Shaped crystal growth of langasite-type piezoelectric single crystals and their physical properties
Shaped crystal growth of langasite-type piezoelectric single crystals and their physical properties
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DOI：
10.1109/tuffc.2012.2398
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
Y. Yokota;A. Yoshikawa;Y. Futami;Masato Sato;K. Tota;K. Onodera;T. Yanagida
中科院分区：
文献类型：
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作者：
Y. Yokota;A. Yoshikawa;Y. Futami;Masato Sato;K. Tota;K. Onodera;T. Yanagida
我们用微下拉法生长了形状可控的硅酸钾型晶体。使用底部具有3 mm直径的柱状模具的Pt-Rh坩埚生长柱状La 3 Ta 0.5Ga 5.5O 14（LTG）、Ca 3 NbGa 3Si 2 O 14（CNGS）、Ca 3 TaGa 3Si 2 O 14（CTGS）、Sr 3 NbGa 3Si 2 O 14（SNGS）和Sr 3 TaGa 3Si 2 O 14（STGS）晶体。所有生长的晶体表现出高的透明度，除了周边区域和直径约3毫米。在生长的晶体的中心部分的化学相被确定为一个单一的相硅酸镧类型的结构和它们的晶格参数几乎相同的晶体生长的直拉法（Cz）的方法，但是，在周边区域观察到一些杂质相。在X-射线摇摆曲线测量中，生长的晶体表示与通过Cz方法生长的晶体相等的结晶度。的CNGS晶体的压电常数d11为3.98 pC/N，这个值是很好的相关性与以前的报告。
We have grown shape-controlled langasite-type crystals by the micro-pulling-down (μ-PD) method. Columnar shaped La3Ta0.5Ga5.5O14 (LTG), Ca3NbGa3Si2O14 (CNGS), Ca3TaGa3Si2O14 (CTGS), Sr3NbGa3Si2O14 (SNGS), and Sr3TaGa3Si2O14 (STGS) crystals were grown using a Pt-Rh crucible with a 3-mm-diameter columnar die at the bottom. All grown crystals showed high transparency except for the peripheral area and diameter of approximately 3 mm. The chemical phases at the central parts of the grown crystals were identified as a single phase of langasite-type structure and their lattice parameters were almost the same as those of crystals grown by the Czochralski (Cz) method; however, some impurity phases were observed in the peripheral area. In X-ray rocking curve measurements, the grown crystals indicated equivalent crystallinity to the crystal grown by the Cz method. The piezoelectric constant d11 of the CNGS crystal was 3.98 pC/N; this value is well correlated with those of previous reports.