A sodium lithium borate birefringent crystal, and a preparing method and uses thereof

A birefringent crystal, lithium borate technology, applied in chemical instruments and methods, crystal growth, single crystal growth and other directions, can solve the problems of small birefringence, small size, difficult to process and so on

Active Publication Date: 2017-07-04
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Take MgF 2 For example, its transmission range is 110-8500nm, it is a good crystal material for deep ultraviolet, but its birefringence is too small, it is not suitable for making Glan prism, it can only be used for Luo Hungarian prism, and the separation angle of light speed is small, the size of the period is large, and it is inconvenient to use; the birefringence of quartz crystal is also small, and the same problem exists; YVO 4 The crystal is also an artificially prepared birefringent crystal, and due to the YVO 4 The melting point is high, and the iridium crucible must be used for pulling growth, and the growth atmosphere is a weak oxygen atmosphere, so there is a problem of price change of yttrium element during growth, which reduces the quality of the crystal, making it difficult to obtain high-quality crystals and its penetration. The range is 400-5000nm, it cannot be dire

Method used

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  • A sodium lithium borate birefringent crystal, and a preparing method and uses thereof
  • A sodium lithium borate birefringent crystal, and a preparing method and uses thereof
  • A sodium lithium borate birefringent crystal, and a preparing method and uses thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] According to the reaction formula: 2Li 2 CO 3 +2Na 2 CO 3 +4H 3 BO 3 =2Li 2 Na 2 B 2 o 5 +6H 2 O↑+4CO 2 ↑Synthetic compound Li 2 Na 2 B 2 o 5 :

[0048] a. Will Li 2 CO 3 、Na 2 CO 3 and H 3 BO 3 According to the molar ratio of lithium:sodium:boron 1:1:1, put it into a mortar and grind it carefully, then put it into a Φ100mm×100mm open corundum crucible, put it into a muffle furnace, and slowly heat up to 430°C , constant temperature for 24 hours, take out the crucible after cooling, the sample is relatively loose at this time, then take out the sample and grind it evenly, then put it in the crucible, keep the temperature in the muffle furnace at 550°C for 48 hours, take it out and grind it fully, that is The single-phase polycrystalline powder of lithium sodium borate compound is ground in a mortar for X-ray analysis, and the obtained X-ray spectrum is consistent with that of Li 2 Na 2 B 2 o 5 The X-ray spectra obtained by the single crystal str...

Embodiment 2

[0055] According to the reaction formula: 2Li 2 CO 3 +2Na 2 NO 3 +4H 3 BO 3 =2Li 2 Na 2 B 2 o 5 +6H 2 O↑+2CO 2 +2NO 2 ↑Synthetic compound Li 2 Na 2 B 2 o 5 , the concrete operation is carried out by embodiment 1 step a:

[0056] B, the compound Li that step a obtains 2 Na 2 B 2 o 5 Put the single-phase polycrystalline powder into an open platinum crucible of Φ100mm×100mm, put the crucible into a single crystal furnace, heat and melt it completely, keep the temperature at 635°C for 5 hours, and then cool it down to 570°C to obtain a mixed melt;

[0057] c. Preparation of Li 2 Na 2 B 2 o 5 Seed crystal: Slowly lower the mixed melt obtained in step b to room temperature at a rate of 0.5°C / h, use a platinum wire suspension method to obtain small crystals during the cooling process, and spontaneously crystallize to obtain seed crystals;

[0058] d, growing crystals on the surface of the compound melt or in the melt: the crucible with the mixed melt of step b...

Embodiment 3

[0063] According to the reaction formula: 4LiOH+2Na 2 CO 3 +4H 3 BO 3 =2Li 2 Na 2 B 2 o 5 +8H 2 O↑+2CO 2 ↑Synthetic compound Li 2 Na 2 B 2 o 5 , the concrete operation is carried out by embodiment 1 step a:

[0064] b, the obtained compound Li 2 Na 2 B 2 o 5 Put the single-phase polycrystalline powder into an open platinum crucible of Φ100mm×100mm, put the crucible into a single crystal furnace to heat and melt it completely, keep the temperature at 630°C for 10 hours, and then cool it down to 580°C to obtain a mixed melt;

[0065] c. Preparation of sodium lithium borate seed crystals: Slowly lower the mixed melt obtained in step b to room temperature at a rate of 0.7°C / h, and use the hanging platinum wire method to obtain small crystals during the cooling process, and spontaneously crystallize to obtain seed crystals;

[0066] d. Growing crystals on the surface of the compound melt or in the melt: place the crucible containing the mixed melt of step b in the ...

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Abstract

The invention relates to a sodium lithium borate birefringent crystal, and a preparing method and uses thereof. The chemical formula of the crystal is Li<2>Na<2>B2O5, the molecular weight of the crystal is 161.4, the crystal belongs to an orthorhombic system, and the space group is Cmcm. According to cell parameters, a is 3.313 angstroms, b is 9.985 angstroms, c is 13.400 angstroms, V is 443.3 angstrom<3>, and Z is 4. The transparent range of the crystal is 170-3500 nm. The birefringence of the crystal is between 0.108 (1064 nm) and 0.248 (200 nm). The sodium lithium borate is synthesized by adopting a solid phase reaction process. The Li<2>Na<2>B2O5 birefringent crystal grows by adopting a high-temperature melt process or a cosolvent process. The crystal prepared by the method has characteristics of proper mechanical hardness, easy cutting, polishing and storage, congruent melting, easy growth and a high birefringence, has important applications in the optical and communication fields, and can be used for manufacturing polarizing beam splitter prisms, phase delay devices, electrooptical modulators, and the like.

Description

technical field [0001] The invention relates to a birefringent crystal of compound lithium sodium borate and its preparation method and application, in particular to a compound whose molecular formula is Li for the infrared-deep ultraviolet band. 2 Na 2 B 2 o 5 Preparation method and application of lithium sodium borate birefringent crystal Background technique [0002] Birefringence refers to the phenomenon that a beam of light is projected onto the surface of a crystal to produce two beams of refracted light. The root cause of this phenomenon is the anisotropy of the crystal material. When light propagates in an optical heterogeneous homogeneous body (such as a crystal other than a cubic system), its vibration characteristics will be changed except for a few special directions (along the direction of the optical axis), and it will be decomposed into two electric field vector vibration directions Two beams of polarized light that are perpendicular to each other, have di...

Claims

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Application Information

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IPC IPC(8): C30B29/16C30B28/02C30B15/00
Inventor 潘世烈陈艳娜张敏陈惠敏安东海
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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