Experimental Determination of the Low-Temperature Grüneisen Parameter of Silicon from Pressure Derivatives of Elastic Constants

1970 ◽  
Vol 1 (4) ◽  
pp. 1548-1551 ◽  
Author(s):  
A. G. Beattie ◽  
J. E. Schirber
Keyword(s):  
Low Temperature ◽  
Experimental Determination ◽  
Elastic Constants ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Derivatives Of

Low temperature Grüneisen parameter of cubic ionic crystals

1987 ◽  
Vol 43 (3) ◽  
pp. 399-411 ◽  
Author(s):  
Alicia Batana ◽  
María C. Monard ◽  
María Rosario Soriano
Keyword(s):  
Low Temperature ◽  
Ionic Crystals ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter

The experimental determination of hydromagnesite precipitation rates at 22.5–75ºC

2014 ◽  
Vol 78 (6) ◽  
pp. 1405-1416 ◽  
Author(s):  
U.-N. Berninger ◽  
G. Jordan ◽  
J. Schott ◽  
E. H. Oelkers
Keyword(s):  
Low Temperature ◽  
Experimental Determination ◽  
Closed System ◽  
Equilibrium Constants ◽  
Magnesium Silicate ◽  
Silicate Mineral ◽  
Dissolution Rates ◽  
Dissolution And Precipitation

Natural hydromagnesite (Mg5(CO3)4(OH)2·4H2O) dissolution and precipitation experiments were performed in closed-system reactors as a function of temperature from 22.5 to 75ºC and at 8.6 < pH < 10.7. The equilibrium constants for the reaction Mg5(CO3)4(OH)2·4H2O + 6H+ = 5Mg2+ + 4HCO3– + 6H2O were determined by bracketing the final fluid compositions obtained from the dissolution and precipitation experiments. The resulting constants were found to be 1033.7±0.9, 1030.5±0.5 and 1026.5±0.5 at 22.5, 50 and 75ºC, respectively. Whereas dissolution rates were too fast to be determined from the experiments, precipitation rates were slower and quantified. The resulting BET surface areanormalized hydromagnesite precipitation rates increase by a factor of ~2 with pH decreasing from 10.7 to 8.6. Measured rates are approximately two orders of magnitude faster than corresponding forsterite dissolution rates, suggesting that the overall rates of the low-temperature carbonation of olivine are controlled by the relatively sluggish dissolution of the magnesium silicate mineral.

Experimental Determination of the Equilibrium Water Content of CO2 at High Pressure and Low Temperature

2015 ◽  
Vol 60 (9) ◽  
pp. 2674-2683 ◽  
Author(s):  
Louis V. Jasperson ◽  
Jeong Won Kang ◽  
Chul Soo Lee ◽  
Don Macklin ◽  
Paul M. Mathias ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Experimental Determination ◽  
Water Content ◽  
Equilibrium Water Content

scholarly journals Preparation, structure, and conformation in solution of diacetyl derivatives of 6,7-dimethyl-1,4-dihydroquinoxaline and of dihydropyridotriazines

1985 ◽  
Vol 63 (11) ◽  
pp. 3210-3215 ◽  
Author(s):  
Joseph Armand ◽  
Line Boulares ◽  
Marie-Paule Simonnin ◽  
Christian Bellec ◽  
Odile Convert ◽  
...  
Keyword(s):  
Low Temperature ◽  
Conformational Study ◽  
Derivatives Of

A conformational study of 1,4-diacetyl-1,4-dihydro-6,7-dimethylquinoxaline is carried out by low temperature nmr in CD2Cl2. Important acetyl rotation induced shifts have been observed for the peri and ortho protons. These results, together with low temperature nOe experiments, permit the determination of the structures and conformations of four diacetyl derivatives of dihydropyrido[3,4-e] as-triazines and of one diacetyl derivative of a dihydropyrido[4,3-e] as-triazine.

scholarly journals Volume derivatives of the Grüneisen parameter in the limit of infinite pressure

2019 ◽  
Vol 97 (1) ◽  
pp. 114-116 ◽  
Author(s):  
A. Dwivedi
Keyword(s):  
Boundary Condition ◽  
Fourth Order ◽  
Fundamental Theorem ◽  
High Pressures ◽  
Grüneisen Parameter ◽  
Third Order ◽  
Gruneisen Parameter ◽  
The Third ◽  
Properties Of Materials ◽  
Derivatives Of

Expressions have been obtained for the volume derivatives of the Grüneisen parameter, which is directly related to the thermal and elastic properties of materials at high temperatures and high pressures. The higher order Grüneisen parameters are expressed in terms of the volume derivatives, and evaluated in the limit of infinite pressure. The results, that at extreme compression the third-order Grüneisen parameter remains finite and the fourth-order Grüneisen parameter tends to zero, have been used to derive a fundamental theorem according to which the volume derivatives of the Grüneisen parameter of different orders, all become zero in the limit of infinite pressure. However, the ratios of these derivatives remain finite at extreme compression. The formula due to Al’tshuler and used by Dorogokupets and Oganov for interpolating the Grüneisen parameter at intermediate compressions has been found to satisfy the boundary condition at infinite pressure obtained in the present study.

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