Title :
A typical defect in the Bridgman-grown LBO crystals
Author :
Fan, Shi-ji ; Sun, Ren-ying ; Xu, Jia-Yue ; Zhang, Guang-Yu ; Lin, Ya-fang
Author_Institution :
Inst. of Ceramics, Acad. Sinica, Shanghai, China
Abstract :
A typical macro-defect, a veil-like layer in the Bridgman-grown ⟨110⟩ LBO crystals, was discovered. The veil-like layer seems to be a semi-transparent veil which covers the whole or partial cross section in the growth direction. The mechanism for formation of the veil-like layer defect has been explored by determining morphology and distribution of the defect and analyzing the relationship between the crystal growth conditions and the defect. The veil-like layer defect is microcrack in which there is decomposition on surface of the crack or deposition of vapor of LBO melt in as-grown LBO crystals
Keywords :
acoustic materials; crystal defects; crystal growth from melt; lithium compounds; microcracks; piezoelectric materials; surface acoustic wave resonator filters; Bridgman-grown crystals; Li2B4O7; SAW devices; crack surface; crystal growth conditions; macro-defect; microcrack; partial cross section; piezoelectric materials; semi-transparent veil; veil-like layer; Crystalline materials; Crystals; Furnaces; Optical filters; Optical surface waves; Surface acoustic wave devices; Surface acoustic waves; Surface cracks; Surface morphology; Temperature control;
Conference_Titel :
Frequency Control Symposium, 1997., Proceedings of the 1997 IEEE International
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-3728-X
DOI :
10.1109/FREQ.1997.638655
