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Dielectric ceramic material with giant dielectric constant and low dielectric loss and method for preparing dielectric ceramic material

A technology of giant dielectric constant and ceramic materials, applied in the field of information functional materials, can solve the problems of large dielectric loss and limitation, and achieve the effects of low dielectric loss, suppression of relaxation, excellent temperature and frequency stability

Active Publication Date: 2016-07-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some articles show that when the doping amount of rare earth is about 0.01 to 0.03, the SrTiO can be significantly improved. 3 The dielectric constant of the base ceramic, but the relaxation phenomenon will occur due to the action of defect ions, and the large dielectric loss relaxation peak limits its application in high temperature environments; SrTiO sintered in a protective atmosphere 3 Ceramics often have a large dielectric loss (>0.1) due to the interface polarization of the grain boundary

Method used

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  • Dielectric ceramic material with giant dielectric constant and low dielectric loss and method for preparing dielectric ceramic material
  • Dielectric ceramic material with giant dielectric constant and low dielectric loss and method for preparing dielectric ceramic material
  • Dielectric ceramic material with giant dielectric constant and low dielectric loss and method for preparing dielectric ceramic material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A dielectric ceramic material (Ba 0.2 Sr 0.77 SM 0.02 TiO 3 , label is BSST-28), its preparation method comprises the steps:

[0040] 1) with BaCO 3 , SrCO 3 、Sm 2 o 3 and TiO 2 As raw material, according to Ba 0.2 Sr 0.77 SM 0.02 TiO 3 The stoichiometric ratio of each raw material is selected, a total of 30g, the resulting mixed raw materials are put into a ball mill jar, and zirconium balls and absolute ethanol are used as the medium, and the ball milling rate is 900r / min. After ball milling for 24 hours, put it into a drying oven for drying , the oven temperature is set to 100°C, and the drying time is 24 hours;

[0041] 2) After drying, the mixture obtained was pre-fired at 1150° C. in an air atmosphere for 2 hours, and the pre-fired powder was subjected to secondary ball milling to obtain a pre-fired powder. The secondary ball milling process was consistent with the ball milling process described in step 1);

[0042] 3) Add the calcined powder to a bin...

Embodiment 2

[0048] A dielectric ceramic material (Ba 0.4 Sr 0.57 SM 0.02 TiO 3 , label is BSST-46), its preparation method is roughly the same as Example 1, and the difference is: by Ba 0.4 Sr 0.57 SM 0.02 TiO 3 The stoichiometric ratio of (BSST-46) selects each raw material; the ball milling time is 30 hours, the ball milling speed is 800r / min; the drying oven temperature is set at 100°C, and the drying time is 30 hours; Hours; the second ball milling time is 30h, the ball milling speed is 800r / min; the uniaxial pressure is 10MPa; after repeated vacuuming the pipeline in the sintering furnace for 4 times, the nitrogen gas flow is continued, and the nitrogen flow rate is 100mL / min; the sintering process The temperature system is as follows: first raise the temperature to 1000°C at a heating rate of 6°C / min, then raise the temperature to 1450°C at a heating rate of 3°C / min and keep it for 3 hours, and then cool down to 3°C / min during the sintered ceramic cooling process. After 1000°...

Embodiment 3

[0051] A dielectric ceramic material (Ba 0.1 Sr 0.87 SM 0.02 TiO 3 , label is BSST-19), and its preparation method is roughly the same as Example 1, except that: press Ba 0.1 Sr 0.87 SM 0.02 TiO 3 The stoichiometric ratio of (BSST-19) selects each raw material; the ball milling time is 18 hours, and the ball milling speed is 1000r / min; the pre-burning temperature is 1180°C, and the time is 2.5 hours; the secondary ball milling time is 18h, and the ball milling speed is 1000r / min; In the gas washing process before nitrogen-assisted sintering, the nitrogen gas was continuously pumped and vacuumed 8 times, and nitrogen gas was continuously passed through the entire pipeline at a rate of 50mL / min, and the ceramic green body was sintered in a nitrogen atmosphere; the sintering process The specific temperature system is as follows: first raise the temperature to 1000°C at a heating rate of 8°C / min, then raise the temperature to 1550°C at a heating rate of 5°C / min and keep it f...

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Abstract

The invention discloses a dielectric ceramic material with a giant dielectric constant and low dielectric loss. The dielectric ceramic material is a SrTiO<3>-based ceramic material with giant dielectric performance, a Sr bit of the SrTiO<3>-based ceramic material is jointly substituted by two elements Sm and Ba, a chemical formula of the dielectric ceramic material is Ba<x>Sr<0.97-x>Sm<0.02>TiO<3>, and the x represents a mole fraction of the element Ba, is larger than or equal to 0.1 and is smaller than or equal to 0.4; a fixed mole fraction of the element Sm is 0.02. A method for preparing the dielectric ceramic material includes steps of mixing SrCO<3>, SM<2>O<3>, TiO<2> and BaCO<3> with one another according to a stoichiometric ratio of the chemical formula Ba<x>Sr<0.97-x>Sm<0.02>TiO<3> to obtain mixtures; carrying out ball-milling on the mixtures; drying the mixtures; pre-sintering the mixtures; carrying out secondary ball-milling on the mixtures; granulating the mixtures; molding the mixtures; sintering the mixtures and the like to obtain the dielectric ceramic material. The dielectric ceramic material and the method have the advantages that the dielectric ceramic material is high in dielectric constant (higher than 20000), low in dielectric loss (lower than 0.05) and excellent in temperature and frequency stability; the method is simple and is good in repeatability, high in yield, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of information functional materials, and specifically relates to a dielectric ceramic material with wide temperature and wide frequency stability, a large dielectric constant and low dielectric loss and a preparation method thereof. Background technique [0002] The rapid development of microelectronic information technology puts forward higher requirements for the miniaturization and integration of electronic components. As an important component of electronic components, research on dielectric ceramics has attracted more and more attention. With the development of the information technology field, especially the electronics and microelectronics industry, and the work needs in extreme environments, dielectric materials with good temperature and frequency stability, large dielectric constant, and low dielectric loss have broad application prospects. [0003] In recent years, dielectric materials with giant permittivit...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/622C04B35/64
CPCC04B35/47C04B35/622C04B35/64C04B2235/3215C04B2235/3227C04B2235/96
Inventor 刘韩星李广耀郝华曹明贺陈卓
Owner WUHAN UNIV OF TECH
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