Growing Technology and Piezoelectric Studies of Langasite Single Crystal

• Main Authors: Teng Sung Chih, 鄧松治
• Other Authors: Hung Cheng Tsung
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/74850042962271554844

碩士 === 中華技術學院 === 電子工程研究所碩士班 === 96 === The Czochralski method was used to grow langasite crystal. Cooperating with VNIISIMS we set up the growing machine Kristall-3M for the single crystal growth of langasite. Langasite is utilized in the field of surface acoustic wave, body acoustic wave and tire pressure detector. Langasite is also a new type of piezoelectric single crystal material. Comparing with quartz, langasite has a higher electromechanical coupling coefficient k2, and a better stability of properties under different temperature. We have grown a langasite ingot with diameter of 3.5 cm, height 12.5 cm and weight of 540 grams. We also designed a langasite resonator W-235. Measureing with x-ray diffractometer, the result is consistent with the data of ICSD. The RAMAN measurement of langasite gave us different peak values, compared with other studies. The difference may be due to the accuration of crystal orientation, or the magnification and numerical aperture of Raman Spectroscopy.