Abstract
This chapter discusses the growth characteristics of LiTaO3(LT) single crystals using the halogen floating zone method and characterizations of the grown crystals. Calcination and sintering parameters were established. Optimum crystal growth conditions were investigated by a controlling of growth rates, rotation speeds, and atmospheres. LiTaO3 single crystals with a diameter of 8 mm and a length of 20 mm were grown by the floating zone method. The calcined temperature and time of the LiTaO3 powders was established to be at 850ºC for 10 h. The optimum sintering parameter for the growth was at 1450ºC for 10 h. The optimum conditions for the crystal growth were 3-5 mm/h for the growth rate, 16-20 rpm for the upper-rotation speed, and 18-20 rpm for the lower-rotation speed. The melting aspect in Ar was regular and more stable than in air or N2 atmosphere because the shape of the molten zone was almost flat. The color of the grown crystal was light brown. The crystal color vanished after annealing at 1200ºC for 10 h. Curie temperature fluctuation on the section of the parts of the grown crystals was within 1.5ºC. The transmittance of the grown crystals indicates between 75-80 % in visible and infrared wavelengths.
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