公开(公告)号：US10793968B2

公开(公告)日：2020-10-06

申请号：US15753438

申请日：2016-08-18

申请人： CITIZEN FINEDEVICE CO., LTD. ,  CITIZEN WATCH CO., LTD.

发明人： Ikuo Takahashi ,  Takayuki Aoki ,  Youichi Nonogaki ,  Yoshitaka Kinoshita

IPC分类号： C30B15/00 ,  C30B15/10 ,  C30B29/30

摘要： A method of production of a high insulation resistance, high strength langatate-based single crystal and a langatate-based single crystal are provided. That is, a method of production of a langatate-based single crystal using the Czochralski method of pulling up a crystal from a starting material solution so as to grow a langatate-based single crystal, comprising placing the starting material solution of the single crystal in a platinum crucible and growing the single crystal using the Z-axis as the growth axis in a growth atmosphere of a mixed gas comprising an inert gas in which an oxidizing gas is contained in an amount greater than 5 vol %.

公开(公告)号：US10648868B2

公开(公告)日：2020-05-12

申请号：US15539157

申请日：2015-12-24

申请人： CITIZEN WATCH CO., LTD.

发明人： Youichi Nonogaki ,  Yoshitaka Kinoshita ,  Takashi Akahane ,  Satoshi Sohda

IPC分类号： G01K11/26 ,  H03H9/02 ,  G01K7/32 ,  H03H9/25 ,  H01L41/107 ,  H01L41/18 ,  H03H9/64 ,  H01L41/41

摘要： Provided is a surface acoustic wave device using a novel and steadily suppliable piezoelectric material that is resistant to a high-temperature environment and enables the surface acoustic wave device to use a 2 GHz to 2.5 GHz band or higher. The surface acoustic wave device includes: a piezoelectric substrate formed from a monocrystal of gehlenite (CAS: Ca2Al(AlSi)O7); and interdigital transducers formed on a surface acoustic wave propagation plane of the piezoelectric substrate.