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Composite barium strontium titanate ceramics and preparation method thereof

A technology of composite titanium and ceramics, which is applied in the field of ceramic materials, can solve the problems of reduced adjustability of BSTO materials, increased energy consumption of devices, and reduced dielectric constant of materials, etc., and achieves stable and reliable preparation processes, low dielectric loss, and low The effect of dielectric constant

Active Publication Date: 2010-09-29
山东煜辉电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there are still deficiencies in the above material system, that is, while reducing the dielectric constant of the material, the most unique adjustability of BSTO materials is greatly reduced.
In order to achieve a certain degree of adjustability in practical applications of this kind of material, a larger external DC electric field is required, which will inevitably increase the working energy consumption of the device and affect the working efficiency of the device.

Method used

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  • Composite barium strontium titanate ceramics and preparation method thereof
  • Composite barium strontium titanate ceramics and preparation method thereof
  • Composite barium strontium titanate ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment is to prepare 100 g of ceramic materials with an adjustability of 29%.

[0029] In this embodiment, BaCO with a purity of 99.8%, 99.0% and 98.5% respectively 3 , SrCO 3 and TiO 2 Prepared Ba 0.6 Sr 0.4 TiO 3 As the matrix material, ZnO and Al with a purity of 99.0%, 98.0% and 98.0% are added in combination 2 o 3 and MgO, whose composition is Ba 0.6 Sr 0.4 TiO 3 +xZnO+yAl 2 o 3 +10 wt% MgO, where x=0.5 wt%, y=10 wt%.

[0030] The concrete preparation steps of this embodiment are:

[0031] The first step, prepare Ba 0.6 Sr 0.4 TiO 3 Calcined powder; the BaCO 3 , SrCO 3 and TiO 2 Press Ba 0.6 Sr 0.4 TiO 3 Stoichiometric batching, adding 80ml of absolute ethanol medium to the batching, and ball milling for 12h to obtain a slurry; drying the slurry at 100°C for 6h to obtain a powder; pre-calcining the obtained powder at 1050°C for 4h to obtain Ba 0.6 Sr 0.4 TiO 3 Pre-fired powder;

[0032] The second step is to prepare the oxide compo...

Embodiment 2

[0037] In this embodiment, 80 g of ceramic materials with an adjustability of 18% are prepared.

[0038] In this embodiment, BaCO with a purity of 99.0%, 98.0% and 98.0% respectively 3 , SrCO 3 and TiO 2 Prepared Ba 0.6 Sr 0.4 TiO 3 As the matrix material, ZnO and Al with a purity of 98.5%, 99.0% and 99.0% are added in combination 2 o 3 and MgO, whose composition is Ba 0.6 Sr 0.4 TiO 3 +xZnO+yAl 2 o 3 +10 wt% MgO, where x=5 wt%, y=30 wt%.

[0039] The concrete preparation steps of this embodiment are:

[0040] The first step, prepare Ba 0.6 Sr 0.4 TiO 3 Calcined powder; the BaCO 3 , SrCO 3 and TiO 2 Press Ba 0.6 Sr 0.4 TiO 3 Stoichiometric batching, adding 60ml of absolute ethanol medium to the batching, and ball milling for 16h to obtain a slurry; drying the slurry at 80°C for 8h to obtain a powder; pre-calcining the obtained powder at 1100°C for 3h to obtain Ba 0.6 Sr 0.4 TiO 3 Pre-fired powder;

[0041] The second step is to prepare the oxide compos...

Embodiment 3

[0046] In this example, 90 g of ceramic materials with an adjustability of 42% were prepared.

[0047] In this embodiment, BaCO with a purity of 99.5%, 99.0% and 99.0% respectively 3 , SrCO 3 and TiO 2 Prepared Ba 0.6 Sr 0.4 TiO3 As the matrix material, ZnO and Al with a purity of 98.0%, 98.5% and 99.0% are added in combination 2 o 3 and MgO, whose composition is Ba 0.6 Sr 0.4 TiO 3 +xZnO+yAl 2 o 3 +10 wt% MgO, where x=1 wt%, y=25 wt%.

[0048] The concrete preparation steps of this embodiment are:

[0049] The first step, prepare Ba 0.6 Sr 0.4 TiO 3 Calcined powder; the BaCO 3 , SrCO 3 and TiO 2 Press Ba 0.6 Sr 0.4 TiO 3 Stoichiometric batching, adding 70ml of absolute ethanol medium to the batching, and ball milling for 20 hours to obtain a slurry; drying the slurry at 60°C for 10h to obtain a powder; pre-calcining the obtained powder at 1150°C for 3h to obtain Ba 0.6 Sr 0.4 TiO 3 Pre-fired powder;

[0050] The second step is to prepare the oxide comp...

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Abstract

The invention relates to high-tunability composite barium strontium titanate ceramics. Ba0.6Sr0.4TiO3 which is prepared by analytical pure BaCO3, SrCO3 and TiO2 is taken as a matrix material, and analytical pure 0.5-5wt% of ZnO, 10-30wt % of A12O3 and 10wt% of MgO are compositely added to obtain an oxide compositely doped Ba0.6Sr0.4TiO3 powder body by ball milling, drying and presintering; and 5-10wt% of PVA is added to be granulated and formed by pressing, and a ceramic material with 18% to 42% of adjustability is obtained after sintering. The invention has lower dielectric constant and dielectric loss, realizes the substantial adjustability of dielectric constant under low DC field strength, can meet the use requirements of a phase shifter, a dynamic random access memory and other devices for adjustable materials, improves the work efficiency of such devices, and has stable and reliable preparation process.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a composite barium strontium titanate ceramic and a preparation method thereof. Background technique [0002] Barium strontium titanate (Ba 1-x Sr x TiO 3 , referred to as BSTO) is strontium titanate (SrTiO 3 ) solid solution in barium titanate (BaTiO 3 ) form an infinite solid solution. Barium strontium titanate material has very high dielectric tunability, which can adjust the dielectric constant and Curie temperature of the material in a wide range, making it suitable for phased array antennas, ferroelectric memory materials, transmission lines and wireless communications, etc. All of them have great application potential. Since the mid-1990s, the US Armament Research Laboratory has conducted systematic research on barium strontium titanate materials. Subsequently, countries such as the United Kingdom, France, Japan, Sweden and Russia also began to actively en...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 高峰胡国辛曹宵刘亮亮李博许贝
Owner 山东煜辉电子科技有限责任公司
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