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Method for preparing sodium bismuth titanate spherical powder via two-step hydrothermal method

A technology for preparing sodium bismuth titanate powder and sodium bismuth titanate is applied in chemical instruments and methods, titanium compounds, bismuth compounds, etc., and can solve the problems of high concentration of mineralizers and long time, and achieves simple process, The effect of low cost and broad application prospects

Inactive Publication Date: 2019-01-08
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing research, the synthesis of bismuth sodium titanate nanopowder mainly focuses on the shape control, but the prepared bismuth sodium titanate nanopowder is rarely monodisperse, uniform in particle size, and well-developed spherical. Moreover, the concentration of mineralizer required for preparation is high and the time is long

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  • Method for preparing sodium bismuth titanate spherical powder via two-step hydrothermal method
  • Method for preparing sodium bismuth titanate spherical powder via two-step hydrothermal method
  • Method for preparing sodium bismuth titanate spherical powder via two-step hydrothermal method

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Effect test

Embodiment 1

[0032] Two-step hydrothermal method prepares the method steps of sodium bismuth titanate spherical powder as follows:

[0033] (1) Preparation of titanium dioxide powder by hydrothermal method in the first step:

[0034] (1) Weigh 3.5400g of titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in 30ml of deionized water, stirred until it was completely dissolved, and ammonia water was added dropwise to it, and white suspended matter was produced until the pH of the solution = 10, and a white mixed solution was obtained;

[0035] (2) Transfer the above white mixed solution to a hydrothermal reaction kettle with a polytetrafluoroethylene liner with a thickness of 2mm, the filling degree is 80%, and o C under hydrothermal reaction for 2 h, after cooling to room temperature, the product was taken out, washed repeatedly with deionized water to neutrality, and dried in an oven to obtain titanium dioxide nanopowder whose crystalline phase was anatase phase, and the titanium dioxide nanopo...

Embodiment 2

[0041] Two-step hydrothermal method prepares the method steps of sodium bismuth titanate spherical powder as follows:

[0042] (1) Preparation of titanium dioxide powder by hydrothermal method in the first step:

[0043] (1) Weigh a certain amount of titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in deionized water, stirred until it was completely dissolved, then ammonia water was added dropwise to it, and white suspended matter was produced until the pH of the solution = 8, and a white mixed solution was obtained;

[0044] (2) Transfer the above white mixed solution to a hydrothermal reaction kettle with a polytetrafluoroethylene liner with a thickness of 3mm, the filling degree is 80%, and oC under hydrothermal reaction for 6 h, after cooling to room temperature, the product was taken out, washed repeatedly with deionized water to neutrality, and dried in an oven to obtain titanium dioxide nanopowder whose crystalline phase was anatase phase, and the titanium dioxide nanopo...

Embodiment 3

[0051] Two-step hydrothermal method prepares the method steps of sodium bismuth titanate spherical powder as follows:

[0052] (1) Preparation of titanium dioxide powder by hydrothermal method in the first step:

[0053] (1) Weigh a certain amount of titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in deionized water, stirred until it was completely dissolved, and ammonia water was added dropwise to it, and white suspended matter was produced until the pH of the solution = 12, and a white mixed solution was obtained;

[0054] (2) Transfer the above white mixed solution to a hydrothermal reaction kettle with a polytetrafluoroethylene liner with a thickness of 2mm, the filling degree is 80%, and o C under hydrothermal reaction for 4 h, after cooling to room temperature, the product was taken out, washed repeatedly with deionized water to neutrality, and dried in an oven to obtain titanium dioxide nanopowder whose crystalline phase was anatase phase, and the titanium dioxide nanop...

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Abstract

The invention relates to a method for preparing sodium bismuth titanate spherical powder via a two-step hydrothermal method. According to the method, in the first step, a titanium dioxide powder is prepared through a primary hydrothermal method, and in the second step, a sodium bismuth titanate powder is prepared through a secondary hydrothermal method, so that a uniformly dispersed spherical sodium bismuth titanate powder with a particle size of 180-220 nm is obtained. The preparation method has the advantages of being low in synthesis temperature and short in reaction time, and is simple inprocess, low in cost and small in pollution; and the prepared sodium bismuth titanate powder is high in degree of sphericity, uniform in particle size and favorable in dispersion, can be used for preparing high-performance galvanized iron-free voltage electric ceramics, and has a wide application prospect in the field of micro electronic devices.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a perovskite lead-free piezoelectric ceramic nano-powder and its preparation field, in particular to a method for preparing bismuth sodium titanate spherical powder by a two-step hydrothermal method. Background technique [0002] Piezoelectric materials are functional materials that realize the mutual conversion of mechanical energy and electrical energy, and are widely used in the fields of sensors, storage, and energy harvesting. In recent years, nano- or micro-powders of perovskite ferroelectric materials have attracted widespread attention because of related devices made of them, such as ferroelectric storage capacitors, energy harvesting devices, pressure sensors, piezoelectric nanogenerators, nano Electromechanical systems have become more miniaturized and integrated. PZT is the most representative piezoelectric ceramic with excellent piezoelectric properties. However, t...

Claims

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Application Information

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IPC IPC(8): C01G29/00C01G23/053C04B35/475C04B35/626
CPCC01G23/0532C01G29/006C01P2004/32C01P2004/52C01P2004/62C04B35/475C04B35/62675
Inventor 张帆王超王占杰
Owner SHENYANG POLYTECHNIC UNIV
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