Method for controlling solution crystal growth rate

A solution crystal growth, crystal growth technology, applied in the field of material science, can solve the problems of crystal growth rate control, solution leakage, etc.

Inactive Publication Date: 2009-08-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the purpose of the present invention is to solve the crystal growth rate control problem and the solution leakage problem in the space (microgravity) adopting the low-temperature solution evaporation method crystal growth, and propose a new method

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  • Method for controlling solution crystal growth rate

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Take the growth of lithium iodate crystals as an example: prepare a saturated solution of lithium iodate near room temperature with a density of 1.5-1.55, take 680 ml of this lithium iodate solution and place it in a crystallizer (fix the lithium iodate seed crystal at the bottom of the crystallizer in advance ), using Huitian 906 silica gel to bond the stainless steel mesh-hydrophobic polytetrafluoroethylene microporous membrane-the edge of the stainless steel mesh to form a three-layer structure, and stick this three-layer structure to the ring on the top cover of the crystallizer On the step (the top cover of the crystallizer is processed into a 5 mm annular step in advance). The pore diameter of the polytetrafluoroethylene microporous membrane is 0.45 microns, and the evaporation area is 9 cubic centimeters. Use this three-layer structure to seal the crystallizer, and raise the temperature to 70°C. As time goes on, the solvent gradually evaporates to the outside of ...

Embodiment 2

[0032] Take the growth lithium iodate crystal as an example: Take the growth lithium iodate crystal as an example: prepare a saturated solution of lithium iodate near room temperature with a density of 1.5-1.55, and get 680 milliliters of this lithium iodate solution and place it in a crystallizer (previously placed in a crystallizer) Lithium iodate seed crystals are fixed at the bottom of the container), using Huitian 906 silica gel to bond a three-layer structure composed of stainless steel mesh-hydrophobic polytetrafluoroethylene microporous membrane-stainless steel mesh edges, and this three-layer structure Stick on the annular step on the top cover of the crystallizer (the top cover of the crystallizer is processed into a 5 mm annular step in advance). The PTFE microporous membrane has a pore size of 1 micron and an evaporation area of ​​9 cubic centimeters. Use this three-layer structure to seal the crystallizer, and raise the temperature to 70°C. As time goes on, the so...

Embodiment 3

[0034] Take the growth lithium iodate crystal as an example: Take the growth lithium iodate crystal as an example: prepare a saturated solution of lithium iodate near room temperature with a density of 1.5-1.55, and get 680 milliliters of this lithium iodate solution and place it in a crystallizer (previously placed in a crystallizer) Lithium iodate seed crystals are fixed at the bottom of the container), using Huitian 906 silica gel to bond a three-layer structure composed of stainless steel mesh-hydrophobic polytetrafluoroethylene microporous membrane-stainless steel mesh edges, and this three-layer structure Stick on the ring step on the top cover of the crystallizer (the top cover of the crystallizer is processed into a 5mm ring step in advance). The pore diameter of the polytetrafluoroethylene microporous membrane is 0.8 microns, and the evaporation area is 9 cubic centimeters. Use this three-layer structure to seal the crystallizer, and raise the temperature to 70°C. As ...

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Abstract

The invention discloses a method for controlling the growth rate of a solution crystal. The method adopts a three-layer structure consists of a stainless steel screen, a drainage type microporous filter membrane and a stainless steel screen as a sealing member on a top cover of a crystallizer, and makes use of the air permeable and watertight function of the sealing member to control the growth rate of the crystal through a solution evaporation method. As the method uses the three-layer structure which consists of the stainless steel screen, the drainage type microporous filter membrane and the stainless steel screen on the top cover of the crystallizer to seal the crystallizer, vapor of a solvent can pass through the drainage type microporous filter membrane, while liquidized water cannot pass through the filter membrane. Therefore, the problem of the leakage of a growth liquid is solved, and simultaneously the growth rate of the crystal is controlled through the control on the solution temperature, the sectional area of a seed crystal, the aperture size and area size of the microporous filter membrane, and the dosage of an adsorbent. Furthermore, the requirements on the sealing performance of the crystallizer are also met. A single crystal with better crystallization quality is obtained through the setting of the seed crystal area, the growth temperature, the evaporate aperture and area of the microporous filter membrane, and the dosage of the adsorbent.

Description

technical field [0001] The invention relates to the field of material science, in particular to a method for controlling the growth rate of solution crystals. Background technique [0002] Crystal growth under space microgravity is an important means to study the principles and methods of crystal growth without natural convection. For binary or multi-element crystal systems with impure components, and crystals with greatly different composition densities, when growing under the ground gravity field, the components in the crystals are unevenly distributed due to component segregation, stratification, etc., resulting in growth stripes, etc. defects, and the gravity-driven natural convection disappears when growing under microgravity conditions, so these defects can be reduced or eliminated, so as to obtain high-quality single crystals; at the same time, the effect of microgravity conditions on doping components in the main component can also be studied effect on solubility. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/04
Inventor 宋友庭陈万春陈小龙王皖燕
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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