Spectroscopic characterization of iron bismuth (antimony/tantalum) pyrochlores synthesized by the molten salts method

Polycrystalline samples of iron bismuth antimony pyrochlore (Bi1.48Fe0.10)(Sb1.48Fe0.59)O7 and iron bismuth tantalum pyrochlore (Bi1.51Fe0.06)(Ta1.51Fe0.55)O7 were synthesized by the molten salts method. The crystalline structures were determined by X ray diffraction and Rietveld refinement. Through...

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Published inCeramics international Vol. 47; no. 22; pp. 31983 - 31989
Main Authors León-Flores, J., Pérez-Mazariego, J.L., Flores-Morales, S.S., Hinojosa, R., Arévalo-López, E.P., Escamilla, R., Gómez, R.W.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.11.2021
Subjects
Molten salts method
Mössbauer spectroscopy
Pyrochlore
X-ray photoelectron spectroscopy
Pyrochlore
Molten salts method
X-ray photoelectron spectroscopy
Mössbauer spectroscopy
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Summary:Polycrystalline samples of iron bismuth antimony pyrochlore (Bi1.48Fe0.10)(Sb1.48Fe0.59)O7 and iron bismuth tantalum pyrochlore (Bi1.51Fe0.06)(Ta1.51Fe0.55)O7 were synthesized by the molten salts method. The crystalline structures were determined by X ray diffraction and Rietveld refinement. Through Mössbauer and X-ray photoelectron spectroscopies (XPS), the distribution and the ionic states of the cations in the pyrochlore structure were investigated. Additionally, through XPS and UV–Vis spectroscopy via diffuse reflection measurements, the optical bandgaps were obtained Eg = 2.78 eV for the Sb pyrochlore and Eg = 2.70 eV for the Ta pyrochlore together with the energetic location of the valence and conduction band. [Display omitted]
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2021.08.084