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Dielectric adjustable magnesium oxide and barium zirconium titanate composite ceramic

A technology of compounding barium zirconate titanate and magnesium oxide, which is applied in the field of functional ceramics, can solve the problems of large dielectric constant and dielectric loss, large dielectric constant and dielectric loss, and difficulty in meeting the requirements of use, and achieve a reduction in dielectric constant , high tuning rate, low dielectric loss effect

Inactive Publication Date: 2012-02-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the tuning rate of pure barium zirconate titanate is high, the dielectric constant and dielectric loss are large, which is difficult to meet the application requirements
[0003] Literature "X.G.Tang, K.-H.Chew and H.L.W.Chan, Diffuse phase transition and dielectric tunability of Ba(Zr y Ti 1-y )O 3 relaxor ferroelectric ceramics, ACTA MATERIALIA, 52(17), 2004, 5177-5183 "Using traditional ceramic preparation methods, BaZr with different zirconium-titanium ratios was prepared x Ti 1-x o 3 Ceramics, although the tuning rate of ceramics is high (58%), the dielectric constant (~6000) and dielectric loss (0.0043) are both large

Method used

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  • Dielectric adjustable magnesium oxide and barium zirconium titanate composite ceramic
  • Dielectric adjustable magnesium oxide and barium zirconium titanate composite ceramic
  • Dielectric adjustable magnesium oxide and barium zirconium titanate composite ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1, weighing 16.173g BaCO 3 , 4.909g TiO 2 , 8.796g Zr(NO 3 ) 4 ·5H 2 0, put the weighed material into the ball mill tank, press the zirconia ball: material: alcohol is 3: 1: 1 ratio mixing ball mill, the ball milling time is 4 hours; the briquetting after the mixed material is dried, Pre-calcined at 1100°C for 4 hours, took out the calcined material and ground it to obtain 20g of BZT pre-calcined powder, then weighed 9g of BZT powder and 0.9g of MgO, put them into a ball mill jar, ball milled for another 8 hours, and baked After drying, sieve; pre-press the sieved powder into a disc with a diameter of 12 mm and a thickness of 1 mm, and then finally shape it under an isostatic pressure of 200 MPa; keep the formed disc at 1250 ° C for 6 hours; after sintering into porcelain, it is ground and polished, then coated with silver paste, and kept at 550°C for 30 minutes to burn the silver electrodes. The ceramic structure was tested with a fully automatic X-ray ...

Embodiment 2

[0020] Embodiment 2, weighing 16.173g BaCO 3 , 4.909g TiO 2 , 8.796g Zr(NO 3 ) 4 ·5H 2 0, put the weighed material into the ball mill tank, press the zirconia ball: material: alcohol is 3: 1: 1 ratio mixing ball mill, the ball milling time is 5 hours; the briquetting after the mixed material is dried, Pre-calcined at 1150°C for 3 hours, took out the calcined material and ground it to obtain 20g of BZT pre-calcined powder, then weighed 8g of BZT powder and 1.6g of MgO, put them into a ball mill jar, ball milled for another 10 hours, and baked After drying, sieve; pre-press the sieved powder into a disc with a diameter of 12 mm and a thickness of 1 mm, and then finally shape it under an isostatic pressure of 200 MPa; keep the formed disc at 1300 ° C for 4 hours; after sintering into porcelain, it is ground and polished, then coated with silver paste, and kept at 550°C for 30 minutes to burn the silver electrode. The ceramic structure was tested with a fully automatic X-ray ...

Embodiment 3

[0021] Embodiment 3, weighing 16.173g BaCO 3 , 4.909g TiO 2 , 8.796g Zr(NO 3 ) 4 ·5H 2 0, put the weighed material into the ball mill tank, press the zirconia ball: material: alcohol is 3: 1: 1 ratio mixing ball mill, the ball milling time is 6 hours; the briquetting after the mixed material is dried, Pre-calcin at 1200°C for 2 hours, take out the calcined material and grind to obtain 20g of BZT pre-calcined powder, then weigh 7g of BZT powder and 2.1g of MgO, put them into a ball mill jar, ball mill for another 11 hours, bake After drying, sieve; pre-press the sieved powder into a disc with a diameter of 12 mm and a thickness of 1 mm, and then finally shape it under an isostatic pressure of 200 MPa; keep the formed disc at 1350 ° C for 2 hours; after sintering into porcelain, it is ground and polished, then coated with silver paste, and kept at 550°C for 30 minutes to burn the silver electrode. The ceramic structure was tested with a fully automatic X-ray diffractometer ...

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Abstract

The invention relates to a dielectric adjustable magnesium oxide and barium zirconium titanate composite ceramic, which is technically characterized in that: the chemical general formula of the magnesium oxide and barium zirconium titanate composite ceramic is BaZr0.25Ti0.75O3; the magnesium oxide and barium zirconium titanate composite ceramic is prepared by a ceramic preparation process; and at the room temperature and the frequency of 10kHz, the dielectric constant (672) of the ceramic is proper by component optimization, and low dielectric loss (0.0016) and high tuning rate (30 percent) are kept, so the magnesium oxide and barium zirconium titanate composite ceramic can meet the using requirement of a ferroelectric phase shifter, and the formula and the preparation method of the ceramic are suitable for industrialized popularization and large-batch production.

Description

technical field [0001] The invention relates to a dielectrically adjustable magnesium oxide composite barium zirconate titanate ceramic, which belongs to the field of functional ceramics. The MgO composite barium zirconate titanate ceramic prepared by this formula and process has moderate dielectric constant, low dielectric loss and high tuning rate, which can meet the requirements of ferroelectric phase shifter. Background technique [0002] The development of ferroelectric phase shifters urgently needs a tuning material with moderate dielectric constant near room temperature, low dielectric loss, and high tuning rate. Barium zirconate titanate series solid solution is considered to be a suitable candidate. Although the tuning rate of pure barium zirconate titanate is high, its dielectric constant and dielectric loss are relatively large, which is difficult to meet the application requirements. [0003] Literature "X.G.Tang, K.-H.Chew and H.L.W.Chan, Diffuse phase transiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622
Inventor 任鹏荣樊慧庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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