Giant dielectric constant strontium titanate dielectric ceramic and preparation method thereof

A technology of giant dielectric constant and dielectric ceramics, which is applied in the field of strontium titanate dielectric ceramics and its preparation, can solve the problems of increased dielectric loss and dielectric constant, and achieve improved dielectric properties, increased dielectric constant, high Effect of Insulation Resistivity

Inactive Publication Date: 2021-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current research, it is found that when the dielectric constant of ceramics increases, the dielectric loss will also increase.

Method used

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  • Giant dielectric constant strontium titanate dielectric ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] 1. SrCO 3 、Eu 2 o 3 、TiO 2 Stoichiometric formula Sr 1 -xEu x TiO 3 (x=0.01) batching; put about 15g of powder into the ball mill tank, add 250ml of deionized water and 150g of zirconium balls, and ball mill on a planetary ball mill for 12 hours at a speed of 400 rpm;

[0030] 2. Put the ball-milled powder in an infrared oven, dry it at 80-120°C and pass it through a 40-mesh sieve for 2-3 times;

[0031] 3. Put the dried and sieved powder into a medium-temperature furnace, pre-fire at 1000°C, and keep it warm for 3 hours;

[0032] 4. Put 10g of powder calcined in step 3 into a ball mill tank, add 250ml of deionized water and 150g of zirconium balls, ball mill on a planetary ball mill for 12 hours, then dry, and pass through a 40-mesh sieve for 2 to 3 times;

[0033] 5. Add 7wt% paraffin wax powder to the dried and sieved powder in step 4 as a binder for granulation, pass through an 80-mesh sieve, and then use a powder tablet press to press into a green body with ...

Embodiment 2

[0038] Prepare Sr according to the preparation method of Example 1 1-x Eu x TiO 3 Dielectric ceramics, the only difference is that the sintering atmosphere in step 7 is N 2 with H 2 The flow ratio is 45:5, and the remaining steps are the same as the implementation case 1.

Embodiment 3

[0040] Prepare Sr according to the preparation method of Example 1 1-x Eu x TiO 3 Dielectric ceramics, the only difference is that the sintering temperature in step 7 is 1380°C.

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a giant dielectric constant strontium titanate dielectric ceramic and a preparation method thereof. The chemical formula of the ceramic is Sr1-xEuxTiO3, wherein x is more than or equal to 0.01 and less than or equal to 0.015. The preparation method comprises the following steps: proportioning SrCO3, Eu2O3 and TiO2, mixing, and carrying out ball milling; drying the ball-milled raw materials, sieving, pre-sintering at 1000 DEG C for 3 hours, and mixing and ball-milling the pre-sintered powder; drying and sieving the ball-milled raw materials, adding a binder into the obtained powder, sieving, granulating, pressing into a green body, and discharging glue; and sintering the blank body after complete glue removal at 1400 DEG C in N2 atmosphere, and preserving heat for 6 hours to obtain the final sample. According to the invention, the Sr1-xEuxTiO3 dielectric ceramic is prepared through doping modification by adopting a traditional solid-phase method, the dielectric constant is improved, the lower dielectric loss is kept, and the dielectric property of the ceramic material is further improved, so that the actual application requirements are better met.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a strontium titanate dielectric ceramic and a preparation method thereof. [0002] technical background [0003] With the progress of modern information technology, especially the rapid development of electronics and microelectronics industry, the miniaturization and integration of electronic components have put forward higher and higher requirements. Chipping and miniaturization have become one of the important symbols to measure the development level of electronic components. As an important part of electronic components, dielectric ceramic materials also put forward higher requirements for their dielectric properties. Materials with a giant dielectric constant have received extensive attention. A giant dielectric constant refers to a dielectric whose dielectric constant is higher than or equal to 10 3 order of magnitude. Due to its high dielectric const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622H01G4/12H01G4/30
CPCC04B35/47C04B35/622H01G4/30H01G4/1227C04B2235/3224C04B2235/96
Inventor 李玲霞薛可盈谢嘉玲王梦龙
Owner TIANJIN UNIV
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