Studies on defect structures of (La,Sr)2NiO4 by using X-ray absorption spectroscopy

Toshiaki Ina, Yuki Orikasa, Tomokazu Fukutsuka, Koji Amezawa, Tatsuya Kawada, Yoshiharu Uchimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ni K-edge X-ray absorption spectroscopy was applied to investigate the electronic and defect structures of La2-xSrxNiO 4±δ (x = 0-1.0) annealed under various oxygen partial pressures. X-ray absorption near edge structure (XANES) indicated that the mean valence of Ni ions increased by increasing Sr contents and oxygen partial pressure, accompanied by variation of oxygen nonstoichiometry, in the composition range having excess oxygens and oxygen vacancies. Ni L-edge XANES of La2-xSrxNiO4±δ were used to decide the valence state and the spin state of Ni ions. By increasing Sr contents and oxygen partial pressure, it was found that Ni(II) ions decreased and the low spin state of Ni(III) ions increased.

Original languageEnglish
Title of host publicationECS Transactions - Ionic and Mixed Conducting Ceramics 6 - 213th ECS Meeting
Pages195-200
Number of pages6
Edition26
DOIs
Publication statusPublished - 2008 Dec 1
EventIonic and Mixed Conducting Ceramics 6 - 213th ECS Meeting - Phoenix, AZ, United States
Duration: 2008 May 182008 May 23

Publication series

NameECS Transactions
Number26
Volume13
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherIonic and Mixed Conducting Ceramics 6 - 213th ECS Meeting
CountryUnited States
CityPhoenix, AZ
Period08/5/1808/5/23

ASJC Scopus subject areas

  • Engineering(all)

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    Ina, T., Orikasa, Y., Fukutsuka, T., Amezawa, K., Kawada, T., & Uchimoto, Y. (2008). Studies on defect structures of (La,Sr)2NiO4 by using X-ray absorption spectroscopy. In ECS Transactions - Ionic and Mixed Conducting Ceramics 6 - 213th ECS Meeting (26 ed., pp. 195-200). (ECS Transactions; Vol. 13, No. 26). https://doi.org/10.1149/1.3050391