R.J. Von Gutfeld, A.H. Nethercot Jr.
Physical Review Letters
Results of heat-pulse measurements between 4 and 54°K are reported for sapphire and show that the propagation is ballistic below 18°K and diffusive above 40°K. In the intermediate range, the propagation is a superposition of the two. © 1966 The American Physical Society.
R.J. Von Gutfeld, A.H. Nethercot Jr.
Physical Review Letters
R.J. Von Gutfeld, H.L. Caswell
Applied Physics Letters
D.M. Newns, T. Doderer, et al.
Journal of Electroceramics
R.J. Von Gutfeld
Optics and Laser Technology