Oxygen transport properties of nanostructured SrFe1 − x Mo x O2.5 + 3/2x (0 < x < 0.1) perovskites

Ferroelasticity of SrCo0.8Fe0.2O3–δperovskite-related oxide with mixed ion–electron conductivity

“…BM transition owing to the absorption of residual oxygen from the column of the microscope. However, it was demonstrated by us previously that the data of the Williamson-Hall analysis are in good agreement with the microscopic data; similar XRD patterns with low-intensity diffuse maxima were obtained for the SrFe 0.95 Mo 0.05 O 2.57 sample, and it was demonstrated that the domain size estimated from reflection width agrees with the domain size observed with the help of TEM (Savinskaya & Nemudry, 2011).…”

“…1). More detailed studies of these materials involving modern X-ray diffractometers and synchrotron radiation showed that in addition to intense reflections related to the long-rangeordered cubic perovskite sublattice there were low-intensity diffuse maxima related to the nanosized range order of the oxygen vacancies in brownmillerite domains (Lindberg et al, 2004;Savinskaya & Nemudry, 2011;Basile & Gallucci, 2011). The presence of the weak diffuse superlattice reflections related to the formation of ordered 1:1 nanosized domains is also observed for relaxor ferroelectrics, e.g.…”

Investigation of the microstructural features of SrCo0.8Fe0.2O3−δ perovskite

“…In [21], S. Adler, with the help of high-temperature NMR, showed the co-existence of both mobile and immobile oxygen ions in the perovskites at T>800°C, this fact is also in agreement with the model of microdomain structure of high-temperature perovskite phases. The high-temperature X-ray diffraction data for SrFeO 3−z and SrFe 1−x Mo x O 3−z , described in [22,23] provide evidence that the stability of vacancy-ordered phases increases with increasing vacancy concentration, as a result, the structure of brownmillerite and nanodomains texture based on it are stable at low oxygen partial pressures up to T 1,200°C. It was also shown in [24] that the brownmillerite structure SrCo 0.8 Fe 0.2 O 2.5 is stable in vacuum (P~10 −5 atm) at high temperatures (T~1,200°C).…”

STUDY OF THE STRUCTURAL FEATURES OF NONSTOICHIOMETRIC SrCo0,8-xFe0,2WxO3-d (0 < x < 0,1) PEROVSKITES

“…Ɉɞɧɚɤɨ ɷɬɢ ɦɚɬɟɪɢɚɥɵ ɨɛɥɚɞɚɸɬ ɧɟɞɨɫɬɚɬɤɚɦɢ: ɧɚɥɢɱɢɟ ɮɚɡɨɜɵɯ ɩɪɟɜɪɚɳɟɧɢɣ ɜ ɨɛɥɚɫɬɢ ɪɚɛɨɱɢɯ ɬɟɦɩɟɪɚɬɭɪ, ɱɬɨ ɫɧɢɠɚɟɬ ɢɯ ɦɟɯɚɧɢɱɟɫɤɭɸ ɩɪɨɱɧɨɫɬɶ, ɧɢɡɤɚɹ ɯɢɦɢɱɟɫɤɚɹ ɫɬɚɛɢɥɶɧɨɫɬɶ ɩɪɢ ɩɨɧɢɠɟɧɧɨɦ ɩɚɪɰɢɚɥɶɧɨɦ ɞɚɜɥɟɧɢɢ ɤɢɫɥɨɪɨɞɚ, ɚ ɬɚɤɠɟ ɢɯ ɞɟɝɪɚɞɚɰɢɹ ɜ ɩɪɢɫɭɬɫɬɜɢɢ CO 2 [ 2 ]. Ⱦɥɹ ɦɨɞɢɮɢɤɚɰɢɢ ɮɭɧɤɰɢɨɧɚɥɶɧɵɯ ɫɜɨɣɫɬɜ ɦɟɦɛɪɚɧɧɵɯ ɦɚɬɟɪɢɚɥɨɜ ɪɚɧɟɟ ɧɚɦɢ ɩɪɟɞɥɨɠɟɧɨ ɱɚɫɬɢɱɧɨ ɡɚɦɟɳɚɬɶ ȼ-ɤɚɬɢɨɧɵ (Co/Fe) ɧɚ ɜɵɫɨɤɨɡɚɪɹɞɧɵɟ ɤɚɬɢɨɧɵ Nb/Ta (V) ɢ Mo/W (VI) [3][4][5][6]. ȼ ɪɚɛɨɬɟ [ 7 ] [ 10 ] ɞɟɬɚɥɶɧɵɟ ɫɬɪɭɤɬɭɪɧɵɟ ɢɫɫɥɟɞɨɜɚɧɢɹ Sr 2 CoWO 6 ɫ ɩɨɦɨɳɶɸ ɞɢɮɪɚɤɰɢɢ ɫ ɢɫɩɨɥɶɡɨɜɚɧɢɟɦ ɫɢɧɯɪɨɬɪɨɧɧɨɝɨ ɢɡɥɭɱɟɧɢɹ ɢ ɞɢɮɪɚɤɰɢɢ ɧɟɣɬɪɨɧɨɜ ɩɨɤɚɡɚɥɢ, ɱɬɨ ɩɪɢ ɤɨɦɧɚɬɧɨɣ ɬɟɦɩɟɪɚɬɭɪɟ ɫɬɪɭɤɬɭɪɭ ɞɚɧɧɨɝɨ ɫɨɟɞɢɧɟɧɢɹ ɦɨɠɧɨ ɩɪɟɞɫɬɚɜɢɬɶ ɤɚɤ ɫɦɟɫɶ ɦɨɧɨɤɥɢɧɧɨɣ (P2 1 /n) ɢ ɬɟɬɪɚɝɨɧɚɥɶɧɨɣ (I4/m) ɤɪɢɫɬɚɥɥɢɱɟɫɤɢɯ ɫɬɪɭɤɬɭɪ.…”

