Structural and magnetic properties of ferromagnetic nano-sized (Ni1−xCox)0.85Se prepared by simple hydrothermal method

Structural, magnetic, and optical properties of nano‐sized Ni0.85Se

“…Miller et at measured the magnetic susceptibility at different values of x for the systems Ni 7 Se 8− x S x and Co 7 Se 8− x S x and showed that all samples display temperature‐independent paramagnetism from 25 to 250 K . In a recent work, we found a ferromagnetic behavior for nanocrystalline Ni 0.85 Se and Co 0.85 Se. Such different results reported for magnetic properties are mainly related to the structural and microstructural properties of the investigated material, which depends essentially on the method and conditions of preparation.…”

“…The FC and ZFC curves are split at low temperature and coincident at high temperature. This indicates that the ferromagnetic order is below about 14 K for Ni 0.85 Se, which is less than NiSe sample prepared by the same method occurring at 20 K. Previously we studied the M–H dependence at room temperature for Nano (Ni 1− x Co x ) 0.85 Se with 0.0 ≤ x ≤ 1 solid solutions; in which Ni 0.85 Se sample exhibits a weak ferromagnetic behavior for the first time in this composition due to uncompensated spins at the surface, Figure B.…”

“…Ni 0.85 Se nanocrystalline sample was prepared applying a simple hydrothermal route . In a typical experimental procedure, an aqueous solution was formed by dissolving the proper amount of NiCl 2 .6H 2 O and Na 2 SeO 3 in distilled water.…”

Co0.85Se magnetic nanoparticles supported on carbon nanotubes as catalyst for hydrogen evolution reaction

“…The Hc increased from 55.09 Oe for the Co0.85Se nanoparticles to 158 Oe for the MWCNTs/Co0.85Se nanocomposites ( Fig. 6(b)) due to the increase in the distance between the Co0.85Se nanoparticles, which resulted in weaker interparticle dipolar interactions [42,43]. The decrease in crystallite size and the increase in inter-nanoparticle distance enhanced the specific surface area of the MWCNTs/Co0.85Se catalyst, which is beneficial for the electrocatalytic activity for HER [44].…”

Sacrificial template synthesis of (CoxNi1−x)0.85Se nanostructures with different morphologies for reduction of 4-nitrophenol

“…28 However, studies which focus on the synthesis of Co x Ni y Se crystallites, especially 2D or 3D crystallites, are very limited. Up to now, there has been only one report on the preparation of ferromagnetic IJCo x Ni 1−x ) 0.85 Se nanoparticles by a hydrothermal method, 29 but their catalytic properties have not yet been investigated. Therefore, the synthesis of Co x Ni y Se crystallites with excellent physical and chemical properties through adjusting their sizes, compositions, or shapes is still a challenge.…”