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

Active Publication Date: 2017-03-22
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgF 2 The transmission range of the crystal is 110-8500 nm, it is a good material for deep ultraviolet, but its birefringence is too small, it is not suitable for ...

Method used

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  • Fluorine lead metavanadate birefringent crystal as well as preparation method and application thereof
  • Fluorine lead metavanadate birefringent crystal as well as preparation method and application thereof
  • Fluorine lead metavanadate birefringent crystal as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a fluorine lead metavanadate birefringent crystal as well as a preparation method and application thereof. The crystal has a chemical formula of Pb2VO2F5, belongs to a triclinic crystal system, and has a space group of rho-1; cell parameters of the crystal are shown as follows: a is equal to 5.6827(6) ANG, b is equal to 7.3729(8) ANG, c is equal to 8.3478(10) ANG, V is equal to 289.77(6) ANG<3>, and Z is equal to 2; the crystal is applicable to infrared-visible wavebands, and the transmission scope is 450-1300 nm; the birefringence ranges between 0.327 and 0.579, and the crystal is grown by adopting a hydrothermal method; and the crystal is regarded as a positive biaxial crystal because the following formula is met: the difference between nz and ny is greater than that between ny and nx. The crystal obtained according to the preparation method provided by the invention is easy to grow, polish, cut and store, chemically stable, and not easy to dissolve in water; meanwhile, the crystal has the advantages that the preparation period is short, the operation is simple, the cost is low, and the size is relatively large; and accordingly, the crystal can be applied to manufacturing of a Glan prism, a Wollaston prism, a Rochon prism or a beam splitting polarizer, and other polarization beam splitting prisms, and has important application value in the fields of optics and communication.

Description

technical field [0001] The present invention relates to a kind of birefringent crystal of lead fluoroaluminate and its preparation method and application, especially a kind of molecular formula for infrared-visible band is Pb 2 VO 2 f 5 Lead fluoroaluminate birefringent crystal and its preparation method and application. Background technique [0002] At present, the main birefringent materials used are calcite crystal, rutile crystal, LiNbO 3 Crystal, YVO 4 Crystal, α-BaB 2 o 4 Crystal and MgF 2 crystals etc. However, calcite crystals mainly exist in natural forms, and artificial synthesis is relatively difficult. Generally, they are relatively small in size and high in impurity content, which cannot meet the requirements of large-scale optical polarizing elements. They are also easy to dissociate, difficult to process, and low in crystal utilization. Calcite crystals can only be used in the wavelength band above 350nm, and it is difficult to obtain ultraviolet optic...

Claims

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Application Information

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IPC IPC(8): C30B29/30C30B7/10G02B5/32
CPCC30B7/10C30B29/30G02B5/32
Inventor 陈兆慧张志忠井群
Owner XINJIANG UNIVERSITY
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