Results of density-functional calculations for isolated transition metal (TM = V, Cr, Mn, Fe, Co, Ni on cation sites) doped GaN demonstrate a novel magnetic metastability in dilute magnetic semiconductors. In addition to the expected high spin ground states (4muB/Mn and 5muB/Fe), there are also metastable low spin states (0muB/Mn and 1muB/Fe)--a phenomenon that can be explained in simple terms ...

Using Fe-Au and Ni-Au thin films as catalysts for the VLS growth of Bi 2 Se 3 nanoribbons, we obtain two distinct morphologies in the case of Fe-Au thin films and three distinct morphologies in the case of Ni-Au thin films. For Fe-doped Bi 2 Se 3 nanoribbons, we observe wide nanoribbons (Fig. S1(c,d)) and narrow, long nanoribbons (Fig. S1(e,f)). For Ni-doped Bi 2 Se 3 nanoribbons, we observe wi...

Spherical MCM-48 mesoporous sieve co-doped with vanadium and iron was successfully synthesized via one-step hydrothermal method. The material was characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms, inductively coupled plasma (ICP), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance UV-vis spectra, and X-ray photoelectr...

A facile organic-phase synthesis of monodisperse barium-doped iron oxide (Ba-Fe-O) nanoparticles (NPs) is reported. The Ba-Fe-O NPs can be converted into hexagonal barium ferrite NPs at 700 °C, showing strong ferromagnetic properties with H(c) reaching 5260 Oe and M(s) at 54 emu g(-1). Moreover, the Ba-Fe-O NPs can be assembled into densely packed magnetic arrays, providing a unique model syste...

Articles you may be interested in The study of the mechanical properties of Au films by nanoindentation techniques AIP Conf. High magnetic field annealing effect on visible photoluminescence enhancement of TiO2 nanotube arrays Appl. Magnetic and mechanical properties of rolled-up Au/Co/Au nanomembranes with multiple windings Direct observation of twin deformation in YBa2Cu3O7− x thin films by i...

N,S,Fe-doped graphene nanosheets were directly synthesized from aminothiazole, a precursor molecule that contains N and S atoms, through Fe catalysis under heat treatment. The graphene nanosheets exhibited high electrocatalytic activity toward oxygen reduction reaction in both acidic and alkaline media during rotating disk electrode half-cell and fuel cell tests.

The generation and the removal of the various optical absorption bands in natural amethyst and in synthetic a-quartz doped with either Fe'* or Fe"* ions has been surveyed. Fositive rhombohedral growth regions of synthetic a-qvattz containing Fe'* ion proved to be related to the generation of the amethyst color upon treatment with ionizing radiation. It is believed that the interstitial Fe'* ion...

The effect of impurities on quantum chemical parameters of single-walled nanotubes (SWNTs) was studied using density functional theory (DFT). The density of states (DOS), Fermi energy and thermodynamic energies of (5,5) carbon nanotubes were calculated in the presence of nitrogen impurity. It was found that this nanotube remains metallic after being doped with one nitrogen atom. The partial den...

In this research, the effects of HCN adsorption on the surface of the pristine, Ge, P, and GeP doped boron nitride nanotube (BNNTs) are investigated by using density function theory at the B3LYP/6–31G(d, p) level of theory. At the first step, we consider different configurations for adsorbing HCN molecule on the surface of BNNTs. The optimized models are used to calculate the structural, electr...