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Method for growth of compound cadmium sodium borate crystal

A sodium borate and compound technology, which is applied in the growth field of the compound sodium cadmium borate (Na2Cd7B8O20) crystal, can solve the problem of no growth and achieve the effects of fast growth, low viscosity and low cost

Active Publication Date: 2014-11-12
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CrystEngComm magazine (2013, Vol15, 3412-3416) reported that Na 2 Cd 7 B 8 o 20 Crystal, its molecular weight is 1239.26, this crystal belongs to the orthorhombic crystal system, the space group is Fdd2, and the unit cell parameter is Z=108, but didn't grow up 2 Cd 7 B 8 o 20 crystals, and for most functional crystal applications, it is necessary to grow single crystals with high optical quality up to several millimeters or even centimeters

Method used

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  • Method for growth of compound cadmium sodium borate crystal
  • Method for growth of compound cadmium sodium borate crystal

Examples

Experimental program
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Embodiment 1

[0034] According to the reaction formula Na 2 CO 3 +CdO+H 3 BO 3 →Na 2 Cd 7 B 8 o 20 +H 2 O↑+CO 2 ↑ Preparation of compound Na 2 Cd 7 B 8 o 20 ;

[0035] Compound sodium cadmium borate (Na 2 Cd 7 B 8 o 20 )Synthesis:

[0036] Na 2 CO 3 :CdO:H 3 BO 3 Weigh it into a mortar with a molar ratio of 1:7:8, mix and grind carefully, put it into a corundum crucible, put it into a muffle furnace, slowly raise the temperature to 200°C, keep the temperature constant for 3 hours, cool to room temperature and grind evenly, slowly Raise the temperature to 500°C, exhaust the gas as much as possible, take out the crucible after cooling, grind the sample evenly, and then put it in the crucible, raise the temperature of the muffle furnace to 670°C, keep the temperature for 48-90 hours, take out the sample, put it in the research The single-phase polycrystalline powder of sodium borate cadmium compound can be obtained by crushing and grinding in a bowl, and then the polycrys...

Embodiment 2

[0043] According to the reaction formula Na 2 CO 3 +CdO+B 2 o 3 →Na 2 Cd 7 B 8 o 20 +H 2 O↑+CO 2 ↑ Preparation of compound Na 2 Cd 7 B 8 o 20 ;

[0044] Compound sodium cadmium borate (Na 2 Cd 7 B 8 o 20 ) is synthesized according to Example 1;

[0045] The synthesized compound sodium cadmium borate and cosolvent B 2 o 3 -Mix NaF=1:2, then use a Φ80mm×80mm open platinum crucible as a container, put the crucible into the single crystal growth furnace, seal the opening on the top of the furnace with insulation material, and the top of the furnace corresponds to the center of the crucible Leave a small hole for the seed rod to come out, heat up to 800°C at a heating rate of 5°C / hour, keep the temperature for 10 hours, and quickly cool down to 750°C to obtain a mixed melt of sodium cadmium borate and co-solvent ;

[0046]At a temperature of 750°C, quickly lower the seed rod into the melt, wait for it to produce drift crystals, keep the temperature for 0.5h wit...

Embodiment 3

[0050] According to the reaction formula NaNO 3 +CdO+H 3 BO 3 →Na 2 Cd 7 B 8 o 20 +NO 2 ↑+H 2 O ↑ Preparation of compound Na 2 Cd 7 B 8 o 20 ;

[0051] Compound sodium cadmium borate (Na 2 Cd 7 B 8 o 20 ) is synthesized according to Example 1;

[0052] Preparation of co-solvent Na 2 B 4 o 7 : Use analytically pure NaNO 3 and H 3 BO 3 molar ratio NaNO 3 :H 3 BO 3 =1:4 for mixing, after mixing and grinding, sintering at a temperature of 420°C for 24 hours to make a cosolvent Na 2 B 4 o 7 ;

[0053] The synthesized Na 2 Cd 7 B 8 o 20 With the prepared co-solvent Na 2 B 4 o 7 Massive Na 2 Cd 7 B 8 o 20 :Na 2 B 4 o 7 =1:1 After mixing evenly, put it into an open platinum crucible of Φ80mm×80mm, put the crucible into the single crystal growth furnace, seal the opening on the top of the furnace with insulating material, and place it at the position corresponding to the center of the crucible on the top of the furnace Leave a small hole for t...

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Abstract

The invention relates to a method for growth of compound cadmium sodium borate crystal; according to the method, the compound cadmium sodium borate crystal is prepared as follow: mixing compound cadmium sodium borate with cosolvent B2O3-R system or Na2B4O7, heating, performing homoiothermy, cooling to obtain a cadmium sodium borate and cosolvent mixed molten liquid, putting seed crystals loaded on a seed crystal rod in the prepared mixed molten liquid, simultaneously rotating the seed crystal rod, cooling, and then slowly cooling to obtain a required crystal, lifting the crystal off from the liquid surface, and cooling to the room temperature to obtain the compound cadmium sodium borate crystal. The method has the advantages of fast growth and low cost, the Na2Cd7B8O20 crystal with the size of 20mm * 20MM * 10mm and high optical quality can be grown, and the crystal obtained through the method is good in mechanical performance and not easy to break and deliquesce and is easy to process.

Description

technical field [0001] The present invention relates to a kind of compound sodium cadmium borate (Na 2 Cd 7 B 8 o 20 ) crystal growth method. Background technique [0002] In recent decades, a large number of borates have been widely studied, and a large number of nonlinear compound crystal materials with excellent frequency doubling effects have emerged, such as BBO, LBO, KBBF, KDP, etc. Alkali metal cadmium borates have been rarely reported so far, and most of the reported compounds are compounds with a central structure. [0003] CrystEngComm magazine (2013, Vol15, 3412-3416) reported that Na 2 Cd 7 B 8 o 20 Crystal, its molecular weight is 1239.26, this crystal belongs to the orthorhombic crystal system, the space group is Fdd2, and the unit cell parameter is Z=108, but didn't grow up 2 Cd 7 B 8 o 20 Crystals, and for most applications of functional crystals, it is necessary to grow single crystals with high optical quality up to several millimeters o...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B11/06
Inventor 潘世烈周琳
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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