| Autor: |
M. V. Yarmolich, N. A. Kalanda, S. E. Demyanov, L. I. Hurski, L. V. Kovalev, A. I. Galyas |
| Jazyk: |
ruština |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Doklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektroniki, Vol 0, Iss 3, Pp 63-68 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1729-7648 |
| Popis: |
Single-phase nanosized Sr2FeMoO6-δ powders were synthesized by citrate-gel method at pH = 4, 6, 9, with various degrees of superstructural ordering of Fe3+ and Mo5+ cations ( P = 65 % for pH = 4, P = 51 % for pH = 6 and P = 20 % for pH = 9). According to the XPS analysis results, mixed valence state of cations iron and molybdenum was established. With increasing of pH, the Fe2+ concentration value rises from 63 % to 72 %, whereas the Fe+3 concentration drops from 37 % to 28 %. According to the results of investigations of magnetization temperature dependence performed in ZFC (zero-field cooling) and FC (field cooling) modes a metastable superparamagnetic state in low-dimensional grains of Sr2FeMoO6-d ferrimagnetic powders at T < 19 K was established. In powders with pH = 4 the number of low dimensional grains is significantly larger than powders with pH = 6 and 9. This has led to their large magnetization value at T = (4,2-19) K. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
