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报道了化学计量比LiNbO3(stoichiometriclithiumniobate ,SLN)晶体的坩埚下降法生长。采用一致融熔成分铌酸锂籽晶 ,以K2 O为助熔剂 ,在自制的坩埚下降炉内生长SLN晶体。最高炉温控制在 13 0 0℃附近 ,固液界面处的纵向温度梯度为 40～ 60℃ /cm ,坩埚下降速率小于5mm/d ,在密闭的铂坩埚中 ,成功地生长出尺寸为2 5mm× 40mm的近化学计量比铌酸锂单晶。测得晶体的Curie温度为 190℃ ,利用有关公式计算出所得晶体的n(Li) /n(Li+Nb)为 0 .495 6,研究了熔体的析晶行为及晶体的宏观缺陷。
Reported the stoichiometric LiNbO3 (stoichiometriclithium niobate, SLN) crystal crucible growth method. The uniform melting composition of lithium niobate seed, with K2O as a flux, SLN crystals grown in a homemade crucible down furnace. The maximum furnace temperature is controlled at around 1300 ℃. The longitudinal temperature gradient at the solid-liquid interface is 40 ~ 60 ℃ / cm and the rate of crucible drop is less than 5mm / d. In the closed platinum crucible, the size of 尺2 Near stoichiometric lithium niobate single crystals of 5 mm x 40 mm. The measured Curie temperature is 190 ℃. The crystallinity and the macroscopic defects of the melt were studied by using the formula to calculate the n (Li) / n (Li + Nb) of the obtained crystal.