Title :
Growth and properties of Φ3" ⟨011⟩ LBO crystal for leaky SAW devices
Author :
Fan, Shi-ji ; Xu, Jia-Yue ; Sun, Ren-ying ; Zhang, Guang-Yu
Author_Institution :
Inst. of Ceramics, Acad. Sinica, Shanghai, China
Abstract :
Φ3" ⟨011⟩ LBO crystals have been grown successfully by the modified Bridgman (BR) technique. The feature of ⟨011⟩ LBO growth is to form easily laminar twinning parallel to (100) face and ⟨011⟩ growth direction. The laminar twins can be increased in thickness and size of them or disappear from periphery of LBO boule. Twin-free Φ3" ⟨011⟩ LBO crystal can be grown by careful preparation of seed crystal and maintenance of stable growth conditions. (011) cut of BR-LBO substrate has phase velocity of longitudinal leaky surface acoustic wave (LLSAW) 6676 m/s, coupling coefficient k2 2.8%, propagation loss 0.0083 dB/λ, which indicates (011) cut of LBO substrate is suitable for high frequency device fabrication
Keywords :
acoustic wave absorption; acoustic wave propagation; crystal growth from melt; lithium compounds; surface acoustic wave devices; Li2B4O7; coupling coefficient; high frequency device fabrication; laminar twinning; leaky SAW devices; modified Bridgman technique; phase velocity; propagation loss; seed crystal; surface acoustic wave; Acoustic waves; Crystallography; Crystals; Fabrication; Frequency; Global Positioning System; Propagation losses; SAW filters; Shape; Surface acoustic wave devices;
Conference_Titel :
Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-3309-8
DOI :
10.1109/FREQ.1996.559829
