Title

SAW parameters on Y-cut langasite structured materials

Authors

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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