Ultrasonic waves (shear or longitudinal) in the 10–30 mc range are transmitted down a fused silica rod, through a polystyrene or silicone one‐quarter wavelength seal, and into the solid specimen. Measurement of reflections within the specimen yields values for velocities of propagation and elastic constants.
Data obtained over a temperature range of 78° to 300°K for silicon and germanium single crystals, and 1.6° to 300°K for fused silica are listed. For the latter, a high loss is noted, with an indicated maximum near 30°K.
REFERENCES
1.
2.
3.
4.
5.
6.
Material made by Nieder Company and supplied by Amersil Company, Inc., Hillside, New Jersey. Rods were clear and essentially strain free. Refer also to reference 7.
7.
E. S.
Pennell
, “Vitreous silica for ultrasonic delay line applications
,” to be published in Proc. Natl. Electronics Conf.
Vol. 8
, 1952
.8.
Dow resin 276‐V9, Blend 288. For properties, refer to reference 9.
9.
10.
A description of measurements of this type is to be found in reference 11.
11.
Anderson Labs. Inc., “Interim report on solid supersonic delay lines,” Dec. 20, 1950 to March 30, 1951.
12.
13.
14.
Expansion data obtained by D. MacNair of Bell Telephone Laboratories.
15.
Roughening the surface by wet grinding with No. 600 Carborundum produced much stronger seals than a polished surface.
16.
This value was supplied by Eagle Picher Lead Company. A value of 5.329 was determined with x‐rays by W. L. Bond, Bell Telephone Laboratories. The 5.35 value used previously (reference 12) is apparently in error.
17.
M. E. Fine, “Dynamic methods for determining elastic constants and their temperature variation in metals,” American Society for Testing Materials, Symposium on Determination of Elastic Constants, June, 1952.
18.
M. E. Fine, “Elasticity and thermal expansion of germanium between −195 and +275°C”, submitted for publication in J. Appl. Phys.
19.
20.
Crystal provided by E. Buehler and oriented by J. Andrus Refer to reference 17 for method of growing.
21.
22.
23.
W. Roth, Quarterly Progress Report, M.I.T. Research Lab. of Electronics, Oct. 15, 1947.
24.
The “effective” length covered was probably slightly greater than 6 in. because of heat conduction within the rod.
25.
Dow Corning 200 Fluid, viscosity 25 000 poises.
26.
The mechanism of this relaxation process will be discussed in a forthcoming paper by O. L. Anderson and H. J. McSkimin.
27.
R. B. Sosman, The Properties of Silica (Chemical Catalog Company, Inc., New York, 1927) p. 361.
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© 1953 American Institute of Physics.
1953
American Institute of Physics
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