Borate birefringent crystal for ultraviolet and deep ultraviolet, and growth method and application thereof
A technology of birefringent crystals and growth methods, which is applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of easy deliquescence, small birefringence, and low transmission of crystals, and achieve easy polishing, low deliquescence, Easy to save effects
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[0030] Example 1, Growth of Ba by melt pulling method 2 Mg(B 3 O 6 ) 2 :
[0031] Raw material used (analytical purity): BaCO 3 986.7g
[0032] MgO 100.75g
[0033] HBO 3 927.45g
[0034] (The molar ratio of Ba, Mg and B is 2:1:6)
[0035] The specific steps are as follows: After weighing the above raw materials, put them in a mortar and mix and grind, then put them into a φ85mm×85mm platinum crucible, heat to a molten state to obtain a mixed melt, stir for 48 hours, and determine the above by trying the seed crystals The saturation point temperature of the mixed melt. Seed crystal when the temperature of the mixed melt is 1℃ higher than the saturation point temperature: fix the seed crystal on the end of the seed crystal rod, and put the seed crystal rod from the self-made growth furnace to contact the surface of the mixed melt or make it extend into Into the melt; 30 minutes after the seed crystal is placed, the temperature is ...
Example Embodiment
[0036] Example 2: Growth of Ba by melt spontaneous crystallization method 2 Mg(B 3 O 6 ) 2 :
[0037] Raw materials used (analytically pure): BaCO 3 3197.36g
[0038] MgO 20.17g
[0039] HBO 3 185.49g
[0040] (The molar ratio of Ba, Mg and B is 2:1:6)
[0041] The specific steps are as follows: After weighing the above raw materials, put them in a mortar and mix and grind, then put them into a φ54mm×48mm platinum crucible, heat to a molten state to obtain a mixed melt, stir for 48 hours, and confirm the above by trying seed crystals. Mix the saturation point temperature of the melt, set the temperature to 1°C above the saturation temperature, put the seed rod without the seed crystal into the melt, and then lower the temperature at a rate of 0.5°C / hour to make it spontaneously crystallize, waiting for crystallization After that, the cooling rate is set to 0.5℃ / day, and the crystals gradually grow up. When the crystals grow to a certa...
Example Embodiment
[0042] Example 3 Growth of Ba by flux method 2 Mg(B 3 O 6 ) 2 :
[0043] Raw material used (analytical purity): BaCO 3 78.95g
[0044] MgO 8.06g
[0045] HBO 3 74.3g
[0046] NaF 1.68g (the molar ratio of Ba, Mg, B and NaF is 2:1:6:0.2, which is equivalent to the molar ratio of BMBO to NaF of 1:0.2)
[0047] The specific steps are as follows: After weighing the above raw materials, put them into a mortar and mix and grind, then put them into a platinum crucible, heat to a molten state to obtain a mixed melt, stir for 48 hours, and determine the above mixed melt by trying the seed crystals below. The saturation point of the body. Seed crystal when the temperature of the mixed melt is 3℃ higher than the saturation point temperature: fix the seed crystal on the end of the seed crystal rod, and put the seed crystal rod from the self-made growth furnace to contact the surface of the mixed melt or make it extend into Into the melt; 30 minutes ...
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