Low-electric-field high-dielectric adjustable zirconium-doped barium ferrite and preparation method thereof

A technology of barium ferrite and high dielectric, which is applied in the field of zirconium-doped barium ferrite ceramic materials and its preparation, can solve the problem of high modulation electric field, achieve high dielectric adjustability, simple process, high dielectric The effect of electrical characteristics

Active Publication Date: 2019-04-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a zirconium-doped barium ferrite ceramic material with ultra-low modulation voltage and high dielectric tuning rate and its preparation method in view of the shortcomings of the existing dielectric tunable materials with high modulation electric field

Method used

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  • Low-electric-field high-dielectric adjustable zirconium-doped barium ferrite and preparation method thereof
  • Low-electric-field high-dielectric adjustable zirconium-doped barium ferrite and preparation method thereof
  • Low-electric-field high-dielectric adjustable zirconium-doped barium ferrite and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0033] (1) Mix barium nitrate, ferric nitrate, zirconium nitrate and citric acid in a molar ratio of 1:11.9:0.1:19.05, add deionized water and stir until the solute is completely dissolved to obtain solution A.

[0034] (2) Adjust the pH of solution A to 7 to obtain solution B. Then, the solution B was heated and stirred in a water bath at 90° C. for 4 h to evaporate the solvent to obtain a sol precursor. The resulting sol precursor was dried at 120 °C for 4 days to obtain a fluffy black gel.

[0035] (3) Grinding the obtained xerogel in a mortar, and then putting it into a muffle furnace for pre-calcination. The pre-burning is specifically: raising the temperature to 210°C at a heating rate of 8°C / min, and keeping it at this temperature for 2h, then raising the temperature to 450°C at a heating rate of 6°C / min, and keeping it at this temperature for 2.5h, so that The dry gel is completely burned and decomposed, and finally the temperature is raised to 800°C at a heating rat...

example 2

[0042] (1) Mix barium nitrate, ferric nitrate, zirconium nitrate and citric acid in a molar ratio of 1:11.8:0.2:19.1, add deionized water and stir until the solute is completely dissolved to obtain solution A.

[0043] (2) Adjust the pH of solution A to 6 to obtain solution B. Then, the solution B was heated and stirred in a water bath at 80° C. for 3.5 h to evaporate the solvent to obtain a sol precursor. The resulting sol precursor was dried at 118 °C for 5 days to obtain a fluffy black gel.

[0044] (3) Grinding the obtained black gel in a mortar, and then putting it into a muffle furnace for pre-calcination. The pre-burning is specifically: raising the temperature to 210°C at a heating rate of 6°C / min, and keeping it at this temperature for 2.5h, then raising the temperature to 450°C at a heating rate of 8°C / min, and keeping it at this temperature for 2h, so that The black gel was completely burned and decomposed, and finally the temperature was raised to 800°C at a heat...

example 3

[0050] (1) Mix barium nitrate, ferric nitrate, zirconium nitrate and citric acid in a molar ratio of 1:11.9:0.1:19.05, add deionized water and stir until the solute is completely dissolved to obtain solution A.

[0051] (2) Adjust the pH of solution A to 7 to obtain solution B. Then, the solution B was heated and stirred in a water bath at 75° C. for 3 h to evaporate the solvent to obtain a sol precursor. The resulting sol precursor was dried at 115 °C for 6 days to obtain a fluffy black gel.

[0052] (3) Grinding the obtained black gel in a mortar, and then putting it into a muffle furnace for pre-calcination. Pre-burning is specifically: raising the temperature to 210°C at a heating rate of 6°C / min, and keeping it at this temperature for 2 hours, then raising the temperature to 450°C at a heating rate of 5°C / min, and keeping it at this temperature for 2 hours, so that black The gel is completely burned and decomposed, and finally the temperature is raised to 800°C at a hea...

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Abstract

The invention discloses a low-electric-field high-dielectric adjustable zirconium-doped barium ferrite and a preparation method thereof. The zirconium-doped barium ferrite ceramic is a single-phase material, and part of Fe3+in a BaFe12O19 crystal lattice is replaced by Zr4+ to form Fe2+ which is introduced by zirconium doping and coexists in a system, a stable defect dipole pair is formed betweenthe corresponding Fe2+ and the related Fe3+ in the system, and the obtained zirconium-doped barium ferrite ceramic has a high dielectric constant, high dielectric adjustability and an extremely low dielectric adjustable driving electric field on the basis of excellent magnetic performance. According to the invention, a cooperative sintering process of a sol-gel preparation method, air atmosphere and high-oxygen atmosphere is adopted, the process is simple, the controllability is strong, the preparation period is short, the cost is low, and the single-phase zirconium-doped barium ferrite ceramic material with a high dielectric tuning rate under ultra-low modulation voltage can be obtained. The zirconium-doped barium ferrite ceramic has wide application in the fields of dielectric adjustabledevices and magnetic and electric composite multifunctional devices.

Description

technical field [0001] The invention relates to a zirconium-doped barium ferrite ceramic material with low electric field and high dielectric and a preparation method thereof. The material is simultaneously a magnetic and electric coexisting material, which belongs to the dielectric adjustable and magnetic and electric coexistence Single-phase ceramic field. Background technique [0002] With the rapid development of integrated microelectronic devices, dielectrically tunable materials have attracted extensive attention from researchers due to their huge potential application value. Dielectrically tunable materials can be used to prepare variable capacitors, dielectric phase shifters, filters, mixers, oscillators and other components, and the application prospects are very promising. [0003] At present, more dielectric tunable materials have been studied mainly on ferroelectric materials, including ferroelectric ceramic barium titanate BaTiO 3 (BT) and its solid solution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/63
CPCC04B35/2683C04B35/622C04B35/6303C04B2235/3215C04B2235/3244C04B2235/3272C04B2235/602C04B2235/656C04B2235/6562C04B2235/6583C04B2235/6585
Inventor 杜丕一王敏马宁王宗荣
Owner ZHEJIANG UNIV
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