Unlock instant, AI-driven research and patent intelligence for your innovation.

Bismuth zinc niobate / barium strontium titanate composite dielectric adjustable thick film preparation method

A technology of strontium barium titanate and bismuth zinc niobium, applied in the field of dielectric thick film preparation, can solve the problems of adjustable characteristics and quality factor reduction, low electrical quality factor, high dielectric loss, etc.

Inactive Publication Date: 2007-10-31
XI AN JIAOTONG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Barium strontium titanate thin film material has high dielectric constant and large dielectric tunable characteristics, but its dielectric loss (tanδ) is high, resulting in low electrical quality factor Q (=1 / tanδ), which is more commonly used The method is still to use strontium barium titanate thick film doped with magnesium oxide (MgO), which can reduce the dielectric loss of strontium barium titanate very well, but the adjustable characteristics and quality factors of the material are correspondingly reduced, and the heat treatment temperature rises. High, and its high-frequency temperature stability is still a key issue to be solved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. First, according to the chemical composition, it is Ba 0.5 Sr 0.5 TiO 3 Dissolve barium acetate and strontium acetate satisfying the stoichiometric ratio in glacial acetic acid, stir thoroughly at 80°C for 30 minutes, mix tetrabutyl titanate and acetylacetone at a molar ratio of 2:1, and then add them to barium acetate In the mixed solution, and stirred at room temperature for 30 minutes, the clear precursor of barium strontium titanate sol was finally obtained;

[0026] 2. Then according to the traditional ceramic process at 850 ° C for 3 hours to obtain the chemical composition as Bi 1.5 ZnNb 1.5 o 7 Bismuth-zinc-niobium powder with a cubic pyrochlore structure without the appearance of a second phase, and then crushed by ordinary ball milling and high-energy ball milling to obtain bismuth-zinc-niobium nanopowders with a particle size of less than 1 micron;

[0027] 3. Select bismuth zinc niobium nanopowder and mix it with strontium barium titanate precursor s...

Embodiment 2

[0032] 1. First, according to the chemical composition, it is Ba 0.5 Sr 0.5 TiO 3 Dissolve barium acetate and strontium acetate satisfying the stoichiometric ratio in glacial acetic acid, stir thoroughly at 80°C for 30 minutes, mix tetrabutyl titanate and acetylacetone at a molar ratio of 2:1, and then add them to barium acetate In the mixed solution, and stirred at room temperature for 30 minutes, the clear precursor of barium strontium titanate sol was finally obtained;

[0033] 2. Then according to the traditional ceramic process at 950 ° C for 3 hours to obtain the chemical composition as Bi 1.5 ZnNb 1.5 o 7 Bismuth-zinc-niobium powder with a cubic pyrochlore structure without the appearance of a second phase, and then crushed by ordinary ball milling and high-energy ball milling to obtain bismuth-zinc-niobium nanopowders with a particle size of less than 1 micron;

[0034] 3. Select bismuth zinc niobium nanopowder and mix it with strontium barium titanate precursor s...

Embodiment 3

[0039] 1. First, according to the chemical composition, it is Ba 0.5 Sr 0.5 TiO 3 Dissolve barium acetate and strontium acetate satisfying the stoichiometric ratio in glacial acetic acid, stir thoroughly at 80°C for 30 minutes, mix tetrabutyl titanate and acetylacetone at a molar ratio of 2:1, and then add them to barium acetate In the mixed solution, and stirred at room temperature for 30 minutes, the clear precursor of barium strontium titanate sol was finally obtained;

[0040] 2. Then according to the traditional ceramic process at 900 ° C for 3 hours to obtain the chemical composition as Bi 1.5 ZnNb 1.5 o 7 Bismuth-zinc-niobium powder with a cubic pyrochlore structure without the appearance of a second phase, and then crushed by ordinary ball milling and high-energy ball milling to obtain bismuth-zinc-niobium nanopowders with a particle size of less than 1 micron;

[0041] 3. Select bismuth zinc niobium nanopowder and mix it with strontium barium titanate precursor s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates the preparing method of bismuth zinc niobium- barium strontium titanate, comprising the following steps: adding bismuth zinc niobium nanometer powder into barium strontium titanate solation, then adopting rotary coating technology to deposit on the base material, and making the bismuth zinc niobium nanometer powder disperse in the barium strontium titanate film dielectric. The invention chooses two kinds of microwave adjustable dielectric film which have different structures and action mechanisms to make film material possessing compound structures, the invention uses the good temperature stability, dielectric constant and low deterioration of bismuth zinc niobium film to compensate for high dielectric constant and dielectric loss of barium strontium titanate, and uses dielectric adjustable property of barium strontium titanate at low field density to compensate for the shortage of high-field intensity of bismuth zinc niobium material, improving character factor of material, reducing electric field intensity and getting new pattern practical coextruded film material.

Description

technical field [0001] The invention relates to a preparation method of a dielectric thick film in an inorganic material, in particular to a preparation method of a bismuth zinc niobium-strontium barium titanate composite dielectric adjustable thickness film. Background technique [0002] With the development of modern communication technology, especially mobile communication technology, the miniaturization of microwave devices and systems is increasingly urgent. Dielectric materials with tunable properties can be used to prepare phase shifters, coplanar waveguides and tunable filters. tunable microwave devices. [0003] Due to surface power components and performance requirements, the demand for dielectric thick film materials with tunable microwave characteristics is gradually increasing. At present, most research work on tunable dielectric materials is concentrated on strontium barium titanate (Ba 0.5 Sr 0.5 TiO 3 ) and bismuth-zinc-niobium (Bi 1.5 ZnNb 1.5 o 7 ) on...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/465C04B35/495C04B35/622
Inventor 史鹏任巍吴小清张镭黄瑞峰姚熹
Owner XI AN JIAOTONG UNIV