Preparation method for high resistivity bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material

A technology of ceramic materials and high resistivity, which is applied in ferrimagnetic materials and ferroelectric fields, can solve the problems of low insulation resistivity, hysteresis loops that are difficult to appear saturated, weak magnetoelectric coupling effect, etc., and achieve electrical insulation performance Excellent, guaranteed consistent and reproducible results

Inactive Publication Date: 2012-04-25
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] There are three key issues restricting BFO ceramics from becoming practical materials: 1) BFO ceramics prepared by general electronic ceramic technology contain a large amount of Bi 2 Fe 4 o 9 and Bi 25 FeO 39 and other non-perovskite phases that do not have ferroelectric and magnetic order; 2) BFO-based ceramics due to the presence of Fe 2+ Ions and the resulting oxygen vacancies tend to show very low insulation resistivity, and it is difficult to appear a saturated hysteresis loop at room temperature; 3) The antiferromagnetism of BFO ceramics makes the magnetoelectric coupling effect very weak
Although materials researchers have been working towards the above goals for more than 10 years, so far, no breakthrough research progress has been reported in terms of use value

Method used

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  • Preparation method for high resistivity bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material

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preparation example Construction

[0028] The preparation method of the ceramic material of the present invention is implemented according to the following steps.

[0029] The first step, according to the general formula (1-x)BiFeO of ceramic material chemical composition 3 -xBaTiO 3 , where 0.05≤x≤0.40, the raw material is weighed according to the stoichiometric ratio of the material composition, wherein the raw material is an electronic grade chemical reagent Bi 2 o 3 , Fe 2 o 3 、TiO 2 and BaCO 3 , the material composition stoichiometric ratio is Bi 2 o 3 : Fe 2 o 3 :TiO 2 : BaCO 3 =(1-x) / 2:(1-x) / 2:x:x; Place the weighed raw materials in a nylon tank, add agate balls and liquid dispersion medium, and follow the raw materials, agate balls and liquid The weight ratio of the dispersion medium is 1:1:1, ball milling on a planetary ball mill for 6-8 hours to achieve full mixing, and place the mixed slurry in a constant temperature drying oven at 100°C±10°C for 2-4h; Wherein, the ball milling liquid di...

Embodiment 1

[0037] 1) By the general formula (1-x) BiFeO 3 -xBaTiO 3 The magnetoelectric solid solution ceramics indicated, when x=0.25, the ceramic material is 0.75BiFeO 3 -0.25BaTiO 3 , according to the stoichiometric ratio Bi of the chemical composition of the material 2 o 3 : Fe 2 o 3 :TiO2 : BaCO 3 = 0.375: 0.375: 0.25: 0.25 Weigh the raw materials; place the weighed raw materials in a nylon tank, add agate grinding balls and absolute ethanol, according to the weight ratio of raw materials, agate grinding balls and absolute ethanol is 1:1 : 1 ball milling on a planetary ball mill for 7 hours to achieve full mixing; place the mixed slurry in a constant temperature drying oven and dry at 100°C for 3 hours;

[0038] 2) Put the dried mixed powder into Al 2 o 3 In the crucible, cover it and put it in a box-type high-temperature electric furnace for pre-synthesis. The pre-synthesis temperature is 750 ° C, the holding time is 2 hours, and then it is naturally cooled with the furnac...

Embodiment 2

[0044] 1) By the general formula (1-x) BiFeO 3 -xBaTiO 3 The magnetoelectric solid solution ceramics indicated, when x=0.35, the ceramic material is 0.65BiFeO 3 -0.35BaTiO 3 , according to the stoichiometric ratio Bi of the chemical composition of the material 2 o 3 : Fe 2 o 3 :TiO 2 : BaCO 3 = 0.325: 0.325: 0.35: 0.35 Weigh the raw materials; put the weighed raw materials in a nylon tank, add agate grinding balls and absolute ethanol, according to the weight ratio of raw materials, agate grinding balls and absolute ethanol is 1:1 : 1 ball milling on a planetary ball mill for 6 hours to achieve full mixing; place the mixed slurry in a constant temperature drying oven and dry at 100°C for 3 hours;

[0045] 2) Put the dried mixed powder into Al 2 o 3 In the crucible, cover it and put it in a box-type high-temperature electric furnace for pre-synthesis. The pre-synthesis temperature is 820 ° C, the holding time is 2 hours, and then it is naturally cooled with the furnac...

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Abstract

The present invention discloses a preparation method for a high resistivity bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material. The method comprises the following steps: 1) based on a general formula of a ceramic material, weighing raw materials according to a stoichiometric ratio, placing the raw materials in a ball mill to carry out wet milling and mixing, and drying; 2) placing the mixed powder in a box type high temperature electric furnace to carry out pre-synthesis; 3) carrying out coarse crushing, wet milling, and fine crushing for the pre-synthesized material, then drying, carrying out mixing and pelletizing for the dried powder and a binder, then carrying out pressing to prepare a thin disc biscuit; 4) carrying out heat preservation and binder removing for the biscuit; 5) carrying out sintering and heat preservation for the binder-removed biscuit to obtain the bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material. According to the present invention, the bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material of the present invention has characteristics of a complete perovskite structure and excellent electrical insulation property, the Curie temperature of the ferroelectricity material is more than 350 DEG C, the Curie temperature of the ferromagnetic material (the anti-ferromagnetic material) is more than 350 DEG C, the room temperature remanent polarization Pr is more than 18 muC / cm<2>, the remanent magnetization Mr is 0.49 emu / g, such that the multiferroic material with the high magnetoelectric coupling coefficient has the application and development value.

Description

technical field [0001] The invention relates to ferroelectric and ferrimagnetic materials, in particular to a preparation method of a bismuth ferrite-barium titanate solid solution magnetoelectric coupling ceramic material with a perovskite structure. Background technique [0002] Perovskite structure bismuth ferrite (BiFeO 3 , BFO) has both ferroelectricity and antiferromagnetism at room temperature, and is an emerging research hotspot—one of the few most attractive materials among multiferroic single-phase materials. In the more than 50 years since Royen and Swars first synthesized this multiferroic material in 1957, a lot of research has been done on the structure of BFO and the existence and mechanism