Method for quickly compounding barium titanate nano-powder
A barium titanate and nano powder technology, applied in nanotechnology and other directions, can solve problems such as long preparation cycle, and achieve the effects of low cost, simple process and easy operation, and high crystallinity
Inactive Publication Date: 2012-07-18
SHANGHAI UNIV
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Problems solved by technology
The cost of reaction raw materials is low, the process is simple and easy to operate, and overcomes the shortcomings of high-temperature calcination, long preparation cycle, and easy introduction of impurities in the preparation of barium titanate powder in the past.
Method used
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Embodiment 1
[0016] Embodiment one: concrete steps are as follows:
[0017] A. A 0.05M peroxotitanic acid sol was prepared.
[0018] B. Prepare a 0.10M aqueous solution of barium hydroxide.
[0019] C. The above-mentioned peroxotitanic acid sol and the aqueous solution of barium hydroxide are fully mixed at a molar ratio of 0.5, and the mixed substance is transferred to a closed high-temperature reaction kettle of a microwave sample preparation system. , and crystallized for 10 minutes to obtain barium titanate precipitate.
[0020] D. After the above precipitate was ultrasonically mixed with 0.5 M formic acid, it was dialyzed in deionized water to remove excess formic acid.
[0021] E. Dry the above precipitate at 80°C to obtain barium titanate nanopowder.
Embodiment 2
[0022] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that the molar ratio used is Ti / Ba=1.
Embodiment 3
[0023] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that the temperature of microwave water heating is 160°C.
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Abstract
The invention relates to a method for quickly compounding the barium titanate nano-powder, belongs to the technical field of preparing the electrode material. The method of the invention comprises the following steps: adopting a microwave assistant hydrothermal method, namely mixing the self-made PTA (purified terephthalic acid) sol and barium hydroxide solution; putting the mixed solution in a closed high-temperature reaction kettle of a microwave sample preparation system; and obtaining the mixture of the nano-grade barium titanate and barium carbonate through the microwave action in a short time under a low temperature condition. The obtained product is subjected to ultrasonic cleaning with an acid solution of a certain concentration, dialysis with de-ionized water and drying, and then the barium titanate nano-powder with high purity and high degree of crystallization is obtained. The method of the invention combines the advantages of a hydrothermal method and a microwave method. The grain diameter of the obtained powder is less than 100nm; the preparation process does not introduce surfactant and does not need high temperature sintering; and the obtained powder is widely applied to the fields of electronic ceramics, photocatalysis and the like.
Description
technical field [0001] The invention relates to a rapid preparation method of nano-scale barium titanate powder, which belongs to the field of low-temperature preparation of electronic materials. The preparation process is simple and fast, and the energy consumption is low. The prepared barium titanate powder has high purity and crystallinity and narrow particle size distribution. Background technique [0002] Barium titanate (BaTiO 3 ) is an important electronic body ceramic material, which has important applications in military electronics and civilian electrical appliances. Generally, the preparation methods of barium titanate powder are divided into high-temperature solid-phase method and liquid-phase synthesis method. Among them, the high-temperature solid-phase method is the traditional preparation method of barium titanate powder, but due to its high reaction temperature, large product particles, and difficult control of Ti / Ba ratio, it is far from meeting the devel...
Claims
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Login to View More IPC IPC(8): C04B35/468C04B35/626B82Y40/00
Inventor 施利毅赵尹李薇薇袁帅王竹仪方建慧
Owner SHANGHAI UNIV