Optimal cuts of langasite, La3Ga5SiO14 for SAW devices

被引：65

作者：

Naumenko, N ^{[1
]}

Solie, L ^{[1
]}

机构：

[1] Moscow Steel & Alloys Inst, Crystal Phys dept, Moscow 117936, Russia

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2001年 / 48卷 / 02期

关键词：

Acoustic wave diffraction - Acoustic wave propagation - Acoustic wave velocity - Frequency response;

D O I：

10.1109/58.911736

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The results of a theoretical and experimental investigation of the SAW propagation characteristics in an optimal region of langasite defined by the Euler angles cp from -15 degrees to +10 degrees, theta from 120 degrees to 165 degrees, and psi from 20 degrees to 45 degrees are presented. Based on temperature coefficients of the elastic constants derived from experimental data, some optimal orientations of langasite characterized by high electromechanical coupling factor (k(2)), zero power flow angle (PFA) and low or zero temperature coefficient of frequency (TCF) were found. The SAW velocity in the region of interest is highly anisotropic; this results in a significant amount of diffraction, which must be taken into account in the search for orientations useful for SAW devices. An orientation having simultaneously zero PFA, zero TCF, negligible diffraction,, and relatively high piezoelectric coupling has been found and verified experimentally. The experimental results are in excellent agreement with the calculated SAW characteristics. The frequency response of a SAW device fabricated on the optimal cut of langasite is presented and demonstrates that high performance SAW Biters can be realized on this optimal cut of langasite.

引用

页码：530 / 537

页数：8

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