A kind of x8r type fine-grained ceramic capacitor dielectric material and preparation method thereof

A technology of ceramic capacitors and capacitor dielectrics, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the unfavorable development of MLCC ultra-thin layers, large powder particles and ceramic grains, Long preparation process route and other problems, to achieve the effect of small temperature change rate, small dielectric loss and good dispersion

Inactive Publication Date: 2017-03-08
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the long preparation process of the solid-state method, and the prepared powder particles and ceramic grains are large, it is not conducive to the development of ultra-thin layer of MLCC

Method used

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  • A kind of x8r type fine-grained ceramic capacitor dielectric material and preparation method thereof
  • A kind of x8r type fine-grained ceramic capacitor dielectric material and preparation method thereof
  • A kind of x8r type fine-grained ceramic capacitor dielectric material and preparation method thereof

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Experimental program
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preparation example Construction

[0028] Its preparation method comprises the following steps:

[0029] (1) At a water bath temperature of 30-50 °C, a certain amount of TiCl 4 Slowly add the solution dropwise into 6~10 mol / L NaOH solution, and stir thoroughly for 0.5~1 h;

[0030] (2) Slowly add the prepared aqueous solution of bismuth and barium ions according to the stoichiometric ratio, and keep stirring. The reaction temperature is 30~50 ℃, and the reaction time is 0.5~1 h;

[0031] (3) Continue stirring the above solution for 2-6 h at a water bath temperature of 75-95 °C, wash and dry to obtain Ba 1- x Bi x TiO 3 Powder;

[0032] (4) The Ba of step (3) 1-x Bi x TiO 3 The powder is ultrasonically dispersed in deionized water to obtain Ba with good dispersibility 1- x Bi x TiO 3 suspension;

[0033] (5) mixing the niobium oxalate solution and the cobalt nitrate solution according to the ratio of substances to obtain a clear mixed solution of inorganic salts;

[0034] (6) Slowly add the mixed so...

Embodiment 1

[0039] Preparation of Ba 1-x Bi x TiO 3 @(Nb 2 o 5 -Co 3 o 4 ) powder and its ceramic materials, wherein, Ba 1-x Bi x TiO 3 + n(aNb 2 o 5 + bCo 3 o 4 ) in x=0.010, a:b=3:1; n are 0.004, 0.008, 0.012 and 0.016 respectively (the serial numbers of corresponding samples are recorded as #1-1, #1-2, #1-3 and #1- 4). Promptly adopt the liquid phase coating method of the present invention to prepare Ba 0.99 Bi 0.01 TiO 3 + n(3 mol% Nb 2 o 5 + 1 mol% Co 3 o 4 ) The specific steps of the powder and its ceramic dielectric material are as follows:

[0040] (1) At a water bath temperature of 30 °C, 50.00 mL of 0.2014 g / mL TiCl 4 The solution was slowly added dropwise into 100.00 mL of 10.0 mol / L NaOH solution, and fully stirred for 0.5 h, then slowly added bismuth and barium aqueous solutions to the above solution according to the stoichiometric ratio, and kept stirring for 0.5 h, and then the above The solution was stirred for 4 h in a water bath at a temperature o...

Embodiment 2

[0049] Adopt the liquid phase coating method technique of the present invention to prepare Ba 1-x Bi x TiO 3 @(Nb 2 o 5 -Co 3 o 4 ) powder and its ceramic materials, wherein, Ba 1-x Bi x TiO 3 + n(aNb 2 o 5 + bCo 3 o 4 ) where x=0.010 and n=0.012; a:b are 6:1, 4.5:1, 3:1 and 1.5:1 respectively (the serial numbers of corresponding samples are recorded as #2-1, #2-2, #2 in turn -3 and #2-4). i.e. prepared Ba 0.99 Bi 0.01 TiO 3 + 0.012×(aNb 2 o 5 + bCo 3 o 4 ) The specific steps of the powder and its ceramic dielectric material are as follows:

[0050] (1) At a water bath temperature of 30 °C, 50.00 mL of 0.2014 g / mL TiCl 4 The solution was slowly added dropwise into 100.00 mL of 10.0 mol / L NaOH solution, and fully stirred for 0.5 h, then slowly added bismuth and barium aqueous solutions to the above solution according to the stoichiometric ratio, and kept stirring for 0.5 h, and then the above The solution was stirred for 4 h in a water bath at a tempera...

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Abstract

The invention discloses an X8R type Ba1‑xBixTiO3@(Nb2O5‑Co3O4) fine-grained ceramic capacitor dielectric material and a preparation method thereof. Its chemical composition general formula satisfies: Ba1‑xBixTiO3 + n(aNb2O5 + bCo3O4), wherein, 0.002< x≤0.015, n=0.004~0.016, a=0.15~0.60 mol%, b=0.03~0.14 mol%. The powder material produced by the present invention using the precipitation method and the liquid phase coating method reaches the following indicators: the Ba1-xBixTiO3 powder has good dispersion, the particle size of the particles is controlled at 50~500 nm, and the thickness of the composite oxide coating layer is controlled at 5~30 nm; the performance of the prepared ceramic dielectric material reaches the following indicators: the ceramic discs are sintered in the temperature range of 1100~1300 ℃, the ceramic grains are controlled at 100~550 nm, the room temperature dielectric constant is < 2600, and the room temperature dielectric constant Electrical loss < 2.5%, ∆C / C25°C < ±15% in the temperature range of -55 ℃ ~ 150 ℃.

Description

technical field [0001] The invention relates to an X8R type fine-grained ceramic capacitor dielectric material and a preparation method thereof, belonging to the technical field of electronic ceramic capacitor materials. Background technique [0002] With the rapid development of multilayer ceramic capacitors (MLCC), in order to meet the requirements of miniaturization, large capacity, and application in high temperature environments, ceramic dielectric materials must not only have high dielectric constants, but also require their capacity temperature change rate to be within It exhibits smooth changing characteristics in a wide temperature range. At present, X8R ceramic dielectric materials are widely used in petroleum exploration, automobile engines, shock resistance systems and other fields because of their good temperature stability in a wide temperature range. The EIA (Electronic International Association) standard of X8R is as follows: 8 and X represent the upper and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/468C04B35/622
Inventor 崔斌刘宇王艳上官梦倩赵小彤王尧宇李承朔
Owner NORTHWEST UNIV
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