Amorphous fine-particle powder, process for production thereof and perovskite-type barium titanate powder made by using the same
A manufacturing method, perovskite-type technology, applied in the direction of titanate, alkaline earth metal titanate, chemical instruments and methods, etc., to achieve the effect of stable quality
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Embodiment 1
[0080] At 25°C, 6.67 g of oxalic acid dihydrate was dissolved in 100 ml of ethanol to prepare liquid B.
[0081] On the other hand, 18.22 g of lactic acid and 30 g of pure water were sequentially added little by little to 8.56 g of tetra-n-butyl titanate under stirring at 25° C. to obtain a transparent liquid. Next, 7.75 g of barium hydroxide octahydrate was added and dissolved at 25° C., then diluted with ethanol to prepare 100 ml of liquid A.
[0082] Next, under stirring at 25°C, add liquid A and liquid B dropwise to 100ml of ethanol (liquid C) at the same time. It takes 15 minutes to add the entire amount dropwise. After the dropwise addition, mature for 15 minutes at 25°C to obtain precipitate thing.
[0083] The precipitate was filtered and dried at 80°C to obtain a powder. An electron micrograph of the powder was taken, and the Ba / Ti molar ratio, BET specific surface area, X-ray diffraction, FT-IR, and chlorine content of the powder were measured by ion chromatography...
Embodiment 2
[0101] Calcined 5 g of the amorphous fine particle powder obtained in Example 1 in the air atmosphere at 800° C. for 10 hours, cooled it, and pulverized it with a mortar to obtain barium titanate powder.
[0102] The Ba / Ti molar ratio, average particle size, BET specific surface area, lattice constant ratio (C / A) based on X-ray diffraction, and the ratio near 2θ=24° of the obtained barium titanate were measured based on the fluorescent X-ray method. The presence or absence of barium carbonate peaks (refer to Figure 11 ), chlorine content based on ion chromatography. Table 2 shows various physical properties of the obtained barium titanate powder. In addition, the average particle diameter was obtained as the average value of 200 randomly extracted particles measured at a magnification of 50,000 times. In addition, the electron micrograph is shown in Figure 10 middle.
Embodiment 3
[0112]At 25°C, 6.67 g of oxalic acid dihydrate was dissolved in 100 ml of ethanol to prepare liquid B.
[0113] On the other hand, 18.22 g of lactic acid and 30 g of pure water were sequentially added little by little to 8.56 g of tetra-n-butyl titanate under stirring at 25° C. to obtain a transparent liquid. Next, 7.75 g of barium hydroxide octahydrate was added and dissolved at 25° C., and diluted with ethanol to prepare 100 ml of liquid A. Then, magnesium acetate was dissolved in liquid A at 25° C. to a concentration of 0.2% by weight in terms of MgO relative to the produced barium titanate. Under stirring at 25°C, add liquid A and liquid B dropwise to 100ml of ethanol (solution C) at the same time. It takes 5 minutes to add the entire amount dropwise. After the dropwise addition, mature at 25°C for 15 minutes to obtain a precipitate. The precipitate was filtered and dried at 80°C to obtain a powder.
[0114] Similar to Example 1, electron micrographs were taken, and the ...
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