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Calcium barium cyanurate double-refraction crystal for UV visible band and preparation method and application

A birefringent crystal, barium cyanurate technology, applied in crystal growth, chemical instruments and methods, single crystal growth and other directions, can solve the problems of easy deliquescence, restricted use, low penetration, etc., and achieve easy polishing and easy cutting. Effect

Inactive Publication Date: 2019-01-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperature phase BaB 2 o 4 The transmission range of (α-BBO) crystal is 189-3500nm, and the birefringence is relatively large, but the crystal is easy to deliquescence, and due to the solid-state phase transition of the crystal, it is easy to crack during the growth process, which has a great impact on the quality of the crystal;
[0004] Ca 3 (BO 3 ) 2 The transmission range of the crystal is 180-3800nm. The disadvantage is that the birefringence in the visible region is relatively small, and the transmission in the ultraviolet region is not high, which limits its use.

Method used

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  • Calcium barium cyanurate double-refraction crystal for UV visible band and preparation method and application
  • Calcium barium cyanurate double-refraction crystal for UV visible band and preparation method and application
  • Calcium barium cyanurate double-refraction crystal for UV visible band and preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1, adopt high temperature melt spontaneous crystallization method to prepare Ba 2 Ca(C 3 N 3 o 3 ) 2 Birefringent crystals:

[0046] Weigh 4.166 g of BaCl 2 , 1.110 g CaCl 2 and 4.866 grams of KCNO (i.e. BaCl 2 : CaCl 2 : KCNO=0.02mol: 0.01mol: 0.06mol), after mixing evenly, put it into a quartz glass tube of Φ20mm×100mm, and evacuate to 10 -3 After that, it was packaged with an oxyhydrogen flame and placed in a tube-type growth furnace, slowly raised to 500°C, kept at a constant temperature for 72 hours, and slowly cooled to room temperature at a rate of 1°C / h, and the tube-type growth furnace was closed; after the quartz tube cooled Cut it open to obtain centimeter-level colorless and transparent Ba 2 Ca(C 3 N 3 o 3 ) 2 crystals.

Embodiment 2

[0047] Embodiment 2, adopt crucible descending method to prepare Ba 2 Ca(C 3 N 3 o 3 ) 2 Birefringent crystals:

[0048] Weigh 8.332 grams of BaCl 2 , 2.220 g CaCl 2 and 9.732 grams of KCNO (BaCl 2 : CaCl 2 : KCNO=0.04mol: 0.02mol: 0.12mol), after uniform mixing, put it into a Φ25mm×200mm quartz glass tube, vacuumize to 10-3 Pa, seal it with an oxygen-hydrogen flame and place it in a tubular growth furnace , slowly raised to 400 ° C to react the raw materials in solid phase for 96 hours, close the tubular growth furnace, wash the obtained product with methanol repeatedly to remove the by-product KCl, dry and grind to obtain powdered Ba 2 Ca(C 3 N 3 o 3 ) 2 compound. Powdered Ba 2 Ca(C 3 N 3 o 3 ) 2 Put the compound into a Φ25mm×200mm quartz glass tube, evacuate to 10-3 Pa, seal it with an oxyhydrogen flame, place it in a crystal growth furnace, and slowly raise it to 500°C. The speed of 10mm / hour drops vertically, and the growth period is 5-20 days; after th...

Embodiment 3

[0050] Embodiment 3, using the Ba of the present invention for the ultraviolet-visible band 2 Ca(C 3 N 3 o 3 ) 2 Birefringent crystals make Glan-type prisms:

[0051] Use Ba 2 Ca(C 3 N 3 o 3 ) 2 Crystals - Canadian resin (or air thin layer) - Ba 2 Ca(C 3 N 3 o 3 ) 2 The crystal constitutes a Glan-type prism ( figure 2 ), crystal n e o . When the incident light is incident perpendicular to the end face of the prism, neither the o-ray nor the e-ray will be deflected, and the incident angle on the inclined plane is equal to the angle between the inclined plane of the prism and the right-angled plane. During production, the angle between the oblique surface of the prism and the right-angled surface is greater than the critical angle of the o-ray on the glued surface, so that the o-ray will be totally reflected on the glued surface, and will be absorbed by the coating on the right-angled surface of the prism or leak out through the o-ray The window leaks out, and ...

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Abstract

The invention discloses a calcium barium cyanurate double-refraction crystal for UV visible band and a preparation method and application thereof. The chemical formula is Ba2Ca(C3N3O3)2 and belongs totrigonal system; the space group is as shown in the description; the cell parameters are as shown in the description, wherein Z is 3; the crystal grows through a high-temperature melt spontaneous crystallization method or a crucible lowering method. The calcium barium cyanurate double-refraction crystal prepared by the method is a negative single-axis crystal; the transmittance range is 240-5000nm; the refractivity calculation value under gamma of 532nm is that no equals to 2.008, ne equals to1.641, and delta n equals to 0.367. The crystal is easy to grow, easy to cut, easy to polish, stablein air, and not dissolved in water; the crystal can be used for preparing polarization beam splitters such as a Glan prism, a Wollaston prism, a Rochon prism or a beam-separated polarizer; and the crystal has an important application in the optical and communication fields.

Description

technical field [0001] The present invention relates to a kind of cyanurate birefringent crystal, especially the chemical formula suitable for ultraviolet-visible band is Ba 2 Ca(C 3 N 3 o 3 ) 2 The birefringent crystal and its preparation method and use. Background technique [0002] Birefringence is one of the important characteristics of light propagating in anisotropic media. When light enters an anisotropic medium, it is decomposed into two beams of light and refracted along different directions. The two outgoing beams are linearly polarized lights with vibration directions perpendicular to each other, and one of them obeys the law of refraction is called ordinary light. (o light), its refractive index is n o Indicates that another beam that does not follow the law of refraction is called extraordinary light (e light), and its refractive index is expressed by n e This phenomenon is called birefringence, and crystals with anisotropy are called birefringent crystal...

Claims

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Application Information

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IPC IPC(8): C30B11/02C30B29/10
Inventor 姚吉勇李壮郭扬武罗晓宇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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