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Jpn. J. Appl. Phys. 42 (2003) pp. 6081-6085  |Next Article|  |Table of Contents|
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Growth and Characterization of Lanthanum Calcium Oxoborate LaCa4O(BO3)3 Single Crystals

Hiroaki Takeda, Hideki Sako, Hiroyuki Shimizu, Kaoru Kodama, Masahiro Nishida1, Hiroshi Nakao1, Takashi Nishida, Soichiro Okamura, Takashi Shikida1 and Tadashi Shiosaki

Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
1Research Development Division, Sakai Chemical Industry Co., Ltd., 5-1 Ebisujima-cho, Sakai, Osaka 590-0985, Japan

(Received June 16, 2003; accepted for publication July 9, 2003)

Lanthanum calcium oxoborate LaCa4O(BO3)3 (LaCOB) bulk single crystals were grown by the Czochralski technique. The crystals have almost constant transmittances between 320 and 2500 nm. The relationship between the growth habit and crystallographic abc - rectangular XYZ axes was clarified. Some dielectric and piezoelectric constants as well as elastic compliance constants of the LaCOB crystals were evaluated. The surface acoustic wave (SAW) and pseudo-SAW (PSAW) parameters of the LaCOB crystals were also measured. For the SAW, the largest electromechanical coupling coefficient of approximately 0.26% and a velocity of 3550 m/s were obtained for the YX orientation. For the PSAW, these parameters were approximately 0.6% and 4000 m/s for the ZY orientation.

URL: http://jjap.jsap.jp/link?JJAP/42/6081/
DOI: 10.1143/JJAP.42.6081


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