Structural and Magnetic Properties of Nickel Oxide Nanopowders

Abstract

Structure and magnetic properties of nickel oxide (NiO) nanopowders have been studied by X-ray/neutron diffraction, SQUID magnetometer, and micro-Raman spectroscopy. Our diffraction data indicate that at room temperature all NiO powders are antiferromagnetically ordered and have a rhombohedral (R-3m) phase. The SQUID magnetometry and Raman spectroscopy measurements support the presence of the antiferromagnetic ordering.

Tribo-Mechanisms of Carbon Nanotubes: Friction and Wear Behavior of CNT-Reinforced Nickel Matrix Composites and CNT-Coated Bulk Nickel

“…Regarding the surface chemistry after the tribological experiments, all studied cases showed the presence of Ni oxide (NiO) [46,47]. This is straightforwardly detected with Raman spectroscopy by observing the resonance at 550 and 1100 cm −1 .…”

Neutron scattering study of structural and magnetic size effects in NiO

“…The existence of AFM ordering at room temperature in NiO nanopowders with the crystallite sizes of 13-1500 nm has been recently confirmed in [6] by several experimental techniques, including neutron diffraction. It was also found that the crystal lattice of nanoparticles in AFM phase experiences weak rhombohedral distortion as in the bulk NiO [6].…”

“…Four NiO samples (S1, S2, S3, S4) were prepared according to the procedure described in [6]. The grain average sizes determined from the BET specific surface area measurements were 13 nm (S1), 100 nm (S2), 138 nm (S3) and 1500 nm (S4).…”

“…It was also found that the crystal lattice of nanoparticles in AFM phase experiences weak rhombohedral distortion as in the bulk NiO [6].…”

Synthesis of Ag/NiO composite nanosheets and empty microspheres and their highly effective electrocatalytic properties

“…Of the oxides, nickel oxide (NiO), an important p-typed semiconductor with stable band gap, has received much attention and been extensively studied and used frequently as electrode for lithium ion batteries and funnel cells [11,12], catalysts [13][14][15], electrochemical supercapacitors [16,17], dyesensitized photocathodes [18], magnetic materials [19,20], etc. However, with fast advancements in all areas of industry and technology, the pure NiO nanomaterials do not meet with the increasingly expanding commands.…”