An Explanation of the Influence of the Order-Disorder B2-B.C.C Transformation of the Self-Diffusion Behaviour in Alloys

1982 ◽  
Vol 21 ◽  
Author(s):  
H. Bakker
Keyword(s):  
Diffusion Coefficients ◽  
Isotope Effects ◽  
Tracer Diffusion ◽  
The Self ◽  
Disorder Transition ◽  
Self Diffusion ◽  
Kinetics Of ◽  
Diffusion Behaviour

ABSTRACTTheories describing the kinetics of ordered B2 and disordered b.c.c. alloys are applied to the effect of the order-disorder transition on tracer diffusion. Both tracer self-diffusion coefficients and isotope effects in βCuZn and equiatomic FeCo are considered.

scholarly journals Concentration dependence of intracrystalline self-diffusion in zeolites

1985 ◽  
Vol 2 (4) ◽  
pp. 229-239 ◽  
Author(s):  
H. Pfeifer ◽  
J. KÄRger ◽  
A. Germanus ◽  
W. Schirmer ◽  
M. BÜLow ◽  
...  
Keyword(s):  
Concentration Dependence ◽  
Diffusion Coefficients ◽  
Magnetic Relaxation ◽  
Co Adsorption ◽  
Molecular Transport ◽  
The Self ◽  
Self Diffusion ◽  
Gradient Technique ◽  
Zeolite Type ◽  
Diffusion Behaviour

The nmr pulsed field gradient technique is applied to study molecular self-diffusion in zeolitic adsorbate—adsorbent systems. Depending on the zeolite type and on the nature of the adsorbate—adsorbent interaction, the concentration dependence of the self-diffusion coefficients reveals considerable differences. Furthermore, intracrystalline molecular transport may be significantly influenced by the co-adsorption of a second molecular species. Supported by additional nuclear magnetic relaxation and sorption rate measurements microdynamic models for the observed diffusion behaviour are established.

Kinetics and Mechanism of MAg4I5 Formation in the Solid-State Reactions Between β-Agl and MI (M = K, Rb, NH4)

1975 ◽  
Vol 30 (6-7) ◽  
pp. 909-910
Author(s):  
Giorgio Flor ◽  
Vincenzo Massarotti ◽  
Riccardo Riccardi
Keyword(s):  
Solid State ◽  
Diffusion Coefficients ◽  
The Self ◽  
Solid State Reactions ◽  
Contact Method ◽  
Self Diffusion ◽  
Rate Determining Step ◽  
Kinetics Of ◽  
Wagner’S Theory ◽  
Counter Diffusion

Abstract The kinetics of MAg4I5 (M=K, Rb, NH4) formation from β-AgI and MI are investigated on pellets by the contact method. For all the three reactions involved, the governing mechanism is found to be the cation counter-diffusion while the rate-determining step is the diffusion of M+ . On the basis of Wagner's theory the self-diffusion coefficients of K+ , Rb+ and NH4+ are evaluated in the three compounds.

scholarly journals Self-Diffusion Coefficients, Aggregation Numbers and the Range of Existence of Spherical Micelles of Oxyethylated Alkylphenols

2021 ◽  
Author(s):  
Victor P. Arkhipov ◽  
Natalia A. Kuzina ◽  
Andrei Filippov
Keyword(s):  
Aqueous Solutions ◽  
Diffusion Coefficients ◽  
The Self ◽  
Self Diffusion ◽  
Aggregation Numbers ◽  
Temperature Ranges ◽  
Spherical Micelles ◽  
Limiting Values

AbstractAggregation numbers were calculated based on measurements of the self-diffusion coefficients, the effective hydrodynamic radii of micelles and aggregates of oxyethylated alkylphenols in aqueous solutions. On the assumption that the radii of spherical micelles are equal to the lengths of fully extended neonol molecules, the limiting values of aggregation numbers corresponding to spherically shaped neonol micelles were calculated. The concentration and temperature ranges under which spherical micelles of neonols are formed were determined.

