Sintered Mg2Ni intermetallide — A hydrogen accumulator. II. Influence of impurities on the hydrogen-absorbing properties of the intermetallide

1992 ◽  
Vol 31 (11) ◽  
pp. 940-942
Author(s):  
M. M. Antonova ◽  
T. V. Khomko ◽  
O. T. Khorpyakov
Keyword(s):  
Hydrogen Accumulator ◽  
Influence Of Impurities

Influence of impurities on edge turbulence and transport in TEXT

1991 ◽  
Vol 31 (9) ◽  
pp. 1661-1666 ◽  
Author(s):  
C. Hidalgo ◽  
C.P. Ritz ◽  
T.L. Rhodes ◽  
W.L. Rowan ◽  
P.H. Diamond ◽  
...  
Keyword(s):  
Influence Of Impurities

Influence of impurities on broadbandp-type-Ge laser spectra under uniaxial stress

1993 ◽  
Vol 47 (24) ◽  
pp. 16586-16589 ◽  
Author(s):  
W. Heiss ◽  
C. Kremser ◽  
K. Unterrainer ◽  
G. Strasser ◽  
E. Gornik ◽  
...  
Keyword(s):  
Uniaxial Stress ◽  
Influence Of Impurities

Doping Effect in Nickel Oxide

2009 ◽  
Vol 289-292 ◽  
pp. 775-782 ◽  
Author(s):  
Zbigniew Jurasz ◽  
Krzysztof Adamaszek ◽  
Romuald Janik ◽  
Zbigniew Grzesik ◽  
Stanisław Mrowec
Keyword(s):  
Activation Energy ◽  
Nickel Oxide ◽  
High Temperatures ◽  
Oxygen Pressure ◽  
Pressure Dependence ◽  
Oxidation Rate ◽  
Doping Effect ◽  
Self Diffusion ◽  
Electron Holes ◽  
Influence Of Impurities

Detailed investigations of nonstoichiometry as well as chemical and self-diffusion in nickel oxide have shown that doubly ionised cation vacancies and electron holes are the predominant defects in this material. The present work is an attempt to demonstrate that aliovalent impurities (Cr, Al, Na and Li) may considerably influence the concentration of these defects and, consequently, the oxidation rate of nickel at high temperatures. It has been shown that small amounts of tri-valent impurities (Cr, Al) bring about an increase of the oxidation rate, while mono-valent ones (Li, Na) decrease the rate of oxidation. These phenomena may satisfactorily be explained in terms of a doping effect. All experiments have been carried out as a function of temperature (1373-1673 K) and oxygen pressure (1-105 Pa) and consequently, it was possible to determine the influence of impurities not only on the oxidation rate but also on the activation energy of reaction and its pressure dependence. The results of these investigations could again be elucidated in terms of doping effect.

Sign in / Sign up

Export Citation Format

Share Document