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Method for synthesizing Gd3Ga5O12(GGG) transparent ceramic nano crystals

A technology of transparent ceramics and nanocrystals, applied in the field of nanomaterials, can solve the problems of wide distribution of nanocrystals, high calcination temperature, and long holding time, and achieve the effects of improving sintering activity, good dispersion, and preventing agglomeration

Inactive Publication Date: 2009-12-02
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0003] However, the GGG transparent ceramic nanocrystalline powder prepared by the prior art has a higher calcination temperature or too long holding time, resulting in a wider particle size distribution of the nanocrystals or more serious particle agglomeration

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  • Method for synthesizing Gd3Ga5O12(GGG) transparent ceramic nano crystals
  • Method for synthesizing Gd3Ga5O12(GGG) transparent ceramic nano crystals

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Embodiment 1

[0022] The operation steps are as follows:

[0023] 1. The preparation of the solution: 7.322g Ga 2 o 3 Dissolve in 300ml concentrated HCl and HNO 3 in the mixture (wherein V(HNO 3 ): V (HCl) = 3: 1) to get Ga (NO 3 ) 3 Solution; 8.496g Gd 2 o 3 Soluble in 1mol / L HNO 3 Gd(NO 3 ) 3 solution. The above two solutions were mixed to a constant volume of 500ml to prepare a mixed solution with a concentration of 0.10mol / L.

[0024] 2. Preparation of the precursor: Slowly add ammonia water dropwise to the mixed solution under strong stirring, and adjust the pH value to 2, so that the Ga 3+ 、Gd 3+ Simultaneously precipitated evenly. Then slowly drop the concentration of 2.0mol / LNH 4 HCO 3 solution, control the pH value to 8 so that the precipitation reaction is complete and does not dissolve. After the titration, continue to stir for 1 h, let it stand until the particles settle, take a little supernatant, and add ammonia water dropwise. If no precipitation occurs, it me...

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Abstract

The invention provides a method for synthesizing Gd3Ga5O12(GGG) transparent ceramic nano crystals, which mainly comprises the following steps: weighing Gd2O3 and Ga2O3 in strict accordance with a stoichiometric ratio; dissolving the Gd2O3 in a dilute HNO3 solution and dissolving the Ga2O3 in a mixed solution of concentrated HNO3 and concentrated HCl; uniformly mixing the solutions of the two components to obtain a clear and transparent mixed solution; adding ammonia into the mixed solution, adjusting the pH value of the mixed solution to between 2 and 4, dripping NH4HCO3, controlling the pH value at the end of the reaction to be between 7 and 10 to obtain a precipitate; and subjecting the precipitate to vacuum filtration, washing, drying at a constant temperature and calcining to obtain the GGG ceramic nano crystals. The method is simple in process, low in temperature for synthesizing nano powder, energy-saving, and low in equipment requirement; and the synthesized nano crystals are near-spherical, small in granularity, high in purity and good in dispersivity and are ideal precursor powder for preparing the GGG transparent ceramic. The method provides the GGG ceramic nano powder excellent controllability and feasibility of batch preparation.

Description

technical field [0001] The present invention relates to a kind of Gd 3 Ga 5 o 12 The invention discloses a low-cost preparation method of (GGG) transparent ceramic nanocrystals, which belongs to the technical field of nanometer materials. Background technique [0002] Gadolinium gallium garnet (Gd 3 Ga 5 o 12 , referred to as GGG) belongs to the equiaxed crystal system and has a cubic structure. It is a widely used laser and luminescent matrix material. GGG micropowder can be used to prepare transparent ceramics required for large-scale high-power solid-state laser working materials, thereby replacing single crystal materials that are difficult to prepare due to volatilization. At present, the preparation methods of GGG powder mainly include: solid state reaction synthesis method, sol-gel method, chemical co-precipitation method, etc. Solid state reaction synthesis requires high reaction temperature and long reaction time, and it is difficult to achieve uniform chemic...

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Application Information

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IPC IPC(8): C04B35/622C04B35/50
Inventor 李霞王桂素
Owner QINGDAO UNIV OF SCI & TECH
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