High-specific-surface-area nano barium stannate preparation method

A high specific surface area, barium stannate technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as large-scale application limitations, high equipment requirements, and affecting photoelectric performance. Achieve the effects of easy large-scale industrial production, good repeatability, and shortened reaction time

Inactive Publication Date: 2016-03-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The traditional preparation method of barium stannate is based on BaCO 3 and SnO 2 As a raw material, it is obtained by high-temperature calcination (>1200°C), but the product obtained by this method has large particles, severe agglomeration, and is easy to introduce impurities, which greatly affects its photoelectric performance.
In order to improve the performance of barium stannate powder, wet synthesis of BaSnO 3 It has been greatly developed, and the particle uniformity of the product obtained by the oxalate co-precipitation method is greatly improved, but the

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[0019] with SnCl 4 ·5H 2 O is the tin source, which is dissolved in a certain amount of hydrogen peroxide solution with a mass concentration of 10% to 70%, and the pH is adjusted to 7 to 12 with ammonia water with a mass concentration of 28%, so that the SnCl in the solution 4 The final concentration of 0.02 ~ 0.1mol / L, add BaCO to the above solution 3 Powder, so that the Ba / Sn molar ratio is between 0.95:1 and 1.05:1, stir and react at 20-100°C for 0.5-24h, filter and wash until the pH of the filtrate is 6.5-7.5, dry at 60-120°C for 5- After 24 hours, the obtained powder is calcined at 500-800° C. for 0.5-4 hours to obtain high-purity barium stannate nanoparticles. The prepared BaSnO 3 See Examples 1-27 for details.

[0020] Table 1. Barium stannate nanoparticles prepared under different synthesis conditions

[0021]

[0022]

[0023] Note: The grain size in Table 1 is calculated by the Scherrer formula; the specific surface area in Table 1 is measured by a physica...

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Abstract

The present invention discloses a high-specific-surface-area nano barium stannate preparation method, SnCl4.5H2O as a source of tin is dissolved in a 10% to 70% hydrogen peroxide solution, aqueous ammonia is used for adjusting pH to 7 to 12, barium carbonate is added as a barium source, and reaction is performed at 20-100 DEG C for 0.5-24h; and high purity barium stannate nanoparticles can be obtained by filtering, washing and drying, and then calcining the resulting powder at 500 DEG C. The raw materials are readily available and inexpensive, the operation method is simple, repeatability is good, the preparation method is low in reaction condition requirements, large-scale industrial production is easy, the obtained product is high in purity, good in crystallinity, small in particle size and narrow in distribution, the specific surface area is up to 80m<2> / g or more, and the high-specific-surface-area nano barium stannate fills gaps in the market, and has good market prospects.

Description

technical field [0001] The invention relates to a method for preparing a ceramic material, in particular to a method for preparing nano barium stannate with a high specific surface area. Background technique [0002] Barium stannate (BaSnO 3 ) is a perovskite-type ceramic material that has attracted extensive attention because of its good dielectric properties, optical properties, and thermal stability. Pure phase or doped BaSnO 3 Often used as thermally stable capacitors, dielectric ceramic components, La-doped BaSnO 3 is a good transparent conductor oxide (TCO); in addition, BaSnO 3 For various gases such as CO, NO x ,O 2 ,CO 2 ,H 2 O,H 2 ,C 2 h 5 OH,CH 3 SH,CH 4 It is very sensitive to liquefied petroleum gas and is an excellent gas-sensitive material. Pure phase BaSnO 3 The bandgap width is 3.1ev, and it has a good response ability to light. Its photocatalytic properties have become a research hotspot. When it is used as a material to make a dye-sensitized ...

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Application Information

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IPC IPC(8): C04B35/457C04B35/626C01G19/00B82Y30/00
Inventor 黄传德王晓东张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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