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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >SAW Parameters on Y-cut Langasite Structured Materials
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SAW Parameters on Y-cut Langasite Structured Materials

机译：Y切型菱形结构材料的声表面波参数

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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), Sr3TaGa3Si2O14 (STGS), Sr3NbGa3Si2O14 (SNGS), Ca3TaGa3Si2O14 (CTGS), and Ca3NbGa3Si2O14 (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 (> 1000degC). 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.
机译：本文介绍了几种用于表面声波（SAW）应用的新型人造压电单晶，直拉生长的衬底材料的结果和研究。这些材料，镧铁矿（LGN），硅酸盐（LGT），Sr3TaGa3Si2O14（STGS），Sr3NbGa3Si2O14（SNGS），Ca3TaGa3Si2O14（CTGS）和Ca3NbGa3Si2O14（CNGS）与硅藻土（LGS）晶体具有相同的结构，并且具有相同的结构作为石英。这些化合物比石英更致密，导致较低的相速度。它们还具有较高的耦合度。与石英和铌酸锂不同，在材料熔点以下不会降低材料性能，从而不会导致极端高温（> 1000℃）。本文总结了在六种材料的Y形切割衬底上各种传播角度提取的SAW材料参数。包括的参数是机电耦合，相速度，换能器电容，金属带反射率和频率温度系数。使用先前发布的基本材料常数，将提取的参数与LGT和LGN的预测值进行比较。此外，报告了在CTGS和CNGS Y切割基板上传播角在室温附近具有温度补偿的功率流角和分数频率曲率数据。给出了SAW参数提取技术的详细说明。提供了对结果的讨论，包括提取参数的比较和可能的SAW应用程序的概述。

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