This article presents a study of special material properties of the single crystalline material Ca3TaGa3Si2O14 (CTGS = Catangasite). The comparatively highly ordered crystal structure and acceptable piezoelectric strength make it a candidate for microacoustic applications under extreme conditions. Obviously, low-loss dynamic behavior is typical for this crystal which consequently enables high-temperature use. As a particular challenge, the behavior at gigahertz frequencies is investigated here. For that, High overtone Bulk Acoustic wave Resonator (HBAR) type measurements in the range of 1-6 GHz are performed. The selection of five distinctive propagation directions for exclusively pure or quasi-longitudinal modes enables to derive the dynamic viscosities from the quality factors of HBAR results. The observed frequency dependences exhibit Akhiezer behavior as the predominant loss mechanism in the cases examined.

中文翻译：

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CTGS 单晶中的微波声衰减。

本文介绍了单晶材料 Ca3TaGa3Si2O14 (CTGS = Catangasite) 的特殊材料特性研究。相对高度有序的晶体结构和可接受的压电强度使其成为极端条件下微声应用的候选者。显然，这种晶体的低损耗动态行为是典型的，因此可以在高温下使用。作为一个特殊的挑战，这里研究了千兆赫频率下的行为。为此，执行 1-6 GHz 范围内的高泛音体声波谐振器 (HBAR) 类型的测量。为纯纯或准纵向模式选择五个不同的传播方向能够从 HBAR 结果的质量因素中推导出动态粘度。