Accession Number : AD0475404

Title :   ATTENUATION MEASUREMENTS OF ULTRASONIC WAVES IN MANGANESE FLUORIDE IN THE REGION OF THE NEEL TEMPERATURE.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Morse, Carl S. ; Oliver, Philip, Jr.

Report Date : 1965

Pagination or Media Count : 22

Abstract : Measurements of the attenuation of ultrasonic waves in MnF2 were made in region of the Neel temperature (67.336 K). Longitudinal waves were propagated at 25.7 Mc and 35.8 Mc along the c-axis, and at 26.2 Mc and 37.2 Mc along the (110) direction. The attenuation peaked at 67.204 K at 35.8 Mc and at 67.206 K at 25.7 Mc for propagation along the c-axis, and at 67.080 K at 37.2 Mc and at 67.128 K at 26.2 Mc in the (110) direction. Shear waves were propagated at 12.5 Mc and 33.6 Mc along the c-axis, and parallel to the a-axis. No attenuation peak was observed for the shear wave. In both longitudinal and shear waves the attenuation increased with increasing frequency. (Author)

Descriptors :   (*ULTRASONIC RADIATION, ATTENUATION), MANGANESE COMPOUNDS, FLUORIDES, CRYOGENICS, HIGH FREQUENCY, VERY HIGH FREQUENCY, CRYSTALS, MEASUREMENT, TEMPERATURE.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE