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

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

Active Publication Date: 2022-05-17
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to problems such as low breakdown field strength and small polarization difference, the releasable energy storage density is less than 1J / cm 3

Method used

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  • A strontium niobate magnesium doped modified bismuth sodium titanate based energy storage ceramic material and preparation method thereof
  • A strontium niobate magnesium doped modified bismuth sodium titanate based energy storage ceramic material and preparation method thereof
  • A strontium niobate magnesium doped modified bismuth sodium 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 strontium niobate magnesium doped modified bismuth sodium titanate based energy storage ceramic material, comprising 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 it in ...

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 niobate-magnesium-doped modified bismuth-sodium titanate-based energy storage ceramic material and a preparation method thereof, which belong to the technical field of electronic ceramics; The formula of energy ceramic material is: (1‑x)(Bi 0.5 Na 0.5 )TiO 3 ‑xSr(Mg 0.3334 Nb 0.6666 )O 3 , (wherein 0≦x≦0.20); the present invention adopts the solid phase sintering method, weighs the raw materials according to the stoichiometric formula and mixes them uniformly to form the whole batching; the whole batching is sequentially ball milled, dried, ground and sieved to form the sieved material ; The sieved material was pressed into a sample, and the sample was sintered to successfully prepare energy storage ceramics with small grain size and uniform density. The energy storage ceramics prepared by the method of the present invention can obtain 1.59J / cm at a higher breakdown field strength (140KV / cm) 3 The recyclable energy storage density; and has the advantages of low cost, large output, simple preparation process and green environmental protection, and may become an important candidate material for lead-free energy storage capacitor materials.

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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Patent Type & Authority Patents(China)
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 TECH UNIV
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