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采用润湿导模技术生长出大块的片状铌酸锂单晶,尺寸可达200mm长、20mm宽、3mm厚。经测试,性能与柱状单晶相同。为了做好此项工作,我们测定了铌酸锂熔体的密度ρm与表面张力α等物理常数,得出在1270℃时ρm=3.57×103kg/m3,α=204dyne/cm;在1300℃时ρm=3.42×103kg/m3,α=192dyne/cm。Growth of lithium niobate large plate crystals was achieved by using the Wet-ted-Die Technique. Their dimensions were about 200 mm long, 20 mm in width and 3 mm thick. Their properties was found to be the same as those of cylindrical crystals. We measured the density ρm of the melt of lithium niobate and its surface tension a. The results are: ρm= 3.57×103kg/m3, α = 204 dyne/cm at 1270℃, and ρm= 3.42×103kg/m3, α = 192 dyne/cm at 1300℃.
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