Growth method for alpha-NaYF4 (cubic sodium yttrium fluoride) monocrystals
A growth method, single crystal technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., to achieve the effect of saving electricity costs, facilitating large-scale industrial production, and good quality
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Embodiment 1
[0021] According to NaF:KF:YF 3 The molar ratio is 1.25:1.00:2.48, and the NaF raw material with a purity greater than 99.99%, the KF raw material with a purity of 99.99%, and the YF raw material with a purity of 99.99% are weighed respectively. 3 The raw materials are mixed and placed in a mill, and ground and mixed for 5.5 hours to obtain a uniform powder mixture; the mixture is fluffy placed in a boat-shaped platinum crucible, and then the boat-shaped platinum crucible is installed in the tube-type resistance furnace Platinum piping, then high-purity N 2 Gas removes the air in the platinum pipe, and conducts leak detection on the platinum pipe; then gradually raises the temperature of the furnace body of the tubular resistance furnace to 790°C, passes HF gas, and reacts for 2 hours to remove possible H 2 O and oxyfluoride, during the reaction process, use NaOH solution to absorb HF gas in the tail gas. After the reaction, stop passing HF gas, close the tube resistance furn...
Embodiment 2
[0026] Basically the same as Example 1, the difference is only raw material NaF: KF: YF 3 The molar ratio is 1:1:2.24, weighed and mixed, placed in a mill, milled and mixed for 5 hours, the reaction time with HF gas in the platinum pipeline is 5 hours, the furnace temperature is 950°C, and the inoculation temperature is 820°C , the temperature gradient at the solid-liquid interface is 50° C. / cm, the crystal growth rate is 0.2 mm / h, and the furnace temperature drop rate is 80° C. / h. The XRD pattern and transmission spectrum of the crystal are basically the same as in Example 1.
Embodiment 3
[0028] Basically the same as Example 1, the difference is only raw material NaF: KF: YF 3 The molar ratio is 2.40:1:3.40, weighed and mixed, placed in a mill, milled and mixed for 6 hours, the reaction time with HF gas in the platinum pipeline is 1 hour, the furnace temperature is 980°C, and the inoculation temperature is 860°C. The temperature gradient at the solid-liquid interface is 90°C / cm, the crystal growth rate is 2.0mm / h, and the furnace temperature drop rate is 20°C / h. The XRD pattern and transmission spectrum of the crystal are basically the same as in Example 1.
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