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Compound sodium metaborate birefringent crystal and preparing method and application thereof

A technology of birefringent crystals and sodium metaborate, which is applied in boron oxide compounds, chemical instruments and methods, borates, etc., can solve problems that have not yet been seen

Active Publication Date: 2016-11-23
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

However, to test the basic physical properties (including birefringence) of a crystal, the size of the crystal needs to be several millimeters or even a centimeter-level single crystal. So far, there has been no relevant preparation of NaBO with a size sufficient for physical property testing. 2 Single crystal reports, and nothing about NaBO 2 Report on Test Results of Single Crystal Birefringence Optical Properties

Method used

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  • Compound sodium metaborate birefringent crystal and preparing method and application thereof
  • Compound sodium metaborate birefringent crystal and preparing method and application thereof
  • Compound sodium metaborate birefringent crystal and preparing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] According to the reaction formula NaBO 2 4H 2 0→NaBO 2 +4H 2 O ↑ synthetic compound NaBO 2 :

[0040] NaBO 2 4H 2 0, put it into a mortar and grind it carefully, then put it into an open corundum crucible of Φ100mm×100mm, put it into a muffle furnace, raise the temperature slowly to 450°C, keep the temperature constant for 30 hours, take out the crucible after cooling, at this time The sample is relatively loose, then take out the sample and re-grind it evenly, then put it in the crucible, keep the temperature in the muffle furnace at 700°C for 48 hours, take it out, and get NaBO 2 Powder, ground in a mortar for X-ray analysis, the resulting X-ray spectrum and NaBO 2 The X-ray spectra obtained by the single crystal structure are consistent;

[0041] The obtained compound NaBO 2 Put the single-phase polycrystalline powder into an open platinum crucible of Φ100mm×100mm, put the crucible into a single crystal furnace and heat it completely to melt, keep the temper...

Embodiment 2

[0046] According to the reaction formula Na 2 CO 3 +2H 3 BO 3 +0.5NaF→2NaBO 2 +CO 2 ↑+3H 2 O↑+0.5NaF Synthetic Compound NaBO 2 :

[0047] Na 2 CO 3 、H 3 BO 3 Weigh the raw materials directly, mix them with the flux NaF at a molar ratio of 1:2:0.5, put them into an open platinum crucible of Φ100mm×100mm, put the crucible into a single crystal furnace and heat it completely to melt, at a temperature of 950°C After constant temperature for 5 hours, the temperature was lowered to 850°C to obtain a mixed melt;

[0048] Preparation of sodium metaborate seed crystals: Slowly lower the obtained mixed melt to room temperature at a rate of 2°C / h, use the hanging platinum wire method to obtain small crystals during the cooling process, and spontaneously crystallize to obtain seed crystals;

[0049] Place the crucible with the prepared mixed melt in the single crystal furnace, fix the obtained seed crystal on the seed crystal rod, put the seed crystal from the top of the singl...

Embodiment 3

[0053] By reaction Na 2 CO 3 +2H 3 BO 3 +0.6NaF→2NaBO 2 +CO 2 ↑+3H 2 O↑+0.6NaF Synthetic Compound NaBO 2 :

[0054] Na 2 CO 3 、H 3 BO 3 Weigh the raw materials directly, mix them with the flux NaF at a molar ratio of 1:2:0.6, put them into an open platinum crucible of Φ100mm×100mm, and heat it to a temperature of 900°C at a heating rate of 20°C / h , keep the temperature for 4 hours, and then lower the temperature to 860°C to obtain a mixed melt;

[0055] Preparation of NaBO 2 Seed crystal: The obtained mixed melt is slowly lowered to room temperature at a rate of 1.5°C / h. During the cooling process, a small crystal is obtained by hanging a platinum wire method, and a seed crystal is obtained by spontaneous crystallization;

[0056] Place the crucible with the prepared mixed melt in the single crystal furnace, fix the obtained seed crystal on the seed crystal rod, put the seed crystal from the top of the single crystal furnace, preheat for 40 minutes, and then make ...

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Abstract

The invention relates to a compound sodium metaborate birefringent crystal and a preparing method and application thereof, in particular to a sodium metaborate birefringent crystal with a molecular formula of NaBO2 used in the deep-ultraviolet-infrared waveband. The chemical formula of the crystal is NaBO2, molecular weight is 65.8, the crystal belongs to a trigonal system, space group is shown in the description, and cell parameters a=11.8617angstroms, b=11.8617angstroms, c=6.3957angstroms, V=590.93 cubic angstroms, and Z=4; light-pervious range is 180-3500 nm, and birefringence is between 0.09(3500 nm) and 0.23(180 nm). Crystal growth is conducted with a high-temperature melt method or high-temperature solution method. The crystal is moderately hard and easy to process, growth is easy due to congruent melting, and birefringence is high; the crystal has a high application value in the optical and communication fields and can be used for preparing optoisolators, circulators, light beam displacers, optical polarizers or optical modulators.

Description

technical field [0001] The invention relates to a compound sodium metaborate birefringent crystal and its preparation method and application, in particular to a compound whose molecular formula is NaBO used in the infrared-deep ultraviolet band 2 Preparation method and application of sodium metaborate 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 different propagation sp...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B11/00C01B35/12
Inventor 潘世烈安东海张敏陈惠敏
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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