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Doped perovskite barium stannate material and preparation method and application thereof

A technology of barium stannate and perovskite, which is applied in the field of dielectric ceramic materials, can solve the problems that microwave devices cannot be used, and the temperature change of dielectric constant is very large, so as to achieve optimized dielectric properties, high dielectric constant, and simple process Effect

Active Publication Date: 2020-07-14
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the size of the required microwave dielectric ceramic is inversely proportional to the square root of the material's dielectric constant, in order to realize the miniaturization of the device, the dielectric material is required to have a high dielectric constant; many studies have shown that ferroelectric materials, such as BaTiO 3 , to meet the requirements of high dielectric constant, but its dielectric constant varies greatly with temperature and cannot be applied to microwave devices; today, the microwave dielectric ceramics used include tungsten bronze structure BaO-Ln 2 o 3 -TiO 2 (BLT) series, CaTiO 3 Modified series and Ba(Zn 1 / 3 Ta 2 / 3 )O 3 Perovskite series, etc., have a dielectric constant below 100, which is much smaller than the dielectric value of this patent
[0004] "Dielectric relaxation and conduction in the system Ba 1- x La x sn 1-x Cr x o 3 " and "Synthesis, structure and electrical behavior of lanthanum-doped barium stannate" published in the journal "Journal of Physics: Applied Physics" discussed the frequency range of 10Hz ~ 5MHz, Ba 1-x La x sn 1-x Cr x o 3 and Ba 1-x La x SnO 3 Dielectric properties; although the dielectric constant of the two materials can reach 10 3 above, but with strong frequency and temperature dependence

Method used

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  • Doped perovskite barium stannate material and preparation method and application thereof
  • Doped perovskite barium stannate material and preparation method and application thereof
  • Doped perovskite barium stannate material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] The general chemical formula of the doped perovskite barium stannate material in Example 1 is: BaA x B x Sn 1-2x O 3 , Where A=La, B=Nb, x is the atomic ratio, x=0.0005, the preparation process is as follows:

[0041] (1) According to the molar ratio in the general chemical formula, weigh out 19.7340 grams of BaCO 3 ﹑ 15.0559 grams of SnO 2 ﹑0.0082g La 2 O 3 And 0.0066 g Nb 2 O 5 Reactant powder

[0042] (2) Put the above reactant powder in a ball milling tank, use ethanol as a dispersant, and yttrium-stabilized zirconia balls as the ball milling medium, mill for 12 hours, and mix uniformly; after drying, a homogeneous mixture is obtained;

[0043] (3) Place the mixed powder obtained in step (2) in an alumina crucible for calcination. The specific preparation process is as follows: the heating rate is 5°C / min, the temperature range is 1000°C, the holding time is 3 hours, and the atmosphere is Air, after finishing, cool to room temperature naturally;

[0044] (4) After calcinati...

Embodiment 2

[0047] The general chemical formula of the doped perovskite barium stannate material in Example 2 is: BaA x B x Sn 1-2x O 3 , Where A=La, B=Nb, x is the atomic ratio, x=0.001, the preparation process is as follows:

[0048] (1) According to the molar ratio in the general chemical formula, weigh out 19.7340 grams of BaCO 3 ﹑ 15.0409 grams of SnO 2 , 0.0163 g La 2 O 3 And 0.0133 grams of Nb 2 O 5 Reactant powder

[0049] (2) Put the above reactant powder in a ball milling tank, use ethanol as a dispersant, and yttrium-stabilized zirconia balls as the ball milling medium, mill for 12 hours, and mix uniformly; after drying, a homogeneous mixture is obtained;

[0050] (3) Place the mixed powder obtained in step (2) in an alumina crucible for calcination. The specific preparation process is as follows: the heating rate is 5°C / min, the temperature range is 1000°C, the holding time is 3 hours, and the atmosphere is Air, after finishing, cool to room temperature naturally;

[0051] (4) After c...

Embodiment 3

[0054] The general chemical formula of the doped perovskite barium stannate material in Example 3 is: BaA x B x Sn 1-2x O 3 , Where A=La, B=Nb, x is the atomic ratio, x=0.025, the preparation process is as follows:

[0055] (1) According to the molar ratio in the general chemical formula, weigh out 19.7340 grams of BaCO 3 ﹑ 14.3145 grams of SnO 2 ﹑ 0.4073 grams of La 2 O 3 And 0.3323 grams of Nb 2 O 5 Reactant powder

[0056] (2) Put the above reactant powder in a ball milling tank, use ethanol as a dispersant, and yttrium-stabilized zirconia balls as the ball milling medium, mill for 12 hours, and mix uniformly; after drying, a homogeneous mixture is obtained;

[0057] (3) Place the mixed powder obtained in step (2) in an alumina crucible for calcination. The specific preparation process is as follows: the heating rate is 5°C / min, the temperature range is 1000°C, the holding time is 3 hours, and the atmosphere is Air, after finishing, cool to room temperature naturally;

[0058] (4) ...

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Abstract

The invention discloses a doped perovskite barium stannate material, the chemical general formula of the doped perovskite barium stannate material is BaAxBxSn1-2xO3, A is at least one of In, Y, Bi andLa, B is at least one of Nb and Ta, and x is greater than 0 and less than or equal to 0.025. The doped perovskite barium stannate material disclosed by the invention has the properties of high dielectric constant, low loss and good temperature stability, can be used for low-frequency ceramic capacitor dielectrics, and particularly highlights the excellent properties of the doped perovskite bariumstannate material serving as microwave ceramics and the application value of the doped perovskite barium stannate material in the field of microwave communication. The invention also discloses a preparation method of the doped perovskite barium stannate material and application of the doped perovskite barium stannate material in low-frequency ceramic capacitors or microwave communication dielectric ceramics.

Description

Technical field [0001] The invention relates to a dielectric ceramic material, in particular to a doped perovskite barium stannate material and a preparation method and application thereof. Background technique [0002] In the field of microwave (300MHz~300GHz), the rapid development of information technology and wireless communication urgently requires microwave devices with miniaturization, high reliability, good temperature stability, and high quality; as a dielectric material in microwave frequency circuits, microwave dielectric ceramics require At the same time, it has high dielectric constant, low dielectric loss and excellent temperature stability. [0003] Because the size of the microwave dielectric ceramic required is inversely proportional to the square root of the dielectric constant of the material, in order to achieve the miniaturization of the device, the dielectric material is required to have a high dielectric constant; many studies have shown that ferroelectric ma...

Claims

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Application Information

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IPC IPC(8): C04B35/457C04B35/622C04B35/64H01B3/12
CPCC04B35/457C04B35/622C04B35/64H01B3/12C04B2235/3215C04B2235/3409C04B2235/3251C04B2235/3227C04B2235/6562C04B2235/6567C04B2235/6583C04B2235/658C04B2235/662C04B2235/768
Inventor 付振晓刘建梅任海东刘芸特里·詹姆士·弗朗科姆曹秀华沓世我
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG