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    The temperature dependence of the absorption of 1.13 Gc/sec longitudinal sound waves in calcium fluoride

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    Author
    Breed, Benny Ray
    Date
    1964
    Advisor
    Donoho, Paul L.
    Degree
    Master of Arts
    Abstract
    The temperature dependent attenuation of 1.13 Gc/sec ultrasonic lattice waves has been measured in calcium fluoride. The attenuation was measured for longitudinal ultrasonic waves propagating in each of the three major crystallographic directions ([100], [110], [111]). It was found that the attenuation is relatively temperature-independent below 30°K and increases rapidly above this temperature until about 70°K where it is again temperature independent. The relative change in attenuation and the temperature at which the maximum attenuation was reached were different for the three crystallographic directions. These results are qualitatively the same as the results obtained by Bommel and Dransfeld in quartz. The theory of Woodruff and Ehrenreich has quantitatively explained the results in quartz. Their theory fits our data well using the approximate attenuation formula ... where Y is the GrUneisen constant, K is the thermal conductivity, is the sound wave frequency, pis the density, C is an average velocity of the thermal phonons, and ' is a mean thermal phonon relaxation time. In order to obtain the fit to our data for the three directions of propagation, it was necessary to assume 2 to 5 times greater than the values which would be obtained using the method used by Woodruff and Ehrenreich.
    Citation
    Breed, Benny Ray. "The temperature dependence of the absorption of 1.13 Gc/sec longitudinal sound waves in calcium fluoride." (1964) Master’s Thesis, Rice University. https://hdl.handle.net/1911/89844.
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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map