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FREQUENCY DEPENDENCE OF ULTRASONIC ATTENUATION IN ZINC OXIDE AT ROOM TEMPERATURE
1.D. L. White and W. C. Wang, Phys. Rev. 149, 628 (1966).
2.J. E. May, Jr., Proc. IEEE 53, 1465 (1965).
3.R. B. Hemphill, Appl. Phys. Letters 9, 35 (1966).
4.L. T. Claiborne, R. B. Hemphill, and N. G. Einspruch, J. Acoust. Soc. Am. 45, 1352 (1969).
5.Hydrothermally grown material obtained from Litton Industries; both crystals had a resistivity of about
6.C. F. Quate, C. D. W. Wilkinson, and D. C. Winslow, Proc. IEEE 53, 1604 (1965).
7.D. E. Caddes and C. D. W. Wilkinson, J. Acoust. Soc. Am. 40, 498 (1966).
8.Obtained from Barr and Stroud Ltd., calibration traceable to N. P. L. standards.
9.R. W. Dixon, IEEE J. Quantum Electron. QE‐3, 85 (1967).
10.This matter will be discussed further elsewhere.
11.W. T. Maloney and H. R. Charleton, IEEE Trans. Son. Ultrason. SU‐14, 135 (1967).
12.W. P. Mason, Ed., Physical Acoustics (Academic Press, New York, 1965), Vol. III‐B, Chap. 6.
13.E. P. Papadakis, J. Acoust. Soc. Am. 40, 863 (1966); for sample in Ref. 3, diffraction loss predicted by this author for longitudinal wave in ZnO propagating parallel to c axis is 0.1 dB/cm at 100 MHz; approximately 50% of measured value in Ref. 3.
14.L. G. Merkulov, Soviet Phys. Tech. Phys. 1, 59 (1956);
14.L. G. Merkulov, 2, 953 (1957)., Sov. Phys. Tech. Phys.
15.R. A. Wilson, H. J. Shaw, and D. K. Winslow, J. Appl. Phys. 36, 3269 (1965).
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