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Transition element doped barium-strontium titanate based composite ceramic and preparation method thereof

A technology of element doping and barium strontium titanate, which is applied in the field of strontium barium titanate-based composite ceramics and its preparation, can solve the problems of high microwave dielectric loss and reduced voltage control adjustability, so as to improve sintering performance and reduce Effect of Dielectric Loss

Active Publication Date: 2010-06-16
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microwave dielectric loss of barium strontium titanate is too high and needs further optimization
Judging from the literature that has been published so far, most of the methods that can reduce the dielectric loss of barium strontium titanate often reduce the voltage control adjustability at the same time.

Method used

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  • Transition element doped barium-strontium titanate based composite ceramic and preparation method thereof
  • Transition element doped barium-strontium titanate based composite ceramic and preparation method thereof
  • Transition element doped barium-strontium titanate based composite ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Press Ba 0.6 Sr 0.4 TiO 3 (BST) stoichiometric dose ratio Weigh an appropriate amount of BaCO 3 , SrCO 3 and TiO 2 Put the powder (purity ≥ 99.5%) into the agate mixing tank, add agate balls and alcohol, and mix on a three-roll mixer for 24 hours. The volume ratio of the agate balls, alcohol and powder is 6:2:1. The above mixed slurry was dried in an oven at 100°C, and then pre-fired in air at 1100°C×4h at normal pressure to obtain Ba 0.6 Sr 0.4 TiO 3 Powder.

[0046] According to the above mixing process, the MnO 2 Powder (particle size 0.3~0.5μm, purity ≥99%) and Ba 0.6 Sr 0.4 TiO 3 Powder mixed evenly, MnO 2 with Ba 0.6 Sr 0.4 TiO 3 The molar ratio of the powder is 0.0%, 0.25%, 0.50%, 0.75%, 1.00% and 1.25%, respectively. The mixed powder was dried, and then pre-fired in air at 1100°C×4h to prepare Mn-doped Ba 0.6 Sr 0.4 TiO 3 Powder (Mn-Ba 0.6 Sr 0.4 TiO 3 ), the XRD analysis results of the powder are as follows figure 2 shown. It can be see...

Embodiment 2

[0051] Press Ba 0.6 Sr 0.4 TiO 3 Stoichiometric Dose Ratio Weigh an appropriate amount of BaCO 3 , SrCO 3 and TiO 2 (Purity≥99.5%) into the agate mixing tank, add agate balls and alcohol, mix on a three-roll mixer for 24h, the volume ratio of agate balls, alcohol and powder is 6:2:l. The above mixed slurry was dried in an oven at 100°C, and then pre-fired in air at 1100°C×4h at normal pressure to obtain Ba 0.6 Sr 0.4 TiO 3 Powder. According to the above mixing process, Fe 2 o 3 Powder (particle size 0.3~0.5μm, purity ≥99%) and Ba 0.6 Sr 0.4 TiO 3 Powder mixed evenly, Fe 2 o 3 Middle Fe and Ba 0.6 Sr 0.4 TiO 3 The molar ratio of the powder is 0.0%, 0.25%, 0.50%, 0.75%, 1.00% and 1.25%, respectively. The mixed powder was dried, and then pre-fired in air at 1100°C×4h to obtain Fe-doped Ba 0.6 Sr 0.4 TiO 3 Powder (Fe-Ba 0.6 Sr 0.4 TiO 3 ), the XRD analysis results of the powder are as follows Figure 4 shown. It can be seen that all Fe-BST powders form a ...

Embodiment 3

[0055] Press Ba 0.6 Sr 0.4 TiO 3 Stoichiometric Dose Ratio Weigh an appropriate amount of BaCO 3 , SrCO 3 and TiO 2 (purity ≥ 99.5%) into the agate mixing tank, add agate balls and alcohol, and mix on a three-roll mixer for 24 hours, the volume ratio of agate balls, alcohol and powder is 6:2:1. The above mixed slurry was dried in an oven at 100°C, and then pre-fired in air at 1100°C×4h at normal pressure to obtain Ba 0.6 Sr 0.4 TiO 3 Powder. According to the above mixing process, Co 2 o 3 Powder (particle size 0.3~0.5μm, purity ≥99%) and Ba 0.6 Sr 0.4 TiO 3 The powder is mixed evenly, Co 2 o 3 In Co and Ba 0.6 Sr 0.4 TiO 3 The molar ratio of the powder is 0.0%, 0.25%, 0.50%, 0.75%, 1.00% and 1.25%, respectively. The mixed powder was dried, and then pre-fired in air at 1100°C×4h to prepare Co-doped Ba 0.6 Sr 0.4 TiO 3 Powder (Co-Ba 0.6 Sr 0.4 TiO 3 ), the XRD analysis results of the powder are as follows Image 6 shown. It can be seen that all Co-BST p...

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Abstract

The invention relates to a transition element doped barium-strontium titanate based composite ceramic, which comprises 40 weight percent of xM-Ba0.6Sr0.4TiO3 and 60 weight percent of MgO, wherein M is a transition metal, and x is the molar ratio of the transition metal M to Ba0.6Sr0.4TiO3 and ranges from 0.25 to 1.25 percent. Because of the doping of the transition element, the pressure control adjustable rate of the M-Ba0.6Sr0.4TiO3 / MgO composite ceramic is improved, the microwave dielectric loss is greatly reduced, and meanwhile the breakdown field strengths of ceramic blocks are more than 28 kV / mm and can meet the using requirements of microwave dielectric materials.

Description

technical field [0001] The invention relates to a transition group element-doped strontium barium titanate-based composite ceramic and a preparation method thereof, in particular to a transition group element-doped strontium barium titanate-based composite ceramic with low loss and high microwave voltage control adjustability A ceramic and a preparation method thereof, the material is especially suitable for microwave devices such as a phased array phase shifter, an adjustable filter, a delay line, an oscillator, and a resonator. Background technique [0002] Phased array radar is a new type of active electronically scanned array multifunctional radar. It not only has the function of traditional radar, but also has other radio frequency functions. The most important feature of the active electronically scanned array is that it can radiate and receive radio frequency energy directly into the air. Compared with the mechanical scanning antenna system, it has many significant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/622
Inventor 董桂霞崔建东杨志民宋占永
Owner GRIMAT ENG INST CO LTD
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