New precision measurements have been made of the pressure dependence of the elastic constants of MgO single crystals by using the ultrasonic pulse superposition method in connection with an automatic peak finder. The results for the first pressure derivatives of the elastic constants lie mostly between the earlier data of Bogardus and the data of Anderson and Andreatch and essentially agree, within the joint experimental error, with both sets of values.
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Chang et al. (1969) studied this question.
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