SAW parameters on Y-cut langasite structured materials

    Authors

    D. Puccio; D. C. Malocha; N. Saldanha;M. P. da Cunha

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Ultrason. Ferroelectr. Freq. Control

    Keywords

    MATERIAL CONSTANTS; GROWTH; Acoustics; Engineering, Electrical & Electronic

    Abstract

    This paper presents results and investigations of several new, man-made piezoelectric: single crystal, Czochralski-grown substrate materials for surface acoustic waves (SAW) applications. These materials, langanite (LGN), langatate (LGT), Sr(3)TaGa(3)Si(2)O(14) (STGS), Sr(3)NbGa(3)Si(2)O(14) (SNGS), Ca(3)TaGa(3)Si(2)O(14) (CTGS), and Ca(3)NbGa(3)Si(2)O(14) (CNGS), have the same structure as langasite (LGS) and are of the, same crystal class as quartz. These compounds are denser than quartz, resulting in lower phase velocities. They also have higher coupling. Unlike quartz and lithium niobate, there is no degradation of material properties below the material melting, points resulting in the possibility of extreme high-temperature operation ( > 1000 degrees C). This paper gives a summary of extracted SAW material parameters for various propagation angles on Y-cut substrates of the six materials. Parameters included are electromechanical coupling, phase velocity, transducer capacitance, metal strip reflectivity, and temperature coefficient of frequency. Using previously published fundamental material constants, extracted parameters are compared with predictions for LGT and LGN. In addition, power flow angle and fractional frequency curvature data are reported for propagation angles on CTGS and CNGS Y-cut substrates that exhibit temperature compensation near room temperature. Detailed descriptions of the SAW parameter extraction techniques are given. A discussion of the results is provided, including a comparison of extracted parameters and an overview of possible SAW applications.

    Journal Title

    Ieee Transactions on Ultrasonics Ferroelectrics and Frequency Control

    Volume

    54

    Issue/Number

    9

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    1873

    Last Page

    1881

    WOS Identifier

    WOS:000249508300018

    ISSN

    0885-3010

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