一类新的有序菱叶石结构化合物

Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-07 DOI:10.1109/FREQ.2000.887346

B. Chai, A. Bustamante, M. Chou

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引用次数: 42

摘要

Langasite (LGS)及其异构体是少数具有独特温度补偿特性的压电晶体。但大多数已知的langasite结构化合物是无序的。无序导致更高的声损失和不均匀的力学性能。本文报道了一类阳离子完全有序的langasite异构体。它们是CNGS (Ca/sub 3/NbGa/sub 3/Si/sub 2/O/sub 14/)、CTGS (Ca/sub 3/TaGa/sub 3/Si/sub 2/O/sub 14/)、SNGS (Sr/sub 3/NbGa/sub 3/Si/sub 2/O/sub 14/)和STGS (Sr/sub 3/TaGa/sub 3/Si/sub 2/O/sub 14/)。它们都完全融化了。采用克氏熔体拉拔技术制备了高质量的单晶。它们具有低Ga/sub 2/O/sub 3/含量、高声速和低声损失等优点。

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A new class of ordered langasite structure compounds

Langasite (LGS) and its isomorphs are only a few piezoelectric crystals which have the unique temperature compensation property. But most of the known langasite structure compounds are disordered. Disorder causes higher acoustic losses and also nonuniform mechanical properties. We reported a new class of langasite isomorph which has all the cations totally ordered. They are CNGS (Ca/sub 3/NbGa/sub 3/Si/sub 2/O/sub 14/), CTGS (Ca/sub 3/TaGa/sub 3/Si/sub 2/O/sub 14/), SNGS (Sr/sub 3/NbGa/sub 3/Si/sub 2/O/sub 14/) and STGS (Sr/sub 3/TaGa/sub 3/Si/sub 2/O/sub 14/). They all melt congruently. High quality single crystals were produced by Czochralski melt pulling technique. They have the advantages of low Ga/sub 2/O/sub 3/ content, high acoustic velocity and low acoustic loss.

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Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)

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