{"title":"X-Ray Photoelectron Spectroscopy of Bi2Ni1/2Co1/2Ta2O9±δ Ceramic Oxide","authors":"K. N. Parshukova, S. V. Nekipelov, N. A. Zhuk","doi":"10.1007/s10717-025-00731-3","DOIUrl":null,"url":null,"abstract":"<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>","PeriodicalId":579,"journal":{"name":"Glass and Ceramics","volume":"81 11-12","pages":"487 - 492"},"PeriodicalIF":0.6000,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Glass and Ceramics","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10717-025-00731-3","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
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.
期刊介绍：
Glass and Ceramics reports on advances in basic and applied research and plant production techniques in glass and ceramics. The journal''s broad coverage includes developments in the areas of silicate chemistry, mineralogy and metallurgy, crystal chemistry, solid state reactions, raw materials, phase equilibria, reaction kinetics, physicochemical analysis, physics of dielectrics, and refractories, among others.
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