Crystal Structure, Phase and Elemental Composition and Chemical Bonding in Bi1−XAXFeO3±Y Systems (A = Sr, Ca; 0 ≤X ≤ 1) from X-ray Diffraction, Mössbauer, and X-ray Photoelectron Spectra
An integrated study of samples of Bi1−x A x FeO3±y (A = Sr, Ca) systems for 0 ≤ x ≤ 1 (step 0.1) is performed using X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and X-ray photoelectron spectroscopy (XPS). Considerable deviations of actual elemental compositions from nominal ones in the samples of both systems are discovered. Both Fe3+ and Fe4+ ions are found to be present in the samples of the Bi1−x Sr x FeO3±y system with x > 0. No Fe4+ ions are discovered upon substitution of Bi3+ by Ca2+ in Bi1−x Ca x FeO3±y , neither by Mössbauer spectroscopy, nor by XPS. Charge compensation in Bi1−x Ca x FeO3±y takes place mostly via creation of oxygen vacancies.
This study was supported by the Ministry of Education and Science of Russian Federation (grants Nos. 3.6105.2017/BCh, 3.5346.2017/BCh, and RFMEFI60714X0110).
- 8.M.E. Matsnev, V.S. Rusakov, Conf. Proc. 1489, 178 (2012)Google Scholar