Title :
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
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;
Conference_Titel :
Frequency Control Symposium, 1994. 48th., Proceedings of the 1994 IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-1945-1
DOI :
10.1109/FREQ.1994.398352
