|
This article is cited in 5 scientific papers (total in 5 papers)
MISCELLANEOUS
Soft X-ray absorption spectroscopy as a method to study Y$_{1-y}$Ca$_{y}$BaCo$_{4-x}M_x$O$_7$ cobaltites ($M=$ Fe, Zn)
V. R. Galakhovab, S. N. Shamina, V. V. Mesilova a Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
b Ural Federal University, Yekaterinburg, Russia
Abstract:
Soft X-ray absorption spectroscopy has been used to determine the charge state and content of cobalt ions in doped cobaltites CaBaCo$_{4}$O$_{7}$, Y$_{0.5}$Ca$_{0.5}$BaCo$_{4}$O$_{7}$, Y$_{0.5}$Ca$_{0.5}$BaCo$_{4-x}$Fe$_x$O$_{7}$, and Y$_{0.5}$Ca$_{0.5}$BaCo$_{4-z}$Zn$_z$O$_{7}$. A method has been proposed to determine the relative concentrations of cobalt ions in barium-containing cobaltites from the relative intensities of X-ray absorption Со $L_3$/Ba $M_5$ spectra, and the relative contents of both Fe and Zn doping elements and Co$^{2+}$ and Co$^{3+}$ ions have been determined. It has been found that the substitution of iron ions for some cobalt ions (cobaltite Y$_{0.5}$Ca$_{0.5}$BaCo$_{4-x}$Fe$_x$O$_{7}$) transforms some Co$^{3+}$ ions to Co$^{2+}$ ions. It has been found that iron ions are in the $3+$ charge state and have tetrahedral coordination with oxygen ions. The substitution of divalent zinc ions for some cobalt ions (cobaltite Y$_{0.5}$Ca$_{0.5}$BaCo$_{4-z}$Zn$_z$O$_{7}$) increases the concentration of high-spin Co$^{3+}$ ions. The tetrahedral coordination of the Co$^{2+}$ and Co$^{3+}$ ions has been confirmed.
Received: 29.03.2018
Citation:
V. R. Galakhov, S. N. Shamin, V. V. Mesilov, “Soft X-ray absorption spectroscopy as a method to study Y$_{1-y}$Ca$_{y}$BaCo$_{4-x}M_x$O$_7$ cobaltites ($M=$ Fe, Zn)”, Pis'ma v Zh. Èksper. Teoret. Fiz., 107:9 (2018), 610–614; JETP Letters, 107:9 (2018), 583–587
Linking options:
https://www.mathnet.ru/eng/jetpl5570 https://www.mathnet.ru/eng/jetpl/v107/i9/p610
|
Statistics & downloads: |
Abstract page: | 159 | Full-text PDF : | 9 | References: | 16 | First page: | 4 |
|