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Sodium fluoborate compound, sodium fluoborate birefringent crystal as well as preparation method and application

A birefringent crystal, sodium fluoroborate technology, applied in chemical instruments and methods, boron halide compounds, crystal growth, etc., can solve the problems of small size, unreachable wave band, high impurity content, etc., and achieve good mechanical properties and growth speed Fast, high product purity effect

Active Publication Date: 2018-05-25
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcite crystals that mainly exist in natural forms have a relatively high impurity content, and artificial synthesis is difficult. Generally, they are relatively small in size and cannot meet the requirements of large-scale optical polarizing elements. Ordinary calcite crystals can only be used in the band above 350nm. Ultraviolet optical grade calcite crystals It is difficult to obtain, and its wavelength band cannot reach the deep ultraviolet region (<200nm)
MgF 2 Crystal is a good material for deep ultraviolet, its transmission range is wide (110-8500nm), but its birefringence is too small, it is not suitable for making Glan prism, it can only be used for Rochon prism , and the beam separation angle is small, the device size is large, and it is inconvenient to use

Method used

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  • Sodium fluoborate compound, sodium fluoborate birefringent crystal as well as preparation method and application
  • Sodium fluoborate compound, sodium fluoborate birefringent crystal as well as preparation method and application
  • Sodium fluoborate compound, sodium fluoborate birefringent crystal as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] By chemical formula: NaBF 4 +NaBO 2 4H 2 O+4H 3 BO 3 =Na 2 B 6 o 9 f 2 +6H 2 O↑+2HF↑, sodium fluoroborate (Na 2 B 6 o 9 f 2 ) compounds:

[0031] NaBF 4 :NaBO 2 4H 2 O:H 3 BO 3 Weigh it into a mortar with a molar ratio of 1:1:4, mix and grind it carefully, put it into a corundum crucible, put it into a muffle furnace, slowly raise the temperature to 200°C, and keep the temperature constant for 12 hours. After cooling, take out the crucible, grind the sample evenly, then place it in the crucible, raise the temperature of the muffle furnace to 400°C, keep the temperature for 48 hours, take out the sample, put it in a mortar, crush and grind it, and the compound sodium fluoroborate single-phase Polycrystalline powder, then carry out X-ray analysis to this polycrystalline powder, gained X-ray spectrogram and finished product Na 2 B 6 o 9 f 2 The X-ray spectra of single crystals ground into powders are consistent;

[0032] The synthesized compound Na ...

Embodiment 2

[0037] According to the reaction formula NaBF 4 +NaBO 2 4H 2 O+2B 2 o 3 =Na 2 B 6 o 9 f 2 +2HF↑synthesis of Na 2 B 6 o 9 f 2 Compound, specific operation steps are carried out according to embodiment 1;

[0038] The synthesized compound Na 2 B 6 o 9 f 2 Weigh it with co-solvent PbO according to the stoichiometric ratio of 1:3, mix evenly, put it into a Φ90mm×90mm open platinum crucible, put the crucible into a crystal growth furnace, raise the temperature to 460°C, keep the temperature for 10 hours, then cool down to 440°C ℃ to obtain a sodium fluoroborate solution;

[0039] Slowly cool down to room temperature at a rate of 0.5°C / h, and crystallize to obtain seed crystals;

[0040] Growing crystals on the surface of the melt or in the melt: fix the obtained seed crystal on the seed crystal rod, lower the seed crystal from the top of the crystal growth furnace, make the seed crystal and extend into the sodium fluoroborate melt, cool down to 410, Constant tempe...

Embodiment 3

[0043] The reaction formula NaF+6H 3 BO 3 =Na 2 B 6 o 9 f 2 +9H 2 O ↑ Synthesis of Na 2 B 6 o 9 f 2 Compound, specific operation steps are carried out according to embodiment 1;

[0044] The synthesized compound Na 2 B 6 o 9 f 2 with co-solvent PbF 2 Weigh it according to the stoichiometric ratio of 1:4, mix it evenly, put it into an open platinum crucible of Φ80mm×80mm, put the crucible into a crystal growth furnace, raise the temperature to 500°C, keep the temperature for 12 hours, and then cool it down to 430°C to obtain fluorine Sodium borate compound solution;

[0045] Slowly cool down to room temperature at a rate of 5°C / h, and use the platinum wire suspension method to obtain small crystals as seed crystals during the cooling;

[0046] Crystal growth on the surface of the melt or in the melt: fix the obtained seed crystal on the seed rod, lower the seed crystal from the top of the crystal growth furnace, make the seed crystal contact with the surface of ...

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Abstract

The invention relates to a sodium fluoborate compound, a sodium fluoborate birefringent crystal as well as a preparation method and an application. The compound has the chemical formula of Na2B6O9F2 and molecular weight of 292.84 and is prepared with a solid phase method. The sodium fluoborate birefringent crystal has the chemical formula of Na2B6O9F2 and molecular weight of 292.84 and belongs toa monoclinic system, the space group is P21 / c and the cell parameters are a=8.1964(12) angstrom, b=13.0005(19) angstrom, c=7.8955(11) angstrom, Z=4 and V=841.3(2) angstrom<3>, and the crystal is grownwith a flux method. The crystal is the birefringent crystal having centimeter-level large size and belonging to the monoclinic system, has birefringence of 0.080 at 589.3 nm and ultraviolet transmitting waveband cut-off edge of 169 nm and is suitable for the birefringent crystal. The crystal has the advantages that the operation is simple, the cost is low, used reagents are inorganic raw materials, the toxicity is low, the growth cycle is short, physical and chemical properties are stable and the like in the growth process. The crystal has important applications in preparation of Glan prisms,Wollaston prisms, Rochon prisms or polarizing beam splitter prisms, optoisolators, circulators and beam displacers.

Description

technical field [0001] The invention relates to a compound sodium fluoroborate and a sodium fluoroborate birefringent crystal, a preparation method and an application. Background technique [0002] Birefringence is a phenomenon in which a light beam incident on an anisotropic crystal is split into two beams and refracted in different directions. Crystals with birefringence are called birefringent crystals. The birefringence of crystals is an important optical performance parameter of electro-optic functional materials. With the rapid development of optical communication technology in recent years, birefringent crystals have become the most important choice for making polarization beam splitting prisms such as Glan prisms and Wollaston prisms, as well as optical isolators and beam splitters. Key materials for optical communication components such as displacers and circulators. [0003] Commonly used birefringent crystal materials mainly include YVO 4 crystal, rutile crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/00C30B29/12G02F1/355C01B35/06
CPCC01B35/06C30B15/00C30B29/12G02F1/3551
Inventor 潘世烈史国强张方方
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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