Thermal and Ultrasonic Transport Properties of Dielectric and Piezoelectric Solids.
Final rept. 15 Nov 73-14 Nov 76,
CONNECTICUT UNIV STORRS
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This final report describes measurements of the thermal conductivity of single crystal alumina from 1 to 70 K and the effect of electron irradiation, and of the thermal conductivity and ultrasonic attenuation of lithium niobate. Point defect scattering of phonons was also studied through lattice thermal conductivity of copper-germanium. Theory of thermal conductivity of crystals at high temperatures was extended in terms of four-phonon processes, optical modes and thermal expansion. A surface wave transducer can be made by periodically modulating a piezoelectric surface attempts to make such a device are described. Author
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