Chemical bonding in the Bi_{1鈭?span style='font-style: italic'>x}Sr_xFeO_3卤y system by X-ray photoelectron and M枚ssbauer spectroscopy

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• 作者：A.T. Kozakov ; A.G. Kochur ; V.I. Torgashev ; A.A. Bush ; V.Ya. Shkuratov ; S.P. Kubrin ; A.V. Nikolskii ; K.A. Googlev
• 关键词：Bi1&minus ; xSrxFeO3± ; y ceramics ; X-ray photoelectron spectra ; X-ray diffraction ; Mö ; ssbauer spectra ; Fe valence state
• 刊名：Journal of Electron Spectroscopy and Related Phenomena
• 出版年：August, 2013
• 年：2013
• 卷：189
• 期：Complete
• 页码：106-115
• 全文大小：1292 K

文摘

Ceramic samples Bi_1鈭?em>xSr_xFeO_3卤y are synthesized with 0 鈮?#xA0;x 鈮?#xA0;1 by the solid state reaction method. X-ray diffraction study of the samples is performed. Chemical bonding and the valence state of the Fe ions in the Bi_1鈭?em>xSr_xFeO_3卤y ceramics are studied using X-ray photoelectron Fe2p-, Sr3d-, Bi4f-, and O1s-spectra, and M枚ssbauer spectroscopy. Fe2p-spectra for various ionic states of Fe are calculated in an isolated ion approximation. Considerable deviations of actual elemental compositions from nominal ones are discovered. Both Fe³⁺ and Fe⁴⁺ ions are found to be present in the samples with x > 0. Relative Fe³⁺/Fe⁴⁺ contents are determined by comparing the parameters of experimental and theoretical Fe2p-spectra. Concentration of Fe⁴⁺ ions in the samples correlates with that of the Sr atoms.