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Barium titanate ceramic with wide curie temperature region and preparation method thereof

A technology of barium titanate and ceramics, applied in the field of barium titanate ceramics and its preparation, can solve the problems of low powder purity, high sintering temperature, poor phase stability, etc., and achieve easy control of doping amount and low sintering temperature , The effect of low equipment requirements

Active Publication Date: 2018-07-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used method for preparing barium titanate ceramics is based on BaCO 3 、TiO 2 The raw material is obtained by the traditional solid-state reaction method, and on this basis, a single valence doping element is added to replace Ti 4+ To broaden the Curie temperature range, but due to the narrow thermodynamic stability range of barium titanate, there are disadvantages such as low powder purity, high sintering temperature, and poor phase stability during the preparation process of solid-state method, and the prepared ceramics often have The Curie peak value is low, and the effect of widening the Curie temperature zone is not obvious, etc.

Method used

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  • Barium titanate ceramic with wide curie temperature region and preparation method thereof
  • Barium titanate ceramic with wide curie temperature region and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] To prepare barium titanate ceramics with a wide Curie temperature zone, the specific steps are as follows:

[0040] Dissolve 7.740g of barium acetate and 0.040g of samarium nitrate hexahydrate in 25mL of glacial acetic acid to obtain a barium source solution, dissolve 20.838g of tetrabutyl titanate in 20mL of ethylene glycol methyl ether to obtain a titanium source solution, and then dissolve the barium The source solution and the titanium source solution were mixed (molar ratio Ba:Ti:Sm=1:2:0.003), stirred for 12 hours to obtain a barium dititanate precursor sol, and the resulting sol was aged in air for 4 hours, and then placed at 120°C Dry in an electric blast drying oven for 24 hours to obtain barium dititanate precursor xerogels, grind the xerogels and pre-calcine them, and heat them up to 850°C at room temperature for 3 hours at a rate of 4°C / min to obtain the two Barium titanate powder, the powder is ball milled for 10h (the speed of the ball mill is 540 rpm), th...

Embodiment 2

[0044] To prepare barium titanate ceramics with a wide Curie temperature zone, the specific steps are as follows:

[0045] Dissolve 7.740g of barium acetate and 0.054g of europium nitrate hexahydrate in 25mL of glacial acetic acid to obtain a barium source solution, dissolve 20.838g of tetrabutyl titanate in 20mL of ethylene glycol methyl ether to obtain a titanium source solution, and then dissolve the barium The source solution and the titanium source solution were mixed (molar ratio Ba:Ti:Eu=1:2:0.004), stirred for 12 hours to obtain a barium titanate precursor sol, and the obtained sol was aged in air for 4 hours, and then placed in 120°C Dry in an electric blast drying oven for 24 hours to obtain barium dititanate precursor xerogels, grind the xerogels and pre-calcine them, and heat them up to 850°C at room temperature for 3 hours at a rate of 4°C / min to obtain the two For barium titanate powder, ball mill the powder for 10 hours, then dry the ball-milled slurry, add 5 wt...

Embodiment 3

[0049] To prepare barium titanate ceramics with a wide Curie temperature zone, the specific steps are as follows:

[0050] 7.740g of barium acetate and 0.052g of cerium acetylacetonate (III) hydrate were dissolved in 25mL of glacial acetic acid to obtain a barium source solution, 20.838g of tetrabutyl titanate was dissolved in 20mL of ethylene glycol methyl ether to obtain a titanium source solution, and then Mix the barium source solution and the titanium source solution at room temperature (molar ratio Ba:Ti:Ce=1:2:0.004), stir for 12 hours to obtain a barium dititanate precursor sol, place the obtained sol in air and age it for 4 hours, Put it in a 120°C electric blast drying oven and dry it for 24 hours to obtain the dry gel of barium titanate precursor. After the dry gel is ground, it is pre-calcined. At room temperature, the temperature is raised to 900°C at a rate of 4°C / min. 5h, to obtain the barium titanate powder, ball mill the powder for 10h, then dry the ball-mille...

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Abstract

The invention relates to barium titanate ceramic with a wide curie temperature region and a preparation method thereof. The preparation method comprises the following steps: 1) dissolving one of cerium-2,4-pentanedionate hydrate, samarium nitrate hexahydrate and europium nitrate hexahydrate into glacial acetic acid together with barium acetate to obtain a barium-source solution; 2) dissolving tetrabutyl titanate into ethylene glycol monomethyl ether to obtain a titanium-source solution; 3) mixing the barium-source solution with the titanium-source solution, aging and drying obtained sol to obtain xerogel and then presintering, balling and drying to obtain barium titanate powder; 4) sequentially granulating, dry pressing and shaping, discharging sol and pressurelessly sintering the barium titanate to obtain barium titanate ceramic. The barium titanate ceramic disclosed by the invention has a wider curie temperature region, can meet design and use requirements of high-temperature ferroelectric devices and further has the advantage of good single phase.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a barium titanate ceramic with a wide Curie temperature range and a preparation method thereof. Background technique [0002] Ferroelectric materials have many excellent properties such as piezoelectricity, pyroelectricity, ferroelectricity, electro-optic properties, acousto-optic properties, etc., and are widely used in modern industry, among which ferroelectric memory, drive, sensor and pyroelectric Detectors are often used in high-temperature environments, and when the operating temperature is higher than the Curie temperature of ferroelectric materials, the dielectric constant of general ferroelectric materials decreases significantly, and the dielectric loss increases sharply, making them unable to work normally. [0003] Barium dititanate has the advantages of high Curie temperature (about 470°C) and lead-free, but due to the narrow Curie temperature r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/624
CPCC04B35/468C04B35/624C04B2235/443C04B2235/48C04B2235/96
Inventor 戴英刘俊君裴新美陈文
Owner WUHAN UNIV OF TECH
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