Method for preparing nano barium-strontium titanate powder by adopting hydrothermal method

A technology of nano-titanium and hydrothermal method is applied in the field of preparation of barium strontium titanate powder, which can solve the problem of uneven particle size distribution of barium strontium titanate powder, and achieve the effect of avoiding grain growth and mixing of impurities.

Inactive Publication Date: 2010-07-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiency of uneven particle size distribution of barium strontium titanate powder prepared by the prior art method, the present invention provides a method for preparing nano

Method used

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  • Method for preparing nano barium-strontium titanate powder by adopting hydrothermal method
  • Method for preparing nano barium-strontium titanate powder by adopting hydrothermal method
  • Method for preparing nano barium-strontium titanate powder by adopting hydrothermal method

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Embodiment 1

[0013] Embodiment 1, embodiment 1, weighing 1molSr (NO 3 ) 2 , 1molBa(NO 3 ) 2 , 1.2molTiO 2 , and then add 2mol / L mineralizer NaOH 50ml batching, directly into the autoclave lined with polytetrafluoroethylene, then add 31ml of deionized water, while stirring gently with a glass rod, followed by 1 ℃ / min Speed ​​up to a hydrothermal temperature of 160°C and keep warm for 24 hours. After the heat preservation is over, cool down to room temperature with the furnace, and repeatedly rinse and filter the obtained powder with deionized water until the pH value of the filtered deionized water is neutral. Dry in oven. The microstructure of the prepared BST powder was analyzed by Hitach S-530 scanning electron microscope.

[0014] figure 1 It is the SEM photo of the BST powder obtained when r(Ba / Ti)=1.2. It can be seen from the figure that the particle size of the prepared BST powder is about 120nm, and the size is relatively uniform.

Embodiment 2

[0015] Embodiment 2, weighing 1molSr (NO 3 ) 2 , 1molBa(NO 3 ) 2 , 1.4molTiO 2 , and then add 3mol / L mineralizer KOH50ml ingredients, directly into the autoclave lined with polytetrafluoroethylene, then add 31ml of deionized water, while stirring gently with a glass rod, and then at a speed of 3°C / min Raise the temperature to a hydrothermal temperature of 140°C and keep the temperature for 12 hours. After the heat preservation is over, cool down to room temperature with the furnace, and repeatedly rinse and filter the obtained powder with deionized water until the pH value of the filtered deionized water is neutral. Dry in oven. The microstructure of the prepared BST powder was analyzed by Hitach S-530 scanning electron microscope.

[0016] figure 2 It is the SEM photo of the BST powder obtained when the Ba / Ti ratio r(Ba / Ti)=1.4. It can be seen from the figure that the particle size of the prepared BST powder is about 150nm, and the size is relatively uniform.

Embodiment 3

[0017] Embodiment 3, weighing 1molSr (NO 3 ) 2 , 1molBa(NO 3 ) 2 , 1.6molTiO 2 , and then add 4mol / L mineralizer NaOH 50ml batching, directly into the autoclave lined with polytetrafluoroethylene, then add 31ml of deionized water, while stirring gently with a glass rod, followed by 4 ℃ / min Speed ​​up to a hydrothermal temperature of 120°C and keep warm for 36 hours. After the heat preservation is over, cool down to room temperature with the furnace, and repeatedly rinse and filter the obtained powder with deionized water until the pH value of the filtered deionized water is neutral. Dry in oven. The microstructure of the prepared BST powder was analyzed by Hitach S-530 scanning electron microscope.

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Abstract

The invention discloses a method for preparing nano barium-strontium titanate powder by adopting a hydrothermal method, which is used for solving the technical problem of large granularity of the barium-strontium titanate powder prepared by a method of the prior art. The method comprises the following steps of: adding strontium nitrate, barium nitrate, anatase phase titanium oxide and a mineralizer into a high-pressure kettle; then adding deionized water and stirring; later on, raising the temperature to a hydrothermal temperature according to a certain speed and preserving heat; after heat preservation time arrives, furnace cooling to room temperature; and then repeatedly washing and filtering by using deionized water and drying. Because the barium-strontium titanate powder is prepared by adopting the hydrothermal method, the barium-strontium titanate powder with uniform size distribution is obtained through controlling different barium-titanium proportions, and moreover, the defects of grain growth, impurity mixing, and the like easily caused in a sintering process are overcome.

Description

technical field [0001] The invention relates to a method for preparing barium strontium titanate (hereinafter referred to as BST) nano powder, in particular to a method for preparing nano barium strontium titanate powder by a hydrothermal method. Background technique [0002] The document "S.B.Deshpande, Y.B.Khollam, S.V. Bhoraskar et al., Synthesis and characterization of microwave-hydrothermally derived Bal-xSrxTiO3 powders, Materials Letters 59(2005) 293-296" discloses a method for preparing barium strontium titanate powder by microwave hydrothermal method However, the particle size of the obtained powder is in the range of micron and submicron, and the SEM characterization shows that the particle size distribution is not uniform, so it is still not up to the standard. To the purpose of industrialized production and use. Contents of the invention [0003] In order to overcome the deficiency of uneven particle size distribution of barium strontium titanate powder prepar...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/465
Inventor 樊慧庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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