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Nakamura T, Oike R, Ling Y, et al. The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides. Phys Chem Chem Phys. 2015;18(3):1564-9doi: 10.1039/c5cp05993c.
Nakamura, T., Oike, R., Ling, Y., Tamenori, Y., & Amezawa, K. (2016). The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides. Physical chemistry chemical physics : PCCP, 18(3), 1564-9. https://doi.org/10.1039/c5cp05993c
Nakamura, Takashi, et al. "The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides." Physical chemistry chemical physics : PCCP vol. 18,3 (2016): 1564-9. doi: https://doi.org/10.1039/c5cp05993c
Nakamura T, Oike R, Ling Y, Tamenori Y, Amezawa K. The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides. Phys Chem Chem Phys. 2016 Jan 21;18(3):1564-9. doi: 10.1039/c5cp05993c. Epub 2015 Dec 15. PMID: 26671302.
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Phys Chem Chem Phys. 2016 Jan 21;18(3):1564-9. doi: 10.1039/c5cp05993c. Epub 2015 Dec 15.

The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides.

Physical chemistry chemical physics : PCCP

Takashi Nakamura, Ryo Oike, Yihan Ling, Yusuke Tamenori, Koji Amezawa

Affiliations

  1. Institution of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan. [email protected].

PMID: 26671302 DOI: 10.1039/c5cp05993c

Abstract

The interstitial oxygen formation mechanism in La2NiO4-based oxides was studied using soft X-ray absorption spectroscopy. When the interstitial oxygen concentration increased, the pre-edge peak of O K-edge spectra increased while Ni L-edge spectra was almost invariant. These spectral changes strongly suggest the significant contribution of ligand oxygen to interstitial oxygen formation by providing/accepting electronic charge carriers. The variation of the integrated peak intensity of the O K-edge strongly suggests that interstitial oxygen formation is determined by the equilibrium unoccupied pDOS of ligand oxygen. From this hypothesis, we propose that modulating the electronic structure is the key to control the capability of interstitial oxygen formation in La2NiO4-based oxides.

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