“…ɋɨɝɥɚɫɧɨ ɫɬɪɭɤɬɭɪɧɨɦɭ ɚɧɚɥɢɡɭ ɫ ɩɨɦɨɳɶɸ ɦɟɬɨɞɚ Ɋɢɬɜɟɥɶɞɚ, ɪɨɫɬ ɫɨɞɟɪɠɚɧɢɹ ɞɨɩɚɧɬɚ ɩɪɢɜɨɞɢɬ ɤ ɬɪɚɧɫɮɨɪɦɚɰɢɢ ɪɨɦɛɢɱɟɫɤɨɣ ɫɬɪɭɤɬɭɪɵ ɛɪɚɭɧɦɢɥɥɟɪɢɬɚ Ibmm ɜ ɫɬɪɭɤɬɭɪɭ ɤɭɛɢɱɟɫɤɨɝɨ ɩɟɪɨɜɫɤɢɬɚ Pm ɛɚɥɶɬɢɬɚ ɫɬɪɨɧɰɢɹ ɢ, ɤɚɤ ɛɵɥɨ ɩɨɤɚɡɚɧɨ ɪɚɧɟɟ, ɫɜɹɡɚɧɵ ɫ ɨɛɪɚɡɨɜɚɧɢɟɦ ɧɚɧɨɪɚɡɦɟɪɧɵɯ 90q ɞɨɦɟɧɨɜ ɫɨ ɫɬɪɭɤɬɭɪɨɣ ɛɪɚɭɧɦɢɥɥɟɪɢɬɚ [ 5,[13][14][15]. ɉɨɜɵɲɟɧɢɟ ɤɨɧɰɟɧɬɪɚɰɢɢ ɞɨɩɚɧɬɚ ɩɪɢɜɨɞɢɬ ɤ ɫɧɢɠɟɧɢɸ ɪɚɡɦɟɪɨɜ ɞɨɦɟɧɨɜ/ɞɜɨɣɧɢɤɨɜ (ɫ 100 ɞɨ 55 ɧɦ), ɨ ɱɟɦ ɜ ɧɚɲɟɦ ɫɥɭɱɚɟ ɫɜɢɞɟɬɟɥɶɫɬɜɭɟɬ ɭɲɢɪɟɧɢɟ ɪɟɮɥɟɤɫɨɜ, ɧɚɩɪɢɦɟɪ ɪɟɮɥɟɤɫɚ (020), ɜɩɥɨɬɶ ɞɨ ɢɯ ɩɨɥɧɨɝɨ ɪɚɡɦɵɬɢɹ ɜ ɮɨɧɟ (x = 0,2).…”