Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate
Sr2FeMoO6–δ single-phase samples without Fe/Mo cations superstructural ordering (P) and with Curie temperature 407 K were obtained by the solid-phase technique. According to the XRD data, the growth dynamics of the parameter P is nonlinear. In this case, the process of reaching maximum values of P (...
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Educational institution «Belarusian State University of Informatics and Radioelectronics»
2021-03-01
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| Series: | Doklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektroniki |
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| Online Access: | https://doklady.bsuir.by/jour/article/view/3030 |
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| author | L. I. Hurski N. A. Kalanda М. V. Yarmolich А. V. Petrov D. A. Golosov М. V. Kirosirova О. V. Ignatenko А. L. Zhaludkevich |
| author_facet | L. I. Hurski N. A. Kalanda М. V. Yarmolich А. V. Petrov D. A. Golosov М. V. Kirosirova О. V. Ignatenko А. L. Zhaludkevich |
| author_sort | L. I. Hurski |
| collection | DOAJ |
| description | Sr2FeMoO6–δ single-phase samples without Fe/Mo cations superstructural ordering (P) and with Curie temperature 407 K were obtained by the solid-phase technique. According to the XRD data, the growth dynamics of the parameter P is nonlinear. In this case, the process of reaching maximum values of P (Pmax) is long and its rate is several times lower than the change of the oxygen index 6–δ. It was found that with increasing temperature of isothermal annealing, P increases and reaches maximal values 88 % at T = 1320 K for 120 h, Pmax = 92 % at T = 1420 K for 100 h, while Pmax = 90 % at T = 1470 K for 45 h. One can assume that the lower values of Pmax at T = 1470 K than at T = 1420 K are due to the influence of thermal energy on the destruction of chain ordering of Fe and Mo cations placed in staggered order. Based on the analysis of P time dependences, two relaxation processes can be found and the dP/dt = ¦(t) can be divided into two regions – I and II. In the region I the relaxation time is shorter than that in the region II. The point is that the ordering of cations in the –O–Fe–O–Mo–O chains in the region I requires atomic displacements by approximately one interatomic distance, whereas in the region II cation displacements occur over long distances with the formation of long[1]chain long-range ordering. |
| format | Article |
| id | doaj-art-409818f3bc2a4ad7918a1f7915bd96d2 |
| institution | DOAJ |
| issn | 1729-7648 |
| language | Russian |
| publishDate | 2021-03-01 |
| publisher | Educational institution «Belarusian State University of Informatics and Radioelectronics» |
| record_format | Article |
| series | Doklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektroniki |
| spelling | doaj-art-409818f3bc2a4ad7918a1f7915bd96d22025-08-20T03:02:34ZrusEducational institution «Belarusian State University of Informatics and Radioelectronics»Doklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektroniki1729-76482021-03-01192142110.35596/1729-7648-2021-19-2-14-211676Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdateL. I. Hurski0N. A. Kalanda1М. V. Yarmolich2А. V. Petrov3D. A. Golosov4М. V. Kirosirova5О. V. Ignatenko6А. L. Zhaludkevich7Belarusian State University of Informatics and RadioelectronicsScientific-Practical Materials Research Centre of NAS of BelarusScientific-Practical Materials Research Centre of NAS of BelarusScientific-Practical Materials Research Centre of NAS of BelarusBelarusian State University of Informatics and RadioelectronicsThe State Centre “Belmikroanaliz” of the “Integral”Scientific-Practical Materials Research Centre of NAS of BelarusНаучно-практический центр Национальной академии наук Беларуси по материаловедениюSr2FeMoO6–δ single-phase samples without Fe/Mo cations superstructural ordering (P) and with Curie temperature 407 K were obtained by the solid-phase technique. According to the XRD data, the growth dynamics of the parameter P is nonlinear. In this case, the process of reaching maximum values of P (Pmax) is long and its rate is several times lower than the change of the oxygen index 6–δ. It was found that with increasing temperature of isothermal annealing, P increases and reaches maximal values 88 % at T = 1320 K for 120 h, Pmax = 92 % at T = 1420 K for 100 h, while Pmax = 90 % at T = 1470 K for 45 h. One can assume that the lower values of Pmax at T = 1470 K than at T = 1420 K are due to the influence of thermal energy on the destruction of chain ordering of Fe and Mo cations placed in staggered order. Based on the analysis of P time dependences, two relaxation processes can be found and the dP/dt = ¦(t) can be divided into two regions – I and II. In the region I the relaxation time is shorter than that in the region II. The point is that the ordering of cations in the –O–Fe–O–Mo–O chains in the region I requires atomic displacements by approximately one interatomic distance, whereas in the region II cation displacements occur over long distances with the formation of long[1]chain long-range ordering.https://doklady.bsuir.by/jour/article/view/3030strontium ferromolybdatesuperstructural ordering of cationsoxygen non-stoichiometry |
| spellingShingle | L. I. Hurski N. A. Kalanda М. V. Yarmolich А. V. Petrov D. A. Golosov М. V. Kirosirova О. V. Ignatenko А. L. Zhaludkevich Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate Doklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektroniki strontium ferromolybdate superstructural ordering of cations oxygen non-stoichiometry |
| title | Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate |
| title_full | Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate |
| title_fullStr | Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate |
| title_full_unstemmed | Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate |
| title_short | Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate |
| title_sort | сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of fe mo cations in the strontium ferromolybdate |
| topic | strontium ferromolybdate superstructural ordering of cations oxygen non-stoichiometry |
| url | https://doklady.bsuir.by/jour/article/view/3030 |
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