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A kind of preparation method of flaky strontium barium titanate powder material

A technology of barium strontium titanate and powder materials, which is applied in the field of preparation of flaky barium strontium titanate powder, which can solve the problems of cumbersome preparation process, easy agglomeration of powder, and high requirements for preparation equipment

Active Publication Date: 2020-04-03
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies in the prior art that the preparation process is cumbersome, the obtained powder is easy to agglomerate, and has high requirements for preparation equipment, the present invention proposes a preparation method of flaky strontium barium titanate powder material

Method used

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  • A kind of preparation method of flaky strontium barium titanate powder material
  • A kind of preparation method of flaky strontium barium titanate powder material
  • A kind of preparation method of flaky strontium barium titanate powder material

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Embodiment 1

[0028] A kind of preparation method of flaky strontium barium titanate, with atomic composition as Ba 0.6 Sr 0.4 TiO 3 The strontium barium titanate is taken as an example. The two-step molten salt method is used to first prepare the flake bismuth titanate precursor, and then use the analytically pure barium carbonate and strontium carbonate powder and the bismuth titanate precursor as reactants, according to Ba 0.6 Sr 0.4 TiO 3 Molar ratio ingredients, using the liquid environment provided by molten salt melting to carry out topological chemical crystallite transformation reactions, and finally synthesize flaky Ba 0.6 Sr 0.4 TiO 3 Powder. The specific implementation steps are as follows:

[0029] Step 1: Prepare the mixture of bismuth titanate precursor. Weigh and analyze pure bismuth trioxide, titanium dioxide, sodium chloride and potassium chloride powder, wherein the mol ratio of bismuth trioxide and titanium dioxide is 2:3, and the mass ratio of sodium chloride an...

Embodiment 2

[0042] A kind of preparation method of flaky strontium barium titanate, with atomic composition as Ba 0.6 Sr 0.4 TiO 3 The strontium barium titanate is taken as an example. The two-step molten salt method is used to first prepare the flake bismuth titanate precursor, and then use the analytically pure barium carbonate and strontium carbonate powder and the bismuth titanate precursor as reactants, according to Ba 0.6 Sr 0.4 TiO 3 Molar ratio ingredients, using the liquid environment provided by molten salt melting to carry out topological chemical crystallite transformation reactions, and finally synthesize flaky Ba 0.6 Sr 0.4 TiO 3 Powder. The specific implementation steps are as follows:

[0043] Step 1: Prepare the mixture of bismuth titanate precursor. Weigh and analyze pure bismuth trioxide, titanium dioxide, sodium chloride and potassium chloride powder, wherein the mol ratio of bismuth trioxide and titanium dioxide is 2.1:3, and the mass ratio of sodium chloride ...

Embodiment 3

[0053] A kind of preparation method of flaky strontium barium titanate, with atomic composition as Ba 0.6 Sr 0.4 TiO 3 The strontium barium titanate is taken as an example. The two-step molten salt method is used to first prepare the flake bismuth titanate precursor, and then use the analytically pure barium carbonate and strontium carbonate powder and the bismuth titanate precursor as reactants, according to Ba 0.6 Sr 0.4 TiO 3 Molar ratio ingredients, using the liquid environment provided by molten salt melting to carry out topological chemical crystallite transformation reactions, and finally synthesize flaky Ba 0.6 Sr 0.4 TiO 3 Powder. The specific implementation steps are as follows:

[0054] Step 1: Prepare the mixture of bismuth titanate precursor. Weigh and analyze pure bismuth trioxide, titanium dioxide, sodium chloride and potassium chloride powder, wherein the mol ratio of bismuth trioxide and titanium dioxide is 2.2:3, and the mass ratio of sodium chloride ...

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Abstract

The invention discloses a preparation method of a sheet shape barium strontium titanate powder material. A two step molten-salt growth method is adopted. At first, a sheet shape bismuth titanate precursor is prepared, and then the prepared bismuth titanate precursor, barium carbonate powder, and strontium carbonate powder are taken as the primary reactants to prepare the sheet shape barium strontium titanate powder material. The raw materials are easily available, cheap, nontoxic, and noncorrosive and are harmless to human body, and the requirements on equipment are low. At the same time, the preparation method has the characteristics that the technology is simple, the technology parameters can be easily controlled, the cost is low, and the industrialization is easy. Furthermore, the obtained powder sheet has good and stable morphology.

Description

technical field [0001] The invention relates to the technical field of powder preparation in material science, in particular to a method for preparing flaky strontium barium titanate powder. Background technique [0002] Barium strontium titanate is strontium titanate (SrTiO) with a typical perovskite structure 3 ) and barium titanate (BaTiO 3 ) formed a solid solution, which has high dielectric tunability, high insulation resistance, low dielectric loss and high capacitance temperature stability, and can be changed in a wide range by changing the barium / strontium (Ba / Sr) molar ratio of the material The advantages of adjusting the dielectric constant and Curie temperature of the material within a certain range, such as G.X.Hu et al. studied the effect of magnesium aluminate content on barium strontium titanate (Ba 0.6 Sr 0.4 TiO 3 ) The effect of dielectric properties. The results show that when the magnesium aluminate content is 30wt%, the composite material maintains ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3236
Inventor 高峰王利张可娜王敏秦梦婕张波刘红莉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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