Accession Number : ADA096375
Title : Single Crystal Substrates for Surface Acoustic Wave Devices.
Descriptive Note : Final technical rept. 1 Jan 79-30 Jun 80,
Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
Personal Author(s) : Barsch,G R ; Spear,K E
Report Date : Jan 1981
Pagination or Media Count : 63
Abstract : In order to search for new temperature compensated materials for surface acoustic wave (SAW) devices with low ultrasonic attenuation and high electromechanical coupling, the following experimental and theoretical investigations were carried out: (I) Crystal growth research centered around: designing, constructing, and writing the software for a computer controlled constant-diameter attachment for our Czochralski crystal pullers; a major experimental effort on the growth of lead potassium niobate (PKN); Pb2KNb5O15, and lead bismuth niobate (PBN) PbBi2Nb2O9, and a minor experimental effort on the growth of lithium metasilicate, Li2SiO3; and bismuth molybdate, Bi2MoO6. (II) The dielectric constants and the associated loss tangents of alpha-berlinite were measured at eleven frequencies from 100 to 10,000 Hz between -150 and 200 C. The temperature dependence of the dielectric constants and the relaxation behavior are similar to the results obtained earlier, but the absolute values are 20 to 30 percent smaller than reported previously. (III) The temperature dependence of the two shear modes propagating in (001) has been measured from 10 to 315K for Bi4Ti3O12. A monotonical decrease of the associated shear moduli has been found. (IV) Considerable effort was devoted to specimen preparation of lead bismuth niobate which was hampered by the easy cleavage of this material perpendicular to (001).
Descriptors : *SURFACE WAVES , *ACOUSTIC WAVES , *SINGLE CRYSTALS , *SUBSTRATES , TEMPERATURE , EXPERIMENTAL DATA , THEORY , ELECTROMECHANICAL DEVICES , PIEZOELECTRICITY , CONSTANTS , LEAD COMPOUNDS , TITANATES , CRYSTAL GROWTH , ELASTIC WAVES , POTASSIUM COMPOUNDS , ULTRASONIC RADIATION , MOLYBDATES , NIOBATES , BISMUTH COMPOUNDS
Subject Categories : Acoustics
Distribution Statement : APPROVED FOR PUBLIC RELEASE