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Preparation method of low temperature phase barium metaborate nano powder

A technology of barium metaborate and nanopowder, which is applied in the direction of borate, boron oxide, etc., can solve the problems of optical inhomogeneity, large temperature gradient, and difficulty in growing large-sized crystals, and achieve easy control of process parameters, The preparation process is simple and the production cost is low

Inactive Publication Date: 2005-09-21
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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Problems solved by technology

But there are also the following problems: in order to avoid the occurrence of phase transition, a large temperature gradient is often used, resulting in optical inhomogeneity and difficulty in growing large-sized crystals; it is difficult to control the shape of crystal growth; it is impossible to provide commercial products
There is no abrupt point in the phase transition of barium metaborate, and high-temperature solid-state reaction cannot produce pure low-temperature barium metaborate
The people of the Fujian Institute of Physics, Chinese Academy of Sciences used barium hydroxide, boric acid and hydrogen peroxide to prepare BBO nanopowder (patent application number 00135015.3), which requires centrifugal separation and decompression drying, which is not suitable for large-scale production

Method used

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  • Preparation method of low temperature phase barium metaborate nano powder
  • Preparation method of low temperature phase barium metaborate nano powder

Examples

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Embodiment 1

[0016] Ba(NO 3 ) 2 and H 3 BO 3 Dissolve in distilled water respectively, the concentrations of barium ions and boron ions are 0.2mol / L and 1.0mol / L respectively, mix these two solutions according to the ion molar ratio of 1:2, and add excess triethanolamine dropwise under full stirring solution (concentration is 3.0mol / L), a white colloidal precipitate is obtained after completion, and the pH value is about 10. Suction filtration, washed twice with distilled water, washed twice with absolute ethanol, dried at 110°C for 6 hours, ground, then placed in a high temperature furnace, calcined at 700°C for 8 hours to obtain BBO powder with an average particle size of 40 nm.

Embodiment 2

[0018] BaCl 2 and H 3 BO 3 Dissolve in distilled water respectively, the concentrations of barium ions and boron ions are 0.5mol / L and 2.0mol / L respectively, mix the two solutions according to the ion molar ratio of 1:2, and add excess triethanolamine dropwise under full stirring solution (concentration is 3.0mol / L), a white colloidal precipitate is obtained after completion, and the pH value is about 11. Suction filtration, washed twice with distilled water, washed twice with absolute ethanol, dried at 110°C for 6 hours, ground, then placed in a high temperature furnace, calcined at 750°C for 8 hours to obtain BBO powder with an average particle size of 80 nm.

Embodiment 3

[0020] Ba(NO 3 ) 2 and H 3 BO 3 Dissolve in distilled water respectively, the concentrations of barium ions and boron ions are 0.2mol / L and 1.0mol / L respectively, mix the two solutions according to the ion molar ratio of 1:2, and add excess triethylamine dropwise under full stirring. In the amine solution (concentration is 3.0mol / L), a white colloidal precipitate is obtained after completion, and the pH value is about 11. Suction filtration, washed twice with distilled water, washed twice with absolute ethanol, dried at 110°C for 6 hours, ground, then placed in a high temperature furnace, calcined at 700°C for 8 hours to obtain BBO powder with an average particle size of 40 nm.

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Abstract

A method for preparing the nonagglomerate low-temperature phase BBO nanoparticles, belongs to the technical field of fine chemical industry, which comprises the following steps: depositing the aqueous solution of inorganic barium salt and boracic acid by organic amine as a precipitating agent, filtering and drying, calcining at a temperature of 650-850 Deg. C, to get the BBO nanoparticles in the average particle size about 40 nm and without agglomerates and impurity phases. The projecting characteristic of the method is: adopting the inorganic salt as a raw material, needing not to add surfactant and having no use for vacuum drying and centrifugal separating to get the high-purity BBO nanoparticles without agglomerates and impurity phases.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, in particular to a preparation method of low-temperature phase barium metaborate (BBO) nanometer powder. Background technique [0002] Barium metaborate BaB 2 o 4 There are two phases, a high-temperature phase and a low-temperature phase, and the phase transition temperature is 925±5°C. The high-temperature phase barium metaborate has a centered structure and no frequency doubling effect. It is a new type of birefringent crystal. The low-temperature phase barium metaborate (BBO) has a centerless structure and is an excellent nonlinear optical material. The BBO crystal was first discovered and developed by the Fujian Institute of the Structure of Matter, Chinese Academy of Sciences. BBO crystal has a series of advantages: high effective frequency doubling coefficient, wide transmission band, high damage threshold, wide phase matching range, small temperature coefficient of refractive index...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12
Inventor 周有福陈长章洪茂椿李定王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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