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<p>A cubic pyrochlore with the composition Bi<sub>2</sub>Ni<sub>1/2</sub>Co<sub>1/2</sub>Ta<sub>2</sub>O<sub>9±δ</sub> (sp. gr. <i>Fd–3m</i>, <i>a</i> = 10.5261(8) Å) was synthesized from the corresponding oxides by the solid phase reaction method for the first time. The complex oxide is characterized by a porous microstructure formed by partially fused crystallites of elongated shape with an average longitudinal size of 1 – 2 μm. The chemical state of the transition element cations in pyrochlore was characterized by x-ray photoelectron spectroscopy (XPS) and x-ray absorption near edge structure (NEXAFS). A characteristic shift of the Ta4f spectrum by 0.8 eV into the low energy region is observed for the pyrochlore. The charge state of the tantalum cations corresponds to a value of +(5 – δ). The absorption spectrum of pyrochlore near the Co2p absorption edge is a superposition of the CoO and Co<sub>3</sub>O<sub>4</sub> spectra. According to the nature of the XPS, and NEXAFS Ni2p spectra the nickel ions are in the Ni(II, III) state.</p>

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X-Ray Photoelectron Spectroscopy of Bi2Ni1/2Co1/2Ta2O9±δ Ceramic Oxide

  • 期刊论文

  • 发表日期：

    2025年3月29日

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  • K. N. Parshukova,
  • S. V. Nekipelov,
  • N. A. Zhuk

摘要

A cubic pyrochlore with the composition Bi2Ni1/2Co1/2Ta2O9±δ (sp. gr. Fd–3m, a = 10.5261(8) Å) was synthesized from the corresponding oxides by the solid phase reaction method for the first time. The complex oxide is characterized by a porous microstructure formed by partially fused crystallites of elongated shape with an average longitudinal size of 1 – 2 μm. The chemical state of the transition element cations in pyrochlore was characterized by x-ray photoelectron spectroscopy (XPS) and x-ray absorption near edge structure (NEXAFS). A characteristic shift of the Ta4f spectrum by 0.8 eV into the low energy region is observed for the pyrochlore. The charge state of the tantalum cations corresponds to a value of +(5 – δ). The absorption spectrum of pyrochlore near the Co2p absorption edge is a superposition of the CoO and Co3O4 spectra. According to the nature of the XPS, and NEXAFS Ni2p spectra the nickel ions are in the Ni(II, III) state.