Pressure dependence of viscosity and nuclear relaxation time in water and deuterium oxide

1974 ◽  
Vol 78 (16) ◽  
pp. 1674-1675 ◽  
Author(s):  
D. E. O'Reilly
Keyword(s):  
Relaxation Time ◽  
Pressure Dependence ◽  
Deuterium Oxide ◽  
Nuclear Relaxation

Nuclear relaxation time in mixed sodium salts

Physica ◽  
1963 ◽  
Vol 29 (1) ◽  
pp. 50-62 ◽  
Author(s):  
J. Grunzweig ◽  
D. Zamir ◽  
J. Zak
Keyword(s):  
Relaxation Time ◽  
Nuclear Relaxation ◽  
Sodium Salts

Differential Thermal Analysis and Dielectric Studies on Neopentanol under Pressure

1992 ◽  
Vol 47 (11) ◽  
pp. 1127-1134 ◽  
Author(s):  
H. G. Kreul ◽  
R. Waldinger ◽  
A. Würflinger
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Relaxation Time ◽  
Phase Transitions ◽  
Dielectric Relaxation ◽  
Pressure Dependence ◽  
Dielectric Relaxation Time ◽  
Dielectric Studies ◽  
Dielectric Measurements ◽  
Plastic Phase

Abstract Differential thermal analysis (DTA) and dielectric measurements have been performed on 2,2-dimethyl- 1-propanol (neopentanol) up to 200 MPa. Neopentanol exhibits at least one orientationally disordered (ODIC) phase (solid I) that transforms at lower temperatures to a non-plastic phase (solid II). There is evidence of a further ODIC phase denoted as solid I'. The pressure dependence of the phase transitions and the dielectric behaviour up to frequencies of 13 MHz are described. Activation enthalpies and volumes are derived from the dielectric relaxation time and compared with results for other alcohols

Pressure Dependence of Weak Acid Ionization in Deuterium Oxide Solutions

1998 ◽  
Vol 102 (6) ◽  
pp. 1002-1004 ◽  
Author(s):  
T. Kevin Hitchens ◽  
Robert G. Bryant
Keyword(s):  
Pressure Dependence ◽  
Deuterium Oxide ◽  
Weak Acid ◽  
Acid Ionization

Investigation of the Rotary Lattice Mode in R2PtCl6 Compounds. II. From a Study of the 35Cl Nuclear Quadrupolar Spin–Lattice Relaxation

1971 ◽  
Vol 49 (19) ◽  
pp. 2389-2395 ◽  
Author(s):  
Robin L. Armstrong ◽  
Douglas F. Cooke
Keyword(s):  
Relaxation Time ◽  
Pressure Dependence ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Published Data ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice ◽  
Lattice Mode ◽  
Temperature And Pressure

Measurements of the temperature and pressure variation of the 35Cl nuclear spin–lattice relaxation time in Rb2PtCl6 and Cs2PtCl6 are reported. The spin–lattice relaxation time is measured at atmospheric pressure for temperatures from 60 to 500 K and at four temperatures between 290 and 380 K for pressures to 5000 kg cm−2. Previously published data for K2PtCl6 are also included in the discussion. The Van Kranendonk theory of nuclear quadrupolar relaxation forms the basis of the analysis. The rotary lattice mode frequencies are deduced; they are of approximately the same magnitude and increase in the same sequence as the frequencies deduced from nuclear quadrupole resonance frequency measurements and from infrared and Raman data. An analysis of the pressure dependence of the spin–lattice relaxation time data yields order of magnitude pressure coefficients for the rotary mode frequencies. Finally, a thermodynamic analysis, which takes specific volume effects into account by incorporating both the temperature and pressure dependence of the data, is presented.

Pressure dependence of structural relaxation time in terms of the Adam-Gibbs model

2001 ◽  
Vol 63 (3) ◽  
Author(s):  
R. Casalini ◽  
S. Capaccioli ◽  
M. Lucchesi ◽  
P. A. Rolla ◽  
S. Corezzi
Keyword(s):  
Relaxation Time ◽  
Pressure Dependence ◽  
Structural Relaxation ◽  
Gibbs Model ◽  
Structural Relaxation Time

Etude des fluorures et oxyfluorures de chlore ClF5 et ClOF3 liquides par résonance magnétique nucléaire

1974 ◽  
Vol 52 (21) ◽  
pp. 3676-3681 ◽  
Author(s):  
Michel Alexandre ◽  
Paul Rigny
Keyword(s):  
Relaxation Time ◽  
Chemical Shift ◽  
Absorption Line ◽  
Line Shape ◽  
Nuclear Relaxation ◽  
Coupling Constant ◽  
Other Information ◽  
Résonance Magnétique ◽  
The Mean ◽  
Absorption Line Shape

Nuclear relaxation time measurements and interpretations of absorption line shape in ClF5 and ClOF3 allow one to complete data for these compounds. Thus, the chemical shift between non-equivalent fluorine atoms in ClOF3 has been found equal to 50 ± 2 p.p.m. The coupling constant, chlorine 35Cl–fluorine is 192 Hz for the axial fluorine, and less than 20 Hz for the equatorial fluorines. In addition to other information, such as exchange times between fluorine atoms in ClOF3, and the mean coupling constant chlorine–fluorine in ClOF3 and ClF3, is reported.

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