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Low-loss, high-temperature and lead-free capacitor material and preparation method thereof

A technology of capacitors and capacitor ceramics, applied in the field of dielectrics, can solve problems such as insufficient environmental protection and large lead pollution, and achieve lower dielectric loss, high dielectric constant, and improved interface carrier transport and dipole polarization state. Effect

Active Publication Date: 2016-02-03
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] such as Pb(ZrTi)O 3 Such Pb-based perovskites have the characteristics of high dielectric constant, but the lead added in the raw materials has great pollution to the operator and the environment, and is not environmentally friendly.

Method used

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  • Low-loss, high-temperature and lead-free capacitor material and preparation method thereof
  • Low-loss, high-temperature and lead-free capacitor material and preparation method thereof
  • Low-loss, high-temperature and lead-free capacitor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Using analytically pure cerium oxide, barium carbonate, strontium carbonate, titanium dioxide, bismuth nitrate, tetrabutyl titanate and magnesium nitrate as raw materials, the compound (Ba 0.8 Sr 0.2 ) 0.85 Ce 0.1 TiO 3 Powder;

[0024] (2) Analytical pure magnesium nitrate and bismuth nitrate are weighed and prepared in a molar ratio of 1:2, dissolved in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 5 times that of magnesium nitrate and bismuth nitrate. Obtain a homogeneous solution;

[0025] (3) Based on the magnesium nitrate in step (2), measure the corresponding amount of tetrabutyl titanate with a graduated cylinder according to the Mg:Ti molar ratio of 1:1 and dissolve it in methanol. The volume of methanol is the volume of tetrabutyl titanate 10 times of that, fully stirred, so that tetrabutyl titanate was evenly dissolved in methanol to obtain a homogeneous solution;

[0026] (4) Drop the solution obtained in ste...

Embodiment 2

[0033] (1) Using analytically pure cerium oxide, barium carbonate, strontium carbonate, titanium dioxide, bismuth nitrate, tetrabutyl titanate and magnesium nitrate as raw materials, the compound (Ba 0.8 Sr 0.2 ) 0.85 Ce 0.1 TiO 3 ;

[0034] (2) Analytical pure magnesium nitrate and bismuth nitrate are weighed and prepared according to a molar ratio of 1:2, dissolved in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 7 times that of the raw material to obtain a homogeneous solution ;

[0035] (3) Based on the magnesium nitrate in step (2), measure the corresponding amount of tetrabutyl titanate with a graduated cylinder according to the Mg:Ti molar ratio of 1:1 and dissolve it in methanol. The volume of methanol is the volume of tetrabutyl titanate 8 times of that, fully stirred, so that tetrabutyl titanate was evenly dissolved in methanol to obtain a homogeneous solution;

[0036] (4) Drop the solution obtained in step (3) into the ...

Embodiment 3

[0043] (1) Using analytically pure cerium oxide, barium carbonate, strontium carbonate, titanium dioxide, bismuth nitrate, tetrabutyl titanate and magnesium nitrate as raw materials, the compound (Ba 0.8 Sr 0.2 ) 0.7 Ce 0.2 TiO 3 ;

[0044] (2) Use analytical grade magnesium nitrate and bismuth nitrate to weigh the ingredients in a molar ratio of 1:2, dissolve them in ethylene glycol monomethyl ether, and the quality of ethylene glycol monomethyl ether is 8 times that of the raw material. to obtain a homogeneous solution;

[0045] (3) Based on the magnesium nitrate in step (2), measure the corresponding amount of tetrabutyl titanate with a graduated cylinder according to the Mg:Ti molar ratio of 1:1 and dissolve it in methanol. The volume of methanol is the volume of tetrabutyl titanate 7 times of that, fully stirred, so that tetrabutyl titanate was evenly dissolved in methanol to obtain a homogeneous solution;

[0046] (4) Drop the solution obtained in step (2) into the...

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Abstract

The invention discloses a low-loss, high-temperature and lead-free capacitor material and a preparation method thereof. The material is a two-phase complex formed by Bi(Mg<0.5> Ti<0.5>) O<3> and (Ba<0.8> Sr<0.2>)<(1-x)>Ce<2x / 3>TiO<3>, 0<x<0.4, and x is a mole fraction. (Ba<0.8> Sr<0.2>)<(1-x)>Ce<2x / 3>TiO<3> particles are coated with Bi(Mg<0.5> Ti<0.5>) O<3> powder through the gel process, and the molar ratio of Bi(Mg<0.5> Ti<0.5>) O<3> to (Ba<0.8> Sr<0.2>)<(1-x)>Ce<2x / 3>TiO<3> is 0.5 to 1.5. The low-loss, high-temperature and lead-free capacitor material is good in temperature stability, and has low losses of a wide temperature area and a high dielectric constant.

Description

technical field [0001] The invention relates to a low-loss high-temperature barium titanate-based lead-free capacitor material and a preparation method thereof, belonging to the technical field of dielectrics. Background technique [0002] The operating temperature upper limit of commercial X7R, X8R and X9R capacitors is 125°C, 150°C and 175°C respectively, and these types of capacitors can be widely used in different occasions. However, with the development of technology, higher requirements are placed on the operating temperature of capacitors. For example, ceramic capacitors used in hybrid or electric drive devices need to use a temperature limit above 200°C and have good dielectric properties. [0003] such as Pb(ZrTi)O 3 Pb-based perovskites such as Pb-based perovskites have the characteristics of high dielectric constant, but the lead added in the raw materials pollutes the operator and the environment very much, and is not environmentally friendly. Lead-free cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/628
Inventor 刘芳华刘来君张礼华
Owner HUAWEI TEHCHNOLOGIES CO LTD
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