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- Title
DEPENDENCE OF THE MAGNETIC PROPERTIES OF ALLOYED Co-Ni, Co-Sn, Ni-Sn NANOPOWDERS ON THE ELEMENTAL COMPOSITIONS.
- Authors
Markova, Ivania N.; Georgieva, Milena T.; Piskin, Mehmet B.; Tzankov, Dimitar V.; Gavrilova, Rositca V.; Yordanov, Boyan I.; Zahariev, Ivan I.
- Abstract
Nanopowders of Co-Ni particles (Co:Ni = 50:50, 80:20, and 20:80), Co-Sn particles (Co:Sn = 35:65 and 60:40), and Ni-Sn particles (Ni:Sn = 45:55) are synthesized through a borohydride reduction in a mixture of aqueous solutions of the corresponding metal salts. Additionally carbon nanocomposites are obtained in situ by a template synthesis using a graphite (CF) support including in the presence of ß-cyclodextrin (ß-CDx). The magnetic behavior of the synthesized intermetallic nanoparticles and their carbon composites is studied by a Vibrating Sample Magnetometer (VSM) at room temperature. The hysteresis loops of the synthesized intermetallic nanoparticles with a different elemental composition and their carbon composites are taken up to the maximum magnetic field of 6 kOe. The maximum magnetization varying from 27 to 2.5 emu/g and coercivity of 82 to 20 Oe were measured. The samples showing a relatively high maximum magnetization are the Co-Ni particles synthesized at a ratio of Co:Ni = 80:20 and Co:Ni = 50:50. The maximum magnetization of the Co-Ni particles is higher than that of Co-Sn nanoparticles. The samples of Co-Sn particles (Co:Sn = 35:65) have very low maximum magnetization but rather high coercivity. The samples of Ni-Sn nanoparticles (Ni:Sn = 45:55) are nonmagnetic. The carbon nanocomposites are characterized by significantly lower magnetic parameters than those of the aforementioned nanoparticles. The morphology and the elemental composition studied by SEM and EDS analyses explain this magnetic behavior. The maximum magnetization increases with the increase of Co content in Co-Ni and Co-Sn nanoparticles. When CF carrier is used, the measured maximum magnetization is significantly lower than that in the case when no carrier is used. This decrease in the magnetic properties of the composites could be due to the impurities of CoO and NiO oxides, as well as to the carbon from the CF support used during the particle's template synthesis. Co-Ni nanoparticles (Co Ni=80:20 and Co:Ni = 50:50) shown soft ferromagnetic behavior. Their magnetic properties are appropriate for bio-medical applications such as diagnostic tools and drug delivery for cancer treatment and other diseases.
- Subjects
COBALT-nickel-silicon alloys; BOROHYDRIDE; AQUEOUS solutions; INORGANIC synthesis; CHEMICAL templates
- Publication
Journal of Chemical Technology & Metallurgy, 2019, Vol 54, Issue 1, p163
- ISSN
1314-7471
- Publication type
Article