Fluorine lead metavanadate birefringent crystal as well as preparation method and application thereof
A birefringent crystal, lead fluoroaluminate technology, applied in the direction of crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems such as can only be used for Rochnian prism, the separation angle of the speed of light is small, the birefringence is small, etc. , to achieve the effect of short preparation cycle, good mechanical strength and easy storage
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Embodiment 1
[0034] With the chemical reaction formula 4PbO + V 2 o 5 + 10HF → 2Pb 2 VO 2 f 5 + 5H 2 O as an example, the specific operations are as follows:
[0035] a. PbO, V 2 o 5 and HF at a molar ratio of 4:2:35 and placed in a 23 mL high-pressure hydrothermal kettle lined with polytetrafluoroethylene, and then 3 mL of deionized water was added to make it fully mixed.
[0036] b. Transfer the mixed solution in step a to a high-pressure reactor, place it in an oven, heat up to 180 °C at a constant temperature for 3 days at a rate of 20 °C / h, and then lower the temperature at a temperature of 10 °C / h The rate was lowered to room temperature, and a solution containing yellow crystals was obtained;
[0037] c. Filter the crystal solution obtained in step b, and wash with deionized water or absolute ethanol to obtain a yellow transparent single crystal.
Embodiment 2
[0039] With the chemical reaction formula 4PbO + 2NH 4 VO 3 + 10HF → 2Pb 2 VO 2 f 5 + 6H 2 O + NH3↑ as an example, the specific operation is as follows:
[0040] a. PbO, NH 4 VO 3 and HF at a molar ratio of 4:3:38 were placed in a 23 mL high-pressure hydrothermal kettle lined with polytetrafluoroethylene, and then 2 mL of deionized water was added to make it fully mixed.
[0041] b. Transfer the mixed solution in step a to a high-pressure reactor, place it in an oven, heat up to 200 °C at a constant temperature for 2 days at a rate of 40 °C / h, and then lower the temperature at a temperature of 5 °C / h The rate was lowered to room temperature, and a solution containing yellow crystals was obtained;
[0042] c. Filter the crystal solution obtained in step b, and wash with deionized water or absolute ethanol to obtain a yellow transparent single crystal.
Embodiment 3
[0044] According to the chemical reaction formula 4Pb(OH) 2 +V 2 o 5 + 10HF → Pb 2 VO 2 f 5 +9H 2 O as an example, the specific operations are as follows:
[0045] a. Pb(OH) 2 , V 2 o 5 and HF at a molar ratio of 6:2:33 and placed in a 23 mL high-pressure hydrothermal kettle lined with polytetrafluoroethylene, and then 4 mL of deionized water was added to make it fully mixed.
[0046] b. Transfer the mixed solution in step a to a high-pressure reactor, place it in an oven, heat up to 180 °C at a constant temperature for 2 days at a rate of 30 °C / h, and then lower the temperature at a temperature of 10 °C / h The rate was lowered to room temperature, and a solution containing yellow crystals was obtained;
[0047] c. Filter the crystal solution obtained in step b, and wash with deionized water or absolute ethanol to obtain a yellow transparent single crystal.
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