Concept

Niobium

Publications associées (167)

Combinatorial Chemical Beam Epitaxy of Lithium Niobate Thin Films on Sapphire

Paul Muralt, Patrik Willi Hoffmann, Silviu Cosmin Sandu, Ali Dabirian, Yury Kuzminykh, Estelle Wagner, Scott Harada, Giacomo Benvenuti

A combinatorial chemical beam epitaxy technique was used to optimize deposition of (001) lithium niobate thin films on {001} sapphire substrates. Lithium tert-butoxide [Li(OBut)] and niobium tetra-ethoxy di-methyl-amino-ethoxide [Nb(OEt)(4)(dmac)] were use ...

Electrochemical Society2011

Novel counter electrode catalysts of niobium oxides supersede Pt for dye-sensitized solar cells

Ulf Anders Hagfeldt

Synthesized niobium oxides (Nb2O5 and NbO2) were applied for the first time as counter electrodes (CEs) in dye-sensitized solar cells (DSCs). The DSC using NbO2 CE showed a higher power conversion efficiency of 7.88%, compared with that of the DSC using Pt ...

2011

Selective three-phase hydrogenation of aromatic nitro-compounds over beta-molybdenum nitride

Lioubov Kiwi, Fernando Cardenas Lizana, Daniel André Samuel Lamey

A tetragonal molybdenum nitride (beta-Mo2N) has been prepared by temperature programmed treatment of MoO3 in flowing N-2 + H-2 and for the first time shown to catalyze the liquid phase selective hydrogenation (T = 423 K; P-H2 = 11 bar) of a series of para- ...

2011

Tribocorrosion behavior of beta titanium alloys in physiological solutions containing synovial components

Stefano Mischler

In this work, the tribocorrosion behavior of Ti-12.5Mo, Ti-13Nb-13Zr and Ti-29Nb-13Ta-4.6Zr beta titanium alloys which are candidate biomaterials for joint prostheses is studied against ultra high molecular weight polyethylene in Hank's balanced salt solut ...

2011

Rods of Neutron Scattering Intensity in Yb2Ti2O7: Compelling Evidence for Significant Anisotropic Exchange in a Magnetic Pyrochlore Oxide

Henrik Moodysson Rønnow

Paramagnetic correlations in the magnetic material Yb2Ti2O7 have been investigated via neutron scattering, revealing a [111] rod of scattering intensity. Assuming interactions between the Yb3+ ions composed of all symmetry-allowed nearest neighbor exchange ...

American Physical Society2011

Fretting-corrosion behavior of beta titanium alloys in simulated synovial fluid

Stefano Mischler

Fretting-corrosion is a material degradation process resulting from the combined action of a corrosive environment and small displacement fretting wear. In this work, the fretting-corrosion behavior of Ti-12.5Mo, Ti-13Nb-13Zr, and Ti-29Nb-13Ta-4.6Zr, beta ...

2011

β-Molybdenum nitride: synthesis mechanism and catalytic response in the gas phase hydrogenation of p-chloronitrobenzene

Lioubov Kiwi, Fernando Cardenas Lizana

A temperature programmed treatment of MoO3 in flowing N-2 + H-2 has been employed to prepare beta-phase molybdenum nitride (beta-Mo2N) which has been used to promote, for the first time, the catalytic hydrogenation of p-chloronitrobenzene. The reduction/ni ...

2011

Band offsets at Ge/GeO2 interfaces: Effect of different interfacial bonding patterns

Alfredo Pasquarello, Peter Broqvist, Jan Felix Binder

Using hybrid density functional calculations, we investigate possible origins for the large variation of band offsets measured at Ge/GeO2 interfaces. We consider atomistic model interfaces with both amorphous and crystalline oxides, in which the bond densi ...

Elsevier2011

Electron density of states at Ge/oxide interfaces due to GeOx formation

Alfredo Pasquarello, Peter Broqvist, Jan Felix Binder

An atomistic model of substoichiometric germanium oxide is generated through ab initio molecular dynamics. The resulting structure shows a predominance of threefold coordinated Ge and O atoms. We also generate substoichiometric models through bond-switchin ...

Elsevier2011

Test of ITER conductors in SULTAN: an update

Pierluigi Bruzzone, Boris Stepanov, Rainer Wesche, Martin Vogel, Ciro Calzolaio

The ITER Toroidal Field (TF) conductor qualification phase has been carried out by testing short sample prototype conductors in the SULTAN test facility. This phase, started in 2007, has been substantially completed after minor adjustment of the conductor ...

2011

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