Temperature derivatives at constant volume of the elastic constants of the alkali halides |
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Authors: | Charles S Smith LS Cain |
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Institution: | Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514, U.S.A. |
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Abstract: | Values of dC/dT)V have been computed from experimental dC/dT)P and dC/dP)T for the three elastic constants (expressed as of each of the 16 Li, Na, K, and Rb halides. The dC/dT)V measure the explicit dependence of C on T, the effect of thermal expansion having been removed. The dC/dT)V are all small (compared with dC/dT)P), are all negative, and vary quite systematically and smoothly with anion, with cation and with the three elastic constants. Negative dBT/dT)V is accounted for both thermodynamically and by available lattice dynamical calculations. dC/dT)V for shear constant is expressed in terms of two vibrational mode parameters, whose values can then be estimated from the observed value, and the trend of dC/dT)V with Debye temperature. |
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