The elastic constants of sodium chloride and rubidium chloride in the range 140-300 K

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Abstract
Measurements of the adiabatic elastic constants of NaCl from 190 to 300 K and of RbCl from 140 to 300 K have been made using the `sing-around' system to an absolute accuracy of ±0·2% and with a relative accuracy of ±0·05%. The elastic constants of NaCl agree with other recent measurements. The measurements of the elastic constants of RbCl agree with other work forC11andC44but the variation ofC12with temperature disagrees with the other measurements. The decrease inC12of RbCl with decreasing temperature is in accordance with the variation ofC12in other alkali chlorides. The reasons for the disagreement of the variation ofC12are examined and it is shown that the observed decrease is real.