Preparation method of strontium titanate ceramic with high dielectric constant and frequency stability

A frequency stability, high dielectric constant technology, applied in the field of nanomaterial preparation, can solve the problems of increasing dielectric loss, vacancy defect space charge, relaxor ferroelectricity, etc., to achieve reduced dielectric loss, uniform sample size, The effect of improving density

Active Publication Date: 2022-05-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The study found that the dielectric constant of ceramics can be improved by doping and replacement solid solution modification, but it will bring about relaxation ferroelectricity, vacancy defects and space charges. Thereby increasing its dielectric loss

Method used

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  • Preparation method of strontium titanate ceramic with high dielectric constant and frequency stability
  • Preparation method of strontium titanate ceramic with high dielectric constant and frequency stability
  • Preparation method of strontium titanate ceramic with high dielectric constant and frequency stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1), weigh 1.926g Sr(NO 3 ) 2 Add 39mL deionized water and stir for 18min to obtain solution A;

[0028] (2), 1mL TiCl 4 Slowly drop into solution A, stir well until the solution is completely transparent, and obtain solution B;

[0029] (3), adding 1.248 g of NaOH with a concentration of 8.8 mol / L into solution B, stirring for 1 h, to obtain milky white suspension C;

[0030] (4) Transfer suspension C to a 58mL reaction kettle, and react under high pressure at 188°C for 12h to obtain product D;

[0031] (5) Pour the product D into a centrifuge tube, centrifuge and wash it with deionized water for more than 4 times in a centrifuge until the pH is neutral, and dry it in a vacuum oven at 88°C for 24 hours. Due to insufficient reaction driving force, and Not enough to generate SrTiO 3 Nano powder.

Embodiment 2

[0033] (1), weigh 1.926g Sr(NO 3 ) 2 Add 39mL deionized water and stir for 18min to obtain solution A;

[0034] (2), 1mL TiCl 4 Slowly drop into solution A, stir well until the solution is completely transparent, and obtain solution B;

[0035] (3), adding 1.568 g of NaOH with a concentration of 1.8 mol / L into solution B, stirring for 1 h, to obtain milky white suspension C;

[0036] (4) Transfer suspension C to a 58mL reaction kettle, and react under high pressure at 188°C for 12h to obtain product D;

[0037] (5) Pour the product D into a centrifuge tube, centrifuge and wash it with deionized water for more than 4 times in a centrifuge until the pH is neutral, and dry it in a vacuum oven at 88°C for 24 hours to obtain pure single titanic acid Strontium nanopowder.

Embodiment 3

[0039] (1), weigh 1.926g Sr(NO 3 ) 2 Add 39mL deionized water and stir for 18min to obtain solution A;

[0040] (2), 1mL TiCl 4 Slowly drop into solution A, stir well until the solution is completely transparent, and obtain solution B;

[0041] (3), adding 1.872g of NaOH with a concentration of 1.2mol / L into solution B, stirring for 1h, to obtain milky white suspension C;

[0042] (4) Transfer suspension C to a 58mL reaction kettle, and react under high pressure at 188°C for 12h to obtain product D;

[0043] (5) Pour the product D into a centrifuge tube, centrifuge and wash it with deionized water for more than 4 times in a centrifuge until the pH is neutral, and dry it in a vacuum oven at 88°C for 24 hours to obtain pure single titanic acid Strontium nanopowder.

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Abstract

The invention discloses a preparation method of strontium titanate ceramic with high dielectric constant and frequency stability, which comprises the following steps: taking Sr (NO3) 2, adding deionized water, fully dissolving to obtain a solution A, and dropwise adding TiCl4 into the solution A to obtain a solution B; taking a NaOH solution with the concentration of 1 mol / L-1. 4mol / L, adding the NaOH solution into the solution B, and stirring to obtain a milk white turbid liquid C; transferring the turbid liquid C into a reaction kettle, and reacting at 188 DEG C for 12 hours to obtain a product D; (4) carrying out centrifugal washing on the product D in a centrifugal machine by using deionized water until the pH value is neutral, and carrying out ball milling and drying to obtain SrTiO3 nano powder E; sieving the SrTiO3 nano-powder E by a 128-mesh sieve, and pressing the SrTiO3 nano-powder E into a flaky strontium titanate ceramic blank by a cold isostatic press; and sintering the strontium titanate ceramic blank to obtain the pure strontium titanate ceramic. The dielectric constant of the strontium titanate ceramic is improved, the dielectric loss of the strontium titanate ceramic is reduced, and the strontium titanate ceramic has high frequency stability.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a method for preparing strontium titanate ceramics with high dielectric constant and frequency stability. Background technique [0002] With the improvement of science and technology and living standards, people put forward more stringent requirements for energy storage components, making them gradually develop in the direction of miniaturization, integration and light weight. Capacitors have high power density, wide operating temperature range, fast charging and discharging, and long service life. They can be used in fully automatic warships and hybrid vehicles, but their energy storage density is relatively low. With the practical application requirements of pulse technology, pulse capacitors are required to have high energy storage density and wide temperature stability. For linear materials, the energy storage density is proportional to the square of the dielectric c...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/622C04B35/638
CPCC04B35/47C04B35/622C04B35/638C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/95
Inventor 蒲永平张金波宁亚婷张贤上阳超
Owner SHAANXI UNIV OF SCI & TECH
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