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Strontium magnesium niobate doped modified sodium bismuth titanate-based energy storage ceramic material and preparation method thereof

A technology based on sodium bismuth titanate and strontium magnesium niobate, which is applied in the field of ceramic capacitor materials, can solve the problems of low breakdown field strength and small polarization difference, and achieves the effects of low cost, large output, and a green preparation process.

Active Publication Date: 2020-11-24
XIAN TECHNOLOGICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to problems such as low breakdown field strength and small polari

Method used

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  • Strontium magnesium niobate doped modified sodium bismuth titanate-based energy storage ceramic material and preparation method thereof
  • Strontium magnesium niobate doped modified sodium bismuth titanate-based energy storage ceramic material and preparation method thereof
  • Strontium magnesium niobate doped modified sodium bismuth titanate-based energy storage ceramic material and preparation method thereof

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preparation example Construction

[0030] The invention provides a method for preparing a bismuth sodium titanate-based energy storage ceramic material doped with strontium niobate magnesium oxide, which comprises the following steps:

[0031] (1) Weigh Bi according to the ratio of the stoichiometric formula 2 o 3 、Na 2 CO 3 、TiO 2 , SrCO 3 , MgO and Nb 2 o 5 Mix, and follow the principle of "a large amount - a small amount - a large amount"; then carry out ball milling, the process of ball milling can refine the powder, and at the same time make the mixing of various materials more uniform. Among them, ball milling takes 8 to 12 hours, and the speed of ball milling is 330 to 400 r / min. After ball milling, dry the mixture at 85-100°C for 2-4 hours; sieve through a 60-120 mesh sieve to obtain the general formula of chemical composition (1-x)(Bi 0.5 Na 0.5 )TiO 3 -xSr(Mg 0.3334 Nb 0.6666 )O 3 Powder, said 0≦x≦0.20.

[0032] (2) Add the above-mentioned mixture into the crucible, after compaction, put...

Embodiment 1

[0037] In this example, strontium niobate magnesium doped modified bismuth sodium titanate based energy storage ceramics has a chemical composition of 0.90 (Bi 0.5 Na 0.5 )TiO 3 -0.10Sr(Mg 0.3334 Nb 0.6666 )O 3 , the steps of its preparation method include:

[0038] (1) Weigh Bi according to the ratio of the stoichiometric formula 2 o 3 、Na 2 CO 3 、TiO 2 , SrCO 3 , MgO and Nb 2 o 5 Mix, and follow the principle of "a large amount - a small amount - a large amount"; then perform ball milling, wherein the ball milling time is 12 hours, and the rotational speed of the ball milling is 350r / min. After ball milling, the mixture was dried at 85°C for 2 hours; sieved with a 60-mesh sieve to obtain 0.90 (Bi 0.5 Na 0.5 )TiO 3 -0.10Sr(Mg 0.3334 Nb 0.6666 )O 3 Powder.

[0039] (2) Add the above mixture into the crucible, place it in a sintering furnace, raise the temperature to 850°C and keep it warm for 2h, the heating rate of pre-firing is 3°C / min, and then cool down ...

Embodiment 2

[0046] According to the formula (1-x) (Bi 0.5 Na 0.5 )TiO 3 -xSr(Mg 0.3334 Nb 0.6666 )O 3 , except that the value of x is changed, other steps are the same as in Example 1. Calculate the required amount of each raw material, and weigh it with an electronic balance, and the weighing is accurate to 3 decimal places.

[0047] The hysteresis loop tests of different electric field strengths at room temperature were carried out on the energy storage ceramic samples prepared in Example 2, as shown in figure 2 As shown, with the increase of the doping amount of strontium magnesium niobate, the recyclable energy storage density shows a trend of first increasing and then decreasing.

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Abstract

The invention discloses a strontium magnesium niobate doped modified sodium bismuth titanate-based energy storage ceramic material and a preparation method thereof, and belongs to the technical fieldof electronic ceramics. The formula of the strontium magnesium niobate doped modified sodium bismuth titanate-based energy storage ceramic material is as follows: (1-x) (Bi0.5Na0.5) TiO3-xSr (Mg0.334Nb0.6666) O3, wherein x is more than or equal to 0 and less than or equal to 0.20; the preparation method adopting a solid-phase sintering method comprises the following steps: weighing raw material according to a stoichiometric formula, and uniformly mixing to form a full ingredient; sequentially carrying out ball milling, drying, grinding and sieving on the full ingredients to form sieved materials; and pressing the sieved material into a sample, and sintering the sample to successfully prepare the compact and uniform energy storage ceramic with small crystal grains. The energy storage ceramic prepared by the method disclosed by the invention can obtain recyclable energy storage density of 1.59 J/cm < 3 > under higher breakdown field strength (140KV/cm); and the material has the advantages of low cost, high yield, simple preparation process, environmental friendliness and the like, and is likely to become an important candidate material for the lead-free energy storage capacitor material.

Description

technical field [0001] The invention relates to the technical field of ceramic capacitor materials, in particular to a strontium niobate-magnesium-doped modified bismuth-sodium titanate-based energy storage ceramic material and a preparation method thereof. Background technique [0002] In recent years, under the background of the rapid development of the electronics industry, energy storage components continue to develop in the direction of lead-free, miniaturized, high energy storage density and high energy storage efficiency. Ceramic dielectric materials are widely used in pulse power systems because of their high dielectric constant, good thermal stability, and outstanding mechanical properties, and the stored electrical energy can be released in a very short time (as short as nanoseconds). middle. [0003] Among them, bismuth-sodium titanate-based ceramic materials have strong ferroelectricity (remanent polarization at room temperature Pr=38μC / cm 2 ), small dielectric...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622C04B35/63
CPCC04B35/475C04B35/6303C04B35/622C04B2235/3201C04B2235/3206C04B2235/3213C04B2235/3232C04B2235/3251C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567C04B2235/6562Y02E60/14
Inventor 戴中华张文婧张凡博刘卫国
Owner XIAN TECHNOLOGICAL UNIV
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