Birefringent crystal for UV-visible band, powder and preparation methods thereof

A technology of birefringent crystals and wavelength bands, applied in the field of birefringent crystals and their preparation, cyanurate birefringent crystals and their powder preparation, can solve the problems of small size, inconvenient use, small birefringence, etc., and achieve fast speed Effect

Active Publication Date: 2019-08-30
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

YVO 4 The crystal has a large birefringence, but it is opaque below 400nm, and it is mostly used in the near-infrared band but not in the ultraviolet band; calcite CaCO 3 Crystal is an excellent near-ultraviolet and visible birefringent crystal, but it mainly exists in natural form with small size and high impurities, so it is impossible to make large-scale optical polarizing elements, and artificial growth is difficult; MgF 2 The crystal has a very wide transmission range (110-8500nm), and can be applied to the deep ultraviolet band below 200nm, but its birefringence is too small (the birefringence at 253.7nm is only 0.0128), and the device size is large when used, so it is very difficult to use Inconvenience; α-BaB 2 o 4 The crystal has a large birefringence and a wide light transmission range, and can be used in the near-infrared, visible and ultraviolet bands, but due to the solid-state phase transition, α-BaB 2 o 4 It is easy to crack during the crystal growth process, and it is difficult to obtain high-quality and large-sized crystals

Method used

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  • Birefringent crystal for UV-visible band, powder and preparation methods thereof
  • Birefringent crystal for UV-visible band, powder and preparation methods thereof

Examples

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Embodiment 1

[0020] Embodiment 1, adopt high-temperature solid phase reaction method to prepare Ba 2 (C 3 N 3 o 3 ) CNO crystals:

[0021] Weigh 0.208 g of anhydrous BaCl 2 and 0.203 g of anhydrous KOCN (i.e. BaCl 2 : KOCN=1mmol: 2.5mmol), after mixing evenly, put it into a quartz ampoule of Φ16mm×200mm, and vacuumize the ampoule to 10 -3 Pa is melted and sealed, put into a muffle furnace, and heated to 700K within 5 hours, and after 24 hours of heat preservation, the furnace is closed and cooled to room temperature naturally, and the product is washed with ethanol to obtain Ba 3 (C 3 N 3 o 3 ) 2 Pure phase powder. After that, Ba will be obtained 3 (C 3 N 3 o 3 ) 2 The pure phase powder is placed in a quartz ampoule and the ampoule is evacuated to 10 -3 Pa was melted and sealed, put into a muffle furnace, heated to 893K within 5 hours and kept for 24h, then slowly cooled to 423K at a rate of 3K / h, and finally closed the furnace and naturally cooled to room temperature to ob...

Embodiment 2

[0022] Embodiment 2, adopt high temperature solid state reaction method to synthesize Ba 2 (C 3 N 3 o3 )CNO powder:

[0023] Weigh 3.536 grams of anhydrous BaCl 2 and 2.754 grams of anhydrous KOCN (molar ratio = 1:2), placed in the quartz ampoule of Φ16mm × 200mm after mixing, the ampoule was evacuated to 10 -3 Pa and melted and sealed, put it into a muffle furnace, raised the temperature to 873K at a rate of 40K / h, kept the temperature for 72 hours, and then slowly cooled to room temperature at a rate of 3K / h, and took out the sample after cooling; After the sample is ground, the product can be obtained by washing and filtering with ethanol, and the product is confirmed by X-ray diffraction as follows: figure 2 As shown, it is indeed powdery Ba 2 (C 3 N 3 o 3 ) CNO crystals.

[0024] The preparation method of the invention has the advantages of being simple, easy to implement, reliable and the like, and the obtained product has good uniformity and high purity.

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Abstract

The invention discloses a birefringent crystal for a UV-visible band; the chemical formula of the crystal is Ba2(C3N3O3)CNO. The crystal belongs to a triclinic system, and the space group has the cellparameters that alpha is equal to 82.146 degrees, beta is equal to 75.303 degrees, gamma is equal to 60.689 degrees, and Z is equal to 2; the transmission range of the crystal is 240-2000 nm; the calculated value delta n of birefringence is equal to 0.36 at lambda being equal to 800 nm, and the value is twice that of a calcite CaCO3 crystal; the birefringent crystal can be used for fabricating photoelectric elements such as polarization polarizing prisms and polarization beam splitter prisms in the UV-visible band. The invention also provides preparation methods of the crystal and a pure powder phase.

Description

technical field [0001] The invention relates to a birefringent crystal and a preparation method thereof, in particular to a cyanurate birefringent crystal and a powder preparation method thereof, and belongs to the technical fields of crystal materials and optics. Background technique [0002] Birefringence is a phenomenon that when a beam of light is incident on an anisotropic crystal, it is decomposed into two beams of light and refracted in different directions. The two beams of light produced by birefringence are linearly polarized lights whose polarization directions are perpendicular to each other, one of which obeys the law of refraction is called ordinary light (o light, whose refractive index is expressed by n o means that the refractive index does not change with the incident direction); another beam that does not follow the law of refraction is called extraordinary light (e light, whose refractive index is n e Indicates that the refractive index will change with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B1/10C30B29/10
CPCC30B1/10C30B29/10
Inventor 尹文龙唐建康开进张羽谢婧窦云巍袁泽锐方攀陈莹康彬
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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