Results 141 to 150 of about 79,389 (194)

Niobium diffusion in niobium-doped titanium dioxide

Journal of Solid State Electrochemistry, 2008
The present work studied the self-diffusion coefficient of 93Nb in Nb-doped TiO2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O2) = 21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced 93Nb concentration profile was determined by using secondary ion mass spectrometry (SIMS).
Sheppard, LR, Atanacio, AJ, Bak, T, Nowotny, J, Nowotny, MK, Prince, KE   +5 more
openaire   +2 more sources

Niobium and niobium alloys in nuclear power

Nuclear Engineering and Design, 1972
Abstract Niobium and its alloys have been evaluated for a number of terrestrial and space nuclear powered system. After a decade of research and development, many alloys have been developed which meet many of the requirements of long time, high temperature service. A remaining outstanding problem is their interaction with active gases and high purity
D.C. Goldberg, G. Dicker, S.A. Worcester
openaire   +1 more source

Lattice Dynamics of Niobium

Physical Review Letters, 1963
The frequency/wave-vector dispersion relation for symmetry directions in niobium was measured at 296 deg K by means of inelastic neutron scattering. Analysis of the data on the basis of the Born-von Karman theory indicates that the effective interatomic forces are of very long range.
Y. NAKAGAWA, A.D.B. WOODS
openaire   +1 more source

Electron transport in niobium-silicon-niobium structures

IEEE Transactions on Magnetics, 1991
A model is presented for the voltage-carrying state of semiconductor coupled superconducting weak links. Characteristic elements are the Schottky barrier at the interface and a nonequilibrium population of states in the semiconductor. Experimental results of several Nb-Si-Nb structures are shown to be in partial agreement with the model. Deviations are
Heslinga, D.R, van Huffelen, W.M, Klapwijk, T.M   +2 more
openaire   +2 more sources

Determination of niobium in zirconium-niobium alloys

Analytica Chimica Acta, 1964
Abstract A rapid control determination of niobium in 50% zirconium/50% niobium master-alloy is described; it is a direct spectrophotometric procedure, based on the reaction of niobium ions with hydrogen peroxide in concentrated sulphuric acid. The procedure is suitable for the examination of zirconium alloys containing niobium in the range 0.1 to ...
D.P. Wood, M.R. Adams
openaire   +1 more source

Corrosion of Niobium and Niobium Alloys

2005
Abstract For chemical processing, niobium resists a wide variety of corrosive environments, including mineral acids, many organic acids, liquid metals, and most salt solutions. This article focuses on the mechanisms of corrosion resistance of niobium alloys in these environments.
Richard C. Sutherlin, Ronald A. Graham
openaire   +1 more source

Superconductivity in niobium and niobium-tantalum alloys

Journal of Physics and Chemistry of Solids, 1969
Abstract From magnetization measurements in superconducting Nb and Nb-rich Nb-Ta alloys, it was found that the discrepancies between experiment and theory in the upper critical field and two Ginzburg-Landau parameters as a function of temperature in pure Nb are directly related to the anisotropy of the superconducting energy gap, and not to its non ...
Akira Ikushima, Takao Mizusaki
openaire   +1 more source

Subtle niobium

Nature Chemistry, 2015
openaire   +2 more sources

Unusual Mesoporous Titanium Niobium Oxides Realizing Sodium‐Ion Batteries Operated at −40 °C

Advanced Materials, 2022
Nan Wang, Wei Zhang, Chin-Te Hung
exaly  

Recent advances in niobium MXenes: Synthesis, properties, and emerging applications

Matter, 2022
P Abdul Rasheed, Ravi P Pandey, Fawzi Banat   +2 more
exaly