Specific Heat and Elastic Constants of Sodium Iodide at Low Temperatures

1960 ◽  
Vol 120 (2) ◽  
pp. 332-334 ◽  
Author(s):  
Richard N. Claytor ◽  
Billy J. Marshall
Keyword(s):  
Specific Heat ◽  
Elastic Constants ◽  
Low Temperatures ◽  
Sodium Iodide

scholarly journals Contributions to the theory of specific heat IV—On the calculation of the specific heat of crystals from elastic data

1935 ◽  
Vol 149 (866) ◽  
pp. 126-130 ◽  
Keyword(s):  
Specific Heat ◽  
Elastic Constants ◽  
General Problem ◽  
Elastic Waves ◽  
Low Temperatures ◽  
Equation Of Motion ◽  
Mean Value ◽  
Elastic Data ◽  
The Mean ◽  
The Waves

This paper contains a development of a method of calculating θ D values from elastic data (at low temperatures) originally given in Part II. 1—The general problem is that one is given the equation of motion of a continuum, and hence the velocity of the elastic waves as a function of the direction of the waves in a crystal and of the elastic constants; for specific heat purposes it is necessary to obtain from this equation the mean value of the velocity, and this is correlated fairly easily with the Debye θ D value.

Specific heat of ordered and isotopically disordered lattices

1978 ◽  
Vol 56 (10) ◽  
pp. 1390-1394
Author(s):  
K. P. Srivastava
Keyword(s):  
Specific Heat ◽  
Low Temperatures ◽  
Numerical Study ◽  
Three Dimensional ◽  
Constant Volume ◽  
Nearest Neighbour ◽  
Two Dimensional ◽  
Appreciable Difference ◽  
Substantial Change ◽  
Neighbour Interaction

An extensive numerical study on specific heat at constant volume (Cv) for ordered and isotopically disordered lattices has been made. Cv at various temperatures for ordered and disordered linear and two-dimensional lattices have been compared and no appreciable difference in Cv between these two structures has been observed. Effect of concentration of light atoms on Cv for three-dimensional isotopically disordered lattices has also been shown.In spite of taking next-nearest-neighbour interaction into account, no substantial change in Cv between the ordered and isotopically disordered linear lattices has been found. It is shown that the low lying modes contribute substantially at low temperatures.

Specific heat of the iron-hydrogen system at low temperatures

1979 ◽  
Vol 13 (7) ◽  
pp. 573-575 ◽  
Author(s):  
Hiroaki Wada ◽  
Koshiro Sakamoto
Keyword(s):  
Specific Heat ◽  
Low Temperatures ◽  
Hydrogen System

Specific heat of single crystal Ba0.6K0.4BiO3 at low temperatures

1996 ◽  
Vol 97 (3) ◽  
pp. 175-178 ◽  
Author(s):  
E.B. Nyeanchi ◽  
D.F. Brewer ◽  
T.E. Hargreaves ◽  
N.E. Hussey ◽  
A.L. Thomson ◽  
...  
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Low Temperatures

Specific Heat Anomalies of PtCo Alloys at Very Low Temperatures

1974 ◽  
pp. 520-524 ◽  
Author(s):  
P. Costa-Ribeiro ◽  
M. Saint-Paul ◽  
D. Thoulouze ◽  
R. Tournier
Keyword(s):  
Specific Heat ◽  
Low Temperatures

The thermal conductivity of Ni 2 + doped KMgF 3 in a magnetic field at low temperatures: the effect of single ions and coupled pairs

1970 ◽  
Vol 315 (1523) ◽  
pp. 551-568 ◽  
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Elastic Constants ◽  
Low Temperatures ◽  
Coupling Constants ◽  
Thermal Resistivity ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Average Spin ◽  
Lattice Coupling

The thermal conductivity between 0.4 and 4.2 K and in magnetic fields up to 50 kOe of KMgF 3 doped with Ni 2+ has been measured. The results are analysed to give values of the average spin-lattice coupling constants ( x Sl ) for the Ni 2+ ion. These are in agreement with values calculated using the magneto-elastic constants (GX1 and 6r44) derived from acoustic paramagnetic resonance (a.p.r.) experiments. Below IK the thermal resistivity as a function of magnetic field shows a number of anomalies, for which possible causes are discussed; it is concluded that they result from phonon interactions with exchange-coupled pairs of Ni 2+ ions. Such pairs are also observed in a.p.r. experiments.

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