The reduced dynamic (absolute) and kinematic viscosities of the metals—mercury, sodium and potassium—over their entire liquid range, i.e., from the melting point to the critical point, and a comparison with van der Waals' substances

1965 ◽  
Vol 27 (5) ◽  
pp. 979-987 ◽  
Author(s):  
A.V. Grosse
Keyword(s):  
Melting Point ◽  
Critical Point ◽  
Van Der Waals ◽  
Sodium And Potassium ◽  
Reduced Dynamic

Two-dimensional C3N/blue phosphorene vdW heterostructure for Li, Na and K-ion batteries

2021 ◽  
Author(s):  
Mohammad Ubaid ◽  
Anver Aziz ◽  
Bhalchandra S. Pujari
Keyword(s):  
Van Der Waals ◽  
Potassium Ion ◽  
Two Dimensional ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure ◽  
Sodium And Potassium ◽  
Blue Phosphorene

We investigate a van der Waals heterostructure constructed using BP and C3N and investigate its use as an anode for lithium-, sodium- and potassium-ion batteries.

Critical Point of Metals from the van der Waals Model

1971 ◽  
Vol 3 (1) ◽  
pp. 364-371 ◽  
Author(s):  
David A. Young ◽  
Berni J. Alder
Keyword(s):  
Critical Point ◽  
Van Der Waals ◽  
Van Der Waals Model

scholarly journals The emission of electrons under the influence of chemical action

1931 ◽  
Vol 132 (819) ◽  
pp. 22-50 ◽  
Keyword(s):  
Melting Point ◽  
Energy Distribution ◽  
Liquid Alloy ◽  
Contact Potential Difference ◽  
Potential Difference ◽  
Contact Potential ◽  
Chemical Action ◽  
Upper Limits ◽  
Low Pressures ◽  
Sodium And Potassium

The present investigation is a continuation of the researches on the emission of electrons under the influence of chemical action listed in the footnote. In the remainder of this paper these publications will be referred to by the numbers assigned to them in this list. All the experiments to be described were made with a liquid alloy of the composition NaK 2 , which has the lowest melting point of all the alloys of sodium and potassium, under the action of phosgene gas (COCi 2 ). At the beginning the pre-existing situation was carefully reviewed. It was felt that the most important point was to determine the energy distribution of the emitted electrons at pressures of COCl 2 less than 10 -4 mm. with as much accuracy and down to as low pressures as possible. In (6) it had only been found possible to make rough estimates of this energy distribution owing to troublesome variations in the contact potential difference between the electrodes which it was impossible to control. Another unsatisfactory feature of (6) was the “clean-up” effect of the alloy on the reacting gas. This made the real values of the pressures very uncertain, particularly at the lower pressures, so much so that the values were only given in the paper as upper limits.

THE VAN DER WAALS INTERACTION BETWEEN ALKALI MICROCLUSTERS

1993 ◽  
Vol 07 (09) ◽  
pp. 573-590 ◽  
Author(s):  
J. M. PACHECO ◽  
W. EKARDT
Keyword(s):  
Density Functional ◽  
Local Density ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Functional Theory ◽  
Quantum Size ◽  
Valence Electrons ◽  
Sodium And Potassium ◽  
Neutral Sodium

The nonretarded van der Waals coefficients C6 and C8 are determined for all pairs of neutral sodium and potassium microclusters with 1, 2, 8 and 20 atoms. The spherical jellium approximation is used to replace their ionic cores, and the valence electrons are treated in the local density approximation of density functional theory. The dynamical polarizabilities of these systems are computed making use of three different methods, two microscopic and quantum mechanical linear response formulations and one classical. It is found that quantum size effects, in particular Landau fragmentation, play a crucial role in the determination of these coefficients. Furthermore, we find that self-interaction errors present in standard microscopic approximations lead to sizeable effects in the strength of the van der Waals coefficients. On the other hand, we find that the vibrational temperature of these clusters has a very small effect in the van der Waals interaction which can be disregarded within the range of temperatures presently reachable experimentally.

scholarly journals A new formation of diamond

1905 ◽  
Vol 76 (512) ◽  
pp. 458-461 ◽  
Keyword(s):  
Critical Temperature ◽  
Melting Point ◽  
Critical Point ◽  
Boiling Point ◽  
Critical Pressure ◽  
Carbonic Acid ◽  
Melting Points ◽  
Boiling Points ◽  
James Dewar ◽  
New Formation

On the average the critical point of a substance is 1·5 times its absolute boiling-point. Therefore the critical point of carbon should be about 5800° Ab. But the absolute critical temperature divided by the critical pressure is for all the elements so far examined never less than 2·5; this being about the value Sir James Dewar finds for hydrogen. So that, accepting this, we get the maximum critical pressure as follows, viz., 2320 atmospheres:— 5800° Ab./CrP = 2·5, or CrP = 5800° Ab./2·5, or 2320 atmospheres. Carbon and arsenic are the only two elements that have melting-point above the boiling-point; and among compounds carbonic acid and fluoride of silicium are the only other bodies with similar properties. Now the melting-point of arsenic is about 1·2 times its absolute boiling-point. With carbonic acid and fluoride of silicium the melting-points are about 1·1 times their boiling-points. Applying these ratios to carbon we find that its melting-point would be about 4400°.

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