Pressure derivatives of the elastic moduli of strontium,barium and lead nitrate |
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| Authors: | D Gerlich Marcel Wolf S Haussühl |
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| Institution: | Department of Physics and Astronomy, Tel Aviv University, Ramat Aviv, Israel;Institut für Kristallographie, Universität zu Köln, D-5000 Köln 41, West Germany |
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| Abstract: | The pressure derivatives of the elastic moduli of Sr(NO3)2, Ba(NO3)2 and Pb(NO3)2 single crystal, have been measured by the ultrasonic pulse superposition method. The results for Sr(NO3)2 and Pb(NO3)2 are similar in magnitude and character, while the ones for Ba(NO3)2 differ strongly, and even From the measured pressure derivatives, the mode Grüneisen gammas and the Grüneisen constant as a function of temperature have been determined, and the latter is correlated with the experimental values, deduced from thermal expansion. The explicit temperature dependence of the elastic moduli is calculated, and found to be always negative, increasing in absolute value from Sr(NO3)2 to Pb(NO3)2. |
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