Barium magnesium cyanurate birefringent crystals for ultraviolet visible wavebands and preparation method and application of crystals

A technology of birefringent crystals and barium cyanurate, which is applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of crystal quality, crystal deliquescence, low permeability, etc., and achieve easy storage and polishing , easy-to-grow effect

Inactive Publication Date: 2019-01-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • 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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  • Barium magnesium cyanurate birefringent crystals for ultraviolet visible wavebands and preparation method and application of crystals
  • Barium magnesium cyanurate birefringent crystals for ultraviolet visible wavebands and preparation method and application of crystals
  • Barium magnesium cyanurate birefringent crystals for ultraviolet visible wavebands and preparation method and application of crystals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0046] Weigh 4.166 g of BaCl 2 , 0.952 g MgCl 2 and 4.866 grams of KCNO (i.e. BaCl 2 : MgCl 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, can get colorless and transparent Ba 2 Mg(C 3 N 3 o 3 ) 2 crystals.

Embodiment 2

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

[0048] Weigh 8.332 grams of BaCl 2 , 1.904 g MgCl 2 and 9.732 grams of KCNO (BaCl 2 : MgCl 2 : KCNO=0.04mol:0.02mol:0.12mol), after mixing evenly, put it into a quartz glass tube of Φ25mm×200mm, and evacuate to 10 -3 After that, it was packaged with an oxyhydrogen flame and placed in a tubular growth furnace, slowly raised to 400°C to react the raw materials in solid state for 96 hours, then the tubular growth furnace was closed, and the obtained product was washed repeatedly with methanol to remove the by-product KCl, dried and ground Crushed to get Ba 2 Mg(C 3 N 3 o 3 ) 2 powder. Will Ba 2 Mg(C 3 N 3 o 3 ) 2 Put the powder into a quartz glass tube of Φ25mm×200mm, and evacuate to 10 -3 After Pa, it is packaged with an oxyhydrogen flame and placed in a crystal growth furnace, and slowly raised to 500°C. After the raw materials are completely melted, the growt...

Embodiment 3

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

[0051] Use Ba 2 Mg(C 3 N 3 o 3 ) 2 Crystals - Canadian resin (or air thin layer) - Ba 2 Mg(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 t...

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Abstract

The invention discloses barium magnesium cyanurate birefringent crystals for ultraviolet visible wavebands and a preparation method and application of the crystals. The chemical formula is Ba2Mg(C3N3O3)2 and belongs to a trigonal system, and the space group and unit-cell parameters are shown in the descriptions. The crystals grow by means of a high-temperature melt spontaneous crystallization method or a Bridgman-Stockbarger method. The barium magnesium cyanurate birefringent crystals obtained by means of the method are uniaxial negative crystals, the transmission range is 230-3,000 nm, and the calculation values of the refractive indexes at the place where lambda is equal to 800 nm are as follow:no is equal to 2.00, ne is equal to 1.649, and deltan is equal to 0.351. The crystals easily grow and are easy to cut, grind, polish and store, stable in air, uneasy to deliquesce and insoluble in water; the crystals can be used for manufacturing Glan prisms, Wollaston prisms, Rochon prisms orbeam splitting polarization device or other polarization beam splitting prisms and have important application in the field of optics and communications.

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 Mg(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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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/10C30B11/00
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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