Defects in the Bridgman grown lithium tetraborate of three-inch diameter

Author

Fan, Shi-ji ; Sun, Ren-Ying ; Wang, Jue

Author_Institution

Inst. of Ceramics, Acad. Sinica, Shanghai, China

fYear

1994

fDate

1-3 Jun 1994

Firstpage

78

Lastpage

84

Abstract

Defects in lithium tetraborate Li₂B₄O₇ (LBO) and their influence on performance of devices are concerned by crystal material researchers and device engineers with production of 3-inch diameter LBO crystal by the Bridgman (BR) technique and application and design of surface acoustic wave (SAW) devices fabricated on LBO substrate. The defects in the BR-grown LBO of 3-inch diameter are observed by chemical etching and microscopy. The main defects in the crystal are sub-grain boundaries and dislocations. Growth striation, scattering particle and twin occur in the crystal occasionally. The configuration of the defects, their origins and preventive methods are also described

Keywords

crystal defects; crystal growth from melt; dislocations; etching; inclusions; lithium compounds; optical microscopy; piezoelectric materials; subboundary structure; surface acoustic wave devices; 3 in; Bridgman technique; Li₂B₄O₇; SAW devices; chemical etching; defects; dislocations; growth striation; microscopy; performance of devices; scattering particle; sub-grain boundaries; surface acoustic wave devices; twin; Acoustic materials; Acoustic waves; Acoustical engineering; Chemicals; Crystalline materials; Design engineering; Lithium; Production; Surface acoustic wave devices; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 1994. 48th., Proceedings of the 1994 IEEE International

Conference_Location

Boston, MA

Print_ISBN

0-7803-1945-1

Type

conf

DOI

10.1109/FREQ.1994.398352

Filename

398352