M.V. Yarmolich, N.A. Kalanda, S.E. Demyanov, L.I. HURSKI, L.V. Kovalev, A.I. Galyas
Abstract
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.
About the Authors
M. V. Yarmolich
ГО «НПЦ НАН Беларуси по материаловедению»
Belarus
Belarus
N. A. Kalanda
ГО «НПЦ НАН Беларуси по материаловедению»
Belarus
Belarus
S. E. Demyanov
ГО «НПЦ НАН Беларуси по материаловедению»
Belarus
Belarus
L. I. Hurski
Белорусский государственный университет информатики и радиоэлектроники
Belarus
Belarus
L. V. Kovalev
ГО «НПЦ НАН Беларуси по материаловедению»
Belarus
Belarus
A. I. Galyas
ГО «НПЦ НАН Беларуси по материаловедению»
Belarus
Belarus
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Review
For citations:
Yarmolich M.V., Kalanda N.A., Demyanov S.E., Hurski L.I., Kovalev L.V., Galyas A.I. M.V. Yarmolich, N.A. Kalanda, S.E. Demyanov, L.I. HURSKI, L.V. Kovalev, A.I. Galyas. Doklady BGUIR. 2016;(3):63-68. (In Russ.)
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