Synthesis of ferromagnetic alloys of the InSb–Ni2–yMnSb system (y = 0; 1)

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Resumo

Composite alloys of the InSb–Ni2–yMnSb system (y = 0, 1) have been synthesized. According to X-ray diffraction data, all samples contained a ferromagnetic phase based on the NiMnSb compound in the form of nano-sized inclusions and agglomerates with characteristic sizes of 50-90 nm and Curie temperature Tc = 727–732 K. Absence of the Ni2MnSb phase in the sample (InSb)100–x (Ni2MnSb)x (x = 5) indicates its instability when alloyed with InSb.

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Sobre autores

O. Pashkova

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Autor responsável pela correspondência
Email: olg-pashkova@yandex.ru
Rússia, Moscow, 119991

L. Oveshnikov

National Research Center ‘‘Kurchatov Institute’’

Email: olg-pashkova@yandex.ru
Rússia, Moscow, 123182

A. Ril

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: olg-pashkova@yandex.ru
Rússia, Moscow, 119991

P. Dmitryakov

National Research Center ‘‘Kurchatov Institute’’

Email: olg-pashkova@yandex.ru
Rússia, Moscow, 123182

V. Sanygin

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: olg-pashkova@yandex.ru
Rússia, Moscow, 119991

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2. Fig. 1. Diffractograms of A1-A3 composites in comparison with reference data for InSb precursor powder (a). Asterisks indicate the areas of occurrence of additional peaks in the composite samples. Enlarged areas of (111) InSb (b) and (531) InSb (c) peaks for the investigated samples showing the absence of a significant shift along the 2θ axis.

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3. Fig. 2. Diffractograms of the studied A1-A3 composites in the low-intensity region (a). Symbols mark all observed peaks not belonging to the InSb phase. These weak peaks can be indexed within the NiMnSb, NiSb, MnSb and In phases. Diffractograms of NiMnSb and Ni2MnSb precursors used in the growth of composite samples (b).

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4. Fig. 3. TGA curves in magnetic field obtained for NiMnSb (a) and Ni2MnSb (b) precursors and A1 and A3 composites (c). The curve of sample A1 is vertically shifted by 0.1%.

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