The Research of the LGS CrystalManufacturing Process

• Main Authors: 無, 陳宜平
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/00913077169444650991

碩士 === 中華技術學院 === 電子工程研究所碩士班 === 96 === The Langasite is a new piezoelectric material,the molecular formula is La3 Ga5 SiO14 and the brief name is called LGS,the Chinese name is called Lan Ke Sai,At the 1980's, Russia was already to study the LGS,base on their research reports ,its sound wave characteristic compare to quartz,LiNbO3 and LiTaO3 are very likely. In the research activate,it is discovered that the quartz changes phase at 573℃, but the LGS in the high temperature is not changed when temperature is 1470℃, The LGS also has the good stability and electromechanical coupling coefficients,it can use for the sound wave component(SAW,BAW). This paper adopts the Czochralski Method,it is succeed to produce the first single crystal of Langasite in Taiwan,It is also the first single crystal of Langasite for academic field.Due to Taiwan’s industry is not development this technology,it has the following causes,1. The growth environments,2.The demand of germanium is very big,and rather expensive,3. Requirements of industry field.Because Russia,the USA, and Japan already adopt LGS to implement device,but our industry field have no such development.This paper will research and develop the LGS relation technology and produce the raw material by ourselves in ROC Taiwan,May it can produce a high performance and low cost crystal of LGS,it will also contribute to our industry upgrade.