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Preparation method of rare earth Eu and Dy doped strontium magnesium silicate powder

A technology of strontium magnesium silicate and powder, which is applied in the field of materials science, can solve the problems of low solid content of silica sol, high price, and difficulty in large-scale promotion, and achieve significant technological progress, low cost, and simple equipment and processes.

Inactive Publication Date: 2016-01-06
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a preparation method of rare earth Eu, Dy-doped strontium magnesium silicate powder, which solves the problem of silica sol in the preparation method of the prior art. Low solid content, high price, technical problems that are difficult to promote on a large scale

Method used

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  • Preparation method of rare earth Eu and Dy doped strontium magnesium silicate powder

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Experimental program
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Effect test

Embodiment 1

[0016] According to the molar ratio of strontium nitrate: magnesium nitrate: europium nitrate: dysprosium nitrate: sodium silicate: urea=1.97:1:0.01:0.02:1:6 ratio, strontium nitrate, magnesium nitrate, europium nitrate, dysprosium nitrate and urea Completely dissolve in deionized water, then pour into sodium silicate dissolved in water, then heat to 90°C with a magnetic stirrer, and after continuous stirring for 1 hour, move the solution directly into a high-temperature sintering furnace preheated to 850°C, With the evaporation of water, it burns violently to obtain a fluffy and foamy product, and its XRD is as follows: figure 1 As shown, it can be seen from the XRD pattern that the product is strontium magnesium silicate Sr 2 MgSiO 7 : Eu, Dy powder.

Embodiment 2

[0018] According to the molar ratio of strontium nitrate: magnesium nitrate: europium nitrate: dysprosium nitrate: sodium silicate: urea = 1.8:0.95:0.1:0.1:1:30, completely dissolve strontium nitrate, magnesium nitrate and urea in deionized water , then pour the sodium silicate dissolved in water into it, and then heat it to 100°C with a magnetic stirrer. After stirring continuously for 0.3 hours, move the solution directly into a high-temperature sintering furnace preheated to 650°C. With the evaporation of water, Combust violently to obtain a fluffy and foamy product, and all the other implementation conditions are the same as in Example 1 to obtain strontium magnesium silicate Sr 2 MgSiO 7 : Eu, Dy powder.

Embodiment 3

[0020] According to the molar ratio of strontium nitrate: magnesium nitrate: europium nitrate, dysprosium nitrate, sodium silicate: citric acid = 1.98:2:0.01:0.01:2:3, completely dissolve strontium nitrate, magnesium nitrate and citric acid in the Then pour the sodium silicate dissolved in the water into the ionized water, and then heat it to 95°C with a magnetic stirrer. After stirring continuously for 0.5 hours, move the solution directly into a high-temperature sintering furnace preheated to 700°C. Evaporate, burn violently, obtain fluffy foamy product, all the other implementation conditions are the same as embodiment 1, have obtained SrMgSiO 4 : Eu, Dy powder.

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Abstract

The invention discloses a preparation method of rare earth Eu and Dy doped strontium magnesium silicate powder. The preparation method comprises the steps that strontium nitrate, magnesium nitrate, europium nitrate, dysprosium nitrate, sodium silicate and a reducing agent are weighed according to the mole ratio being 1.8-1.98:0.95-2:0.01-0.1:0.01-0.1:1-2:3-30; the sodium silicate is dissolved in water to form a sodium silicate water solution, then the strontium nitrate, the magnesium nitrate, the europium nitrate, the dysprosium nitrate and the reducing agent are completely dissolved in deionized water, then the sodium silicate water solution is poured into the mixture, a magnetic stirrer is used for heating to reach 90-100 DEG C, stirring continuously is carried out for 0.3-1 h, then the solution is directly shifted into a high-temperature sintering furnace preheated to reach 650-900 DEG C, fierce combustion is carried out along with moisture evaporation, and the fluffy foam product is obtained. The sodium silicate with the relatively low cost is adopted as a raw material, the cost is low, and the technology is simple.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to an inorganic non-metal ultrafine powder, in particular to a strontium magnesium silicate, specifically a method for preparing a rare earth Eu and Dy doped strontium magnesium silicate powder. Background technique [0002] Long afterglow luminescent materials are materials that can absorb and store the energy of external light radiation during the day, and slowly release the stored energy in the form of visible light at night to achieve lighting effects. Compared with sulfide and aluminate long afterglow materials, silicate series long afterglow materials have good chemical stability and strong water resistance. The raw material SiO 2 It is cheap and easy to obtain, so the research and development of silicate-based phosphors have attracted widespread attention from all over the world. [0003] To obtain long afterglow materials, the preparation of the materials is the key. At pr...

Claims

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Application Information

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IPC IPC(8): C09K11/79
Inventor 江国健陈将王拂晓
Owner SHANGHAI INST OF TECH
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