Growth and piezoelectric properties of R3Ga5SiO 14 and RCa4O(BO3)3 (R: Rare-earth elements) single crystals

Hiroaki Takeda, Hiroshi Nakao, Shintaro Izukawa, Hiroyuki Shimizu, Takashi Nishida, Soichiro Okamura, Tadashi Shiosaki

Research output: Contribution to journalConference article

16 Citations (Scopus)


R3Ga5SiO14 (RGS, R: rare-earth elements) and RCa4O(BO3)3 (RCOB) single crystals were synthesized by the Czochralski technique and their piezoelectric properties were investigated. The piezoelectric moduli, d11 and d14, of La3Ga5SiO14 are higher than those of Nd 3Ga5SiO14. Moreover, in the RGS-type crystal, we found that the piezoelectric modulus, d11, increased with the lattice parameter a. The ionic size preferences of all cation sites in the RGS-type structure were also clarified. Based on these results, a new RGS-type Ba3TaGa3Si2O14 crystal was synthesized. We have successfully grown RCOB (R = La, Nd, Gd, Dy, and Y) single crystals with 1 and 2 in. diameter dimensions. The surface acoustic wave (SAW) properties of RCOB filters were investigated. In RCOB, the NdCOB single crystal showed the highest electromechanical coupling factors and lowest temperature coefficient of delay of the RCOB crystals.

Original languageEnglish
Pages (from-to)474-479
Number of pages6
JournalJournal of Alloys and Compounds
Publication statusPublished - 9 Feb 2006
EventProceedings of the Rare Earths'04 in Nara, Japan -
Duration: 7 Nov 200412 Nov 2004


  • Borate
  • Crystal growth
  • Gallate
  • Piezoelectricity
  • Rare-earth element

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