LOW-TEMPERATURE MAGNETIC ORDERING IN Sr2FeMoO6–δ NANO-SIZED GRAINS
Abstract
Single-phase nanosized Sr2FeMoO6-d powders were synthesized by the citrate-gel-method at pH = 4, 6, 9, with various degrees of superstructural ordering of Fe3+ and Mo5+ (P = 65% for pH = 4, P = 51% for pH = 6 and P = 20 % for pH = 9). Grain size of the powders are in the range of 200–600 nm. With that, the largest number of grains having a size of 550 nm was characteristic for powders with pH = 9 and 230 nm for pH = 4. It was established that the value of P decreases with increasing pH, which indicates an increase in the number of –Fe2+-О2--Fe2+- clusters with antiparallel distribution of iron spins which leads to a decrease in the total magnetic moment and the Curie temperature. In powders with pH = 4 the number of low dimensional grain is significantly larger than in powders with pH = 6 and 9, which led to their large magnetization value at T = 4,2- 19 K.
About the Authors
M. V. YARMOLICH
The Scientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus
Belarus
Belarus
N. A. KALANDA
The Scientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus
Belarus
Belarus
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