Accession Number : AD0859536

Title :   Microwave Acoustical Loss Mechanisms in Crystals.

Descriptive Note : Final rept. 1 Oct 67-30 Apr 69,

Corporate Author : SPERRY RAND RESEARCH CENTER SUDBURY MA

Personal Author(s) : Smith, Alan B. ; Croft, William J. ; Damon, Richard W. ; Kedzie, Robert W. ; Kestigian, Michael

Report Date : JUL 1969

Pagination or Media Count : 103

Abstract : The utilization of microwave devices at high frequencies depends on the availability of materials with low acoustic loss. In order to extend the present frequency range of these devices, new materials with lower losses are desirable. The study was undertaken in an effort to gain a better understanding of the mechanisms responsible for acoustic attention and thus to develop improved materials. Large high-quality crystals of YAG, gallium-doped YAG, Nb and Lu doped YAG, LiNbO3, and LiTaO3 were grown; and the attenuation of these materials was measured.

Descriptors :   *ULTRASONIC PROPERTIES), (*CRYSTAL GROWTH, SINGLE CRYSTALS), (*SINGLE CRYSTALS, RARE EARTH ELEMENTS, CRYSTAL STRUCTURE, MICROWAVE EQUIPMENT, ATTENTION, DOPING, THERMAL PROPERTIES, X BAND, GARNET, YTTRIUM COMPOUNDS, LITHIUM COMPOUNDS, MAGNESIUM OXIDES.

Subject Categories : Acoustics
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE