High-energy-density strontium bismuth titanate based composite ceramic and preparation method thereof
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A high energy storage density, strontium bismuth titanate technology, applied in the field of dielectric energy storage ceramic materials, can solve the problems of low breakdown strength and achieve the effects of high density, fine and uniform grains, and low sintering temperature
Inactive Publication Date: 2015-06-17
GUILIN UNIV OF ELECTRONIC TECH
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Generally, ferroelectric ceramic dielectric materials have high dielectric constant but low breakdown strength. Therefore, finding a high energy storage density dielectric material with high dielectric constant while maintaining high breakdown strength is a current challenge.
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Embodiment 1
[0022] The preparation ingredients are: (1- x - y )Sr 1-1.5z( Bi 0.8 La 0.2 ) z TiO 3 - x (Bi 0.5 Na 0.5 ) 1-m Mg m TiO 3 - y Bi 0.5 Li 0.5 (Ti 0.92 mn 0.08 )
[0023] o 3 ,in x =0.7, y =0.1, z =0.1, m =0.05 high energy storage density strontium bismuth titanate based composite ceramic dielectric material,
[0024] The preparation method comprises the following steps:
[0025] (1) To analyze pure Bi 2 o 3 、Na 2 CO 3 , SrCO 3 , MgO, TiO 2 , Li 2 CO 3 , MnO 2 and La 2 o 3 As a raw material, according to the chemical formula (1- x - y )Sr 1-1.5z (Bi 0.8 La 0.2 ) z TiO 3 - x (Bi 0.5 Na 0.5 ) 1-m Mg m TiO 3 - y Bi 0.5 Li 0.5 (Ti 0.92 mn 0.08 )O 3 ( x =0.7, y =0.1, z =0.1, m =0.05), carry out batching, take dehydrated alcohol as the medium vibrating ball mill 24 hours, after drying in the crucible with 850 ℃ of pre-burning insulation 4 hours synthetic powder;
[0026] (2) After the powder is dried, add a 2% (weight percentage...
Embodiment 2
[0031] Composition expression is the same as embodiment 1:
[0032] The preparation ingredients are: (1- x - y )Sr 1-1.5z( Bi 0.8 La 0.2 ) z TiO 3 - x (Bi 0.5 Na 0.5 ) 1-m Mg m TiO 3 - y Bi 0.5 Li 0.5 (Ti 0.92 mn 0.08 )
[0033] o 3 ,in x =0.6, y =0.2, z =0.2, m =0.1 high energy storage density strontium bismuth titanate based composite ceramic dielectric material
[0034] The preparation method is the same as in Example 1, except that the pre-burning insulation is 900°C, and the performance is as shown in table 1
Embodiment 3
[0036] Composition expression is the same as embodiment 1:
[0037] The preparation ingredients are: (1- x - y )Sr 1-1.5z( Bi 0.8 La 0.2 ) z TiO 3 - x (Bi 0.5 Na 0.5 ) 1-m Mg m TiO 3 - y Bi 0.5 Li 0.5 (Ti 0.92 mn 0.08 )
[0038] o 3 ,in x =0.4, y =0.15, z =0.08, m =0.12 high energy storage density strontium bismuth titanate based composite ceramic dielectric material
[0039] The preparation method is the same as in Example 1, except that the pre-burning insulation is 800°C, and the performance is as shown in table 1
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Abstract
The invention discloses a high-energy-density strontium bismuth titanate based composite ceramic and a preparation method thereof. Constituents of the high-energy-density strontium bismuth titanate based composite ceramic are expressed by a general formula (1-x-y)Sr(1-1.5)z(Bi0.8La0.2)zTiO(3-x)(Bi0.5Na0.5)(1-m)MgmTiO(3-y)Bi0.5Li0.5(Ti0.92Mn0.08)O3, wherein x, y, z and m represent molar fractions; x is greater than or equal to 0.2 and less than or equal to 0.7; y is greater than or equal to 0.01 and less than or equal to 0.2; z is greater than or equal to 0.05 and less than or equal to 0.3; m is greater than or equal to 0.02 and less than or equal to 0.2. The high-energy-density strontium bismuth titanate based composite ceramic is prepared by adjusting the constituents to form a composite composition, and adopting microwave sintering to form a dense structure with uniform and small crystal grains, so as to keep a high dielectric constant and obtain a high withstand voltage. The preparation method disclosed by the invention is simple and stable in preparation process and suitable for industrial popularization and application. The high-energy-density composite ceramic dielectric material is excellent in energy storage characteristic and energy storage efficiency; the stored energy density can be up to 1.9 J / cm<3>; the energy storage efficiency can be up to 65%; the high-energy-density composite ceramic dielectric material is environment-friendly, low in loss and good in practicability.
Description
technical field [0001] The invention relates to a dielectric energy storage ceramic material, in particular to a strontium bismuth titanate-based composite ceramic with high energy storage density and a preparation method thereof. Background technique [0002] With the acceleration of economic growth in developing countries and the growing demand for energy, the problems of improving the efficiency of traditional energy utilization and expanding the practical scope of new energy have become increasingly prominent. Energy storage capacitors have the advantages of large discharge power, high utilization efficiency, large space for energy storage density increase, fast charge and discharge speed, anti-cycle aging, suitable for extreme environments such as high temperature and high pressure, and stable performance. They are gradually becoming the storage capacitors in pulse power equipment. Energy components are widely used in national defense and modern industrial fields such a...
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