TY - JOUR
T1 - Shaped crystal growth of langasite-type piezoelectric single crystals and their physical properties
AU - Yokota, Yuui
AU - Yoshikawa, Akira
AU - Futami, Yoshisuke
AU - Sato, Masato
AU - Tota, Kazushige
AU - Onodera, Ko
AU - Yanagida, Takayuki
N1 - Funding Information:
manuscript received January 6, 2012; accepted may 6, 2012. This work was partially supported by Grant-in-aid for young scientists (b), 23750234 from the ministry of Education, culture, sports, science and Technology of the Japanese government. y. yokota, a. yoshikawa, and y. Futami are with the Institute for material research, Tohoku University, sendai, Japan (e-mail: yokota@ imr.tohoku.ac.jp). m. sato, K. Tota, and K. onodera are with TdK corp., nikaho, Japan. T. yanagida is with the new Industry creation Hatchery center (nIcHe), Tohoku University, sendai, Japan. doI http://dx.doi.org/10.1109/TUFFc.2012.2398
PY - 2012
Y1 - 2012
N2 - We have grown shape-controlled langasite-type crystals by the micro-pulling-down (μ-PD) method. Columnar shaped La 3Ta 0.5Ga 5.5O 14 (LTG), Ca 3NbGa 3Si 2O 14 (CNGS), Ca 3TaGa 3Si 2O 14 (CTGS), Sr 3NbGa 3Si 2O 14 (SNGS), and Sr 3Ta- Ga 3Si 2O 14 (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 d 11 of the CNGS crystal was 3.98 pC/N; this value is well correlated with those of previous reports.
AB - We have grown shape-controlled langasite-type crystals by the micro-pulling-down (μ-PD) method. Columnar shaped La 3Ta 0.5Ga 5.5O 14 (LTG), Ca 3NbGa 3Si 2O 14 (CNGS), Ca 3TaGa 3Si 2O 14 (CTGS), Sr 3NbGa 3Si 2O 14 (SNGS), and Sr 3Ta- Ga 3Si 2O 14 (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 d 11 of the CNGS crystal was 3.98 pC/N; this value is well correlated with those of previous reports.
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U2 - 10.1109/TUFFC.2012.2398
DO - 10.1109/TUFFC.2012.2398
M3 - Article
AN - SCOPUS:84866669532
VL - 59
SP - 1868
EP - 1871
JO - Transactions of the IRE Professional Group on Ultrasonic Engineering
JF - Transactions of the IRE Professional Group on Ultrasonic Engineering
SN - 0885-3010
IS - 9
M1 - 6306000
ER -