: Nd2-xSrxNiO4+δ show more oxygen excess than La2-xSrxNiO4+δ in the higher P(O2) region, while the nonstoichiometric behavior in the oxygen deficient composition is almost the same. The variation of partial molar enthalpy of oxygen with δ for Nd2-xSrxNiO4+δ in the oxygen excess region is much smaller than that of La2-xSrxNiO4+δ. The oxygen nonstoichiometric behavior of Nd2-xSrxNiO4+δ is more ideal-solution-like than that of La2-xSrxNiO4+δ.

KW - KNiF type oxides

KW - Layered perovskite

KW - NdNiO

KW - Neodymium nickelate

KW - Oxygen nonstoichiometry

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U2 - 10.1016/j.jssc.2009.03.021

DO - 10.1016/j.jssc.2009.03.021

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