Concentration dependence of the self-diffusion coefficients of water in electrolyte solutions

1974 ◽  
Vol 14 (6) ◽  
pp. 915-918
Author(s):  
A. M. Sazonov ◽  
V. M. Olevskii ◽  
A. B. Porai-Koshits ◽  
V. N. Skobolev ◽  
G. A. Shmuilovich
Keyword(s):  
Concentration Dependence ◽  
Diffusion Coefficients ◽  
Electrolyte Solutions ◽  
The Self ◽  
Self Diffusion

scholarly journals Investigation of the Self-Diffusion Coefficients of Trivalent Gd3+ in aqueous solutions: The Effect of Hydrolysis and nitrate ion association

2012 ◽  
Vol 1 (6) ◽  
pp. 334-346 ◽  
Author(s):  
Rafik Besbes ◽  
Noureddine Ouerfelli ◽  
Manef Abderabba ◽  
Patric Lindqvist-Reis ◽  
Habib Latrous
Keyword(s):  
Aqueous Solutions ◽  
Diffusion Coefficients ◽  
Ion Association ◽  
The Self ◽  
Nitrate Ion ◽  
Self Diffusion

Self-Diffusion of Sodium, Chloride and Iodide Ions in Methanol-Water Mixture

1986 ◽  
Vol 41 (7) ◽  
pp. 939-943 ◽  
Author(s):  
E. Hawlicka
Keyword(s):  
Sodium Chloride ◽  
Diffusion Coefficients ◽  
Solvent Composition ◽  
The Self ◽  
Water Mixture ◽  
Preferential Hydration ◽  
Water Solutions ◽  
Iodide Ions ◽  
Self Diffusion

The self-diffusion coefficients of Na+, Cl- and I- in methanol-water solutions at 35 ± 0.01 °C have been measured in their dependence on the salt molarity in the range 1 · 10-4- 1 · 10-2 mol dm -3. The ionic self-diffusion coefficients in infinitely diluted solutions have been computed. The influence of the solvent composition on the solvation of the ions is discussed. A preferential hydration of Na+, Cl- and I- ions in water-methanol mixtures has been found.

c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions

1994 ◽  
Vol 49 (3-4) ◽  
pp. 258-264 ◽  
Author(s):  
D. Girlich ◽  
H.-D. Lüdemann ◽  
C. Buttersack ◽  
K. Buchholz
Keyword(s):  
Field Gradient ◽  
Concentration Dependence ◽  
Diffusion Coefficients ◽  
The Self ◽  
Water Molecules ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion ◽  
Sucrose Solutions ◽  
Wide Range

The self diffusion coefficients D of the water molecules and of sucrose have been determined by the pulsed field gradient NMR technique over a wide range of temperatures and concentrations (cmax: 70% w/w suc.). All temperature dependencies can be fitted to a Vogel- Tammann-Fulcher equation. The isothermic concentration dependence of D for the sucrose is given by a simple exponential concentration dependence

Self-Diffusion in Molten Lithium Nitrate

1992 ◽  
Vol 47 (10) ◽  
pp. 1047-1050 ◽  
Author(s):  
C. Herdlicka ◽  
J. Richter ◽  
M. D. Zeidler
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Spin Echo ◽  
The Self ◽  
Lithium Nitrate ◽  
Equimolar Ratio ◽  
Self Diffusion ◽  
Field Gradients ◽  
Molten Lithium ◽  
Self Diffusion Coefficient

AbstractSelf-diffusion coefficients of 7Li+ ions have been measured in molten LiNO3 with several compositions of 6Li+ and 7Li+ over a temperature range from 537 to 615 K. The NMR spin-echo method with pulsed field gradients was applied. It was found that the self-diffusion coefficient depends on the isotopic composition and shows a maximum at equimolar ratio. At temperatures above 600 K this behaviour disappears.

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