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A kind of magnesium-doped strontium titanate ceramic powder and its preparation method and application

A technology of ceramic powder and magnesium titanium, which is applied in the field of preparation of ceramic powder materials, can solve problems such as large temperature coefficient, dielectric loss, and lack of shape control, and achieve good crystallinity

Active Publication Date: 2021-08-17
LULIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has some defects: dielectric loss, large temperature coefficient, and high Curie temperature. However, if we dope some elements in strontium titanate, it can be modified by doping to become the matrix of inorganic non-metallic functional materials. And the main crystal phase, which will greatly change the performance of the material, so that its various properties have been significantly improved
[0005] Patent 201611047109.6, a rod-shaped Mg 2+ doped SrTiO 3 Synthetic method, recorded a rod-shaped NaTi 3 o 7 , strontium hydroxide and soluble magnesium salt for hydrothermal reaction to obtain rod-shaped magnesium-doped strontium titanate. In this patent, rod-shaped NaTi is directly used 3 o 7 React with magnesium salt to make magnesium ions doped to the rod-shaped NaTi 3 o 7 surface, and no topographical control

Method used

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  • A kind of magnesium-doped strontium titanate ceramic powder and its preparation method and application
  • A kind of magnesium-doped strontium titanate ceramic powder and its preparation method and application
  • A kind of magnesium-doped strontium titanate ceramic powder and its preparation method and application

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Experimental program
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Embodiment 1

[0065] The preparation of embodiment 1 Sakyamuni-doped magnesium-doped strontium titanate

[0066] Anhydrous SrCl 2 and MgCl 2 Soluble in ultrapure water, TiCl 4 Dissolve in 0.3mol / L HCl solution, and make 0.5mol / L solutions respectively. Moore ratio [Sr 2+ ]:[Mg 2+ ]+[Ti 4+ ] = 1.0, [Mg 2+ ]:[Mg 2+ ]+[Ti 4+ ]=0.02 pipette the above-mentioned SrCl respectively 2 solution 2.04mL and MgCl 2 Solution 0.04mL, 2.0mLTiCl 4 Solution, 1.0mL glycerol, mix well, slowly add 30mL0.6mol / L NaOH solution, mix well, place in a high-pressure reaction kettle lined with tetrafluoroethylene, keep the total volume of the solution at 35mL, stir magnetically for 10mins, and fill the kettle , Seal the kettle, heat up to 200°C and react for 6 hours after airtight. After the reaction was completed, the resulting precipitate was filtered, washed, and vacuum-dried at 60°C to obtain a white powder of strontium-doped magnesium titanate in the form of Sakyamuni, marked as SMT1.

Embodiment 2

[0067] The preparation of embodiment 2 spherical magnesium-doped strontium titanate

[0068] The difference from the method in Example 1 is: the concentration of NaOH is 1.5mol / L, the additive is changed from glycerol to 1.5mL ethanol, the reaction time is extended to 8h, and the reaction temperature is changed to 180°C to obtain spherical magnesium-doped titanic acid Strontium, labeled SMT2.

Embodiment 3

[0069] Example 3 Preparation of Sakyamuni-doped magnesium-doped strontium titanate

[0070] Anhydrous SrCl 2 and MgCl 2 Soluble in ultrapure water, TiCl 4 Dissolve in 0.3mol / L HCl solution, and make 0.7mol / L solutions respectively. Moore ratio [Sr 2+ ]:[Mg 2+ ]+[Ti 4+ ] = 1.0, [Mg 2+ ]:[Mg 2+ ]+[Ti 4+ ]=0.02 pipette the above-mentioned SrCl respectively 2 solution 2.1mL and MgCl 2 Solution 0.04mL, 2.0mLTiCl 4 Solution, 1.0mL glycerol, mix well, slowly add 30mL0.6mol / L NaOH solution, mix well, place in a high-pressure reaction kettle lined with tetrafluoroethylene, keep the total volume of the solution at 35mL, stir magnetically for 10mins, and fill the kettle , Seal the kettle, heat up to 200°C for 7 hours after airtight. After the reaction was completed, the resulting precipitate was filtered, washed, and vacuum-dried at 60°C to obtain a white powder of strontium-doped magnesium titanate in the form of Sakyamuni, marked as SMT1.

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Abstract

The invention belongs to the technical field of preparation of ceramic powder materials, and relates to a magnesium-doped strontium titanate ceramic powder and its preparation method and application. Using titanium tetrachloride as the titanium source, sodium hydroxide as the mineralizer, and dilute hydrochloric acid as the hydrolysis inhibitor, react under certain temperature, time, and hydrothermal conditions to obtain magnesium-doped strontium titanate powder, which is analyzed by FT‑IR The product contains no other impurities and is a pure substance. And through XRD, ICP, SEM, TEM, CA, respectively, the internal structure and surface of the final product doped with magnesium strontium titanate were discussed. The results show that the reaction temperature, reaction time, NaOH concentration control, and the addition of glycerol, the obtained magnesium-doped strontium titanate crystal phase is better, the crystal grains have a shape similar to custard fruit, and the particle size distribution is 2.0 μm. The spherical magnesium-doped strontium titanate was obtained by changing the conditions, and the dielectric properties of the two were compared, and it was found that the custard-shaped magnesium-doped strontium titanate had better dielectric responsiveness.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic powder materials, and in particular relates to a magnesium-doped strontium titanate ceramic powder and its preparation method and application. Background technique [0002] Strontium titanate (SrTiO 3 , abbreviated as STO) is an important basic electronic ceramic material, which has excellent properties such as high dielectric constant, ferroelectricity, piezoelectricity and positive temperature coefficient, so it is widely used in many fields. But it also has some defects: dielectric loss, large temperature coefficient, and high Curie temperature. However, if we dope some elements in strontium titanate, it can be modified by doping to become the matrix of inorganic non-metallic functional materials. And the main crystal phase, which will greatly change the performance of the material, so that its various properties have been significantly improved. Therefore, the preparation meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/626
CPCC04B35/47C04B35/626C04B2235/3206C04B2235/444C04B2235/786
Inventor 高淑娟王炎李林枝
Owner LULIANG UNIV
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