Thermal Expansion of Alkali Halides at Low Temperatures

1968 ◽  
Vol 167 (3) ◽  
pp. 814-817 ◽  
Author(s):  
T. H. K. Barron ◽  
Alicia Batana
Keyword(s):  
Thermal Expansion ◽  
Low Temperatures ◽  
Alkali Halides

THE THERMAL EXPANSION OF ALKALI HALIDES

1965 ◽  
Vol 43 (10) ◽  
pp. 1853-1866 ◽  
Author(s):  
P. P. M. Meincke ◽  
G. M. Graham
Keyword(s):  
Thermal Expansion ◽  
Low Temperatures ◽  
Linear Thermal Expansion ◽  
Alkali Halides ◽  
Temperature Limit ◽  
Detectable Change ◽  
Fabry Perot ◽  
Interionic Potential ◽  
Best Fit ◽  
Rigid Ion Model

Measurements have been made of the coefficient of linear thermal expansion of NaCl, Nal, KCl, and KBr over the temperature range from 7 °K to 300 °K. The measurements were made by monitoring the changes in length of a Fabry–Perot etalon, whose spacer was of the material being studied, as it slowly warmed from liquid-helium temperatures. The detectable change in length of the 2-in. specimen was about 2 Å. The results are analyzed by reducing them to values of the Grueneisen γ. The temperature variation of γ at high temperatures is used to obtain values of γ (2s), which are compared with new calculations on a rigid-ion model to give the best fit to the Born exponent for the non-Coulomb interionic potential. The data for low temperatures are not sufficiently accurate to justify detailed analysis; there is some indication that the apparent low-temperature limit of γ is, in fact, the value at a minimum.

scholarly journals Thermal Properties of Stabilized Zirconia at Low Temperatures

1985 ◽  
Vol 38 (4) ◽  
pp. 617 ◽  
Author(s):  
JG Collins ◽  
SJ Collocott ◽  
GK White
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Low Temperatures ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Stabilized Zirconia ◽  
Elastic Data

The linear thermal expansion coefficient a from 2 to 100 K and heat capacity per gram cp from 0�3 to 30 K are reported for fully-stabilized zirconia containing a nominal 16 wt.% (9 mol.%) of yttria. The heat capacity below 7 K has been analysed into a linear (tunnelling?) term, a Schottky term centred at 1�2 K, a Debye term (e~ = 540 K), and a small T5 contribution. The expansion coefficient is roughly proportional to T from 5 to 20 K and gives a limiting lattice Griineisen parameter 'Yo ::::: 5, which agrees with that calculated from elastic data.

The relationship between crystal ionicity and some physical properties of the alkali halides

1975 ◽  
Vol 142 (3-4) ◽  
Author(s):  
Sergio Deganello
Keyword(s):  
Thermal Expansion ◽  
Potential Energy ◽  
Physical Properties ◽  
Linear Dependence ◽  
Alkali Halides ◽  
Quantitative Prediction ◽  
Interatomic Distances ◽  
Crystal Properties ◽  
Thermal Vibrations ◽  
The Relationship

AbstractIn the alkali halides a linear dependence is found between the values of crystal ionicity, spectroscopically determined, and crystal properties such as interatomic distances, potential energy and amplitudes of atomic vibration. Such a correlation appears to allow a quantitative prediction of coefficients of thermal expansion and amplitudes of thermal vibrations of the atoms.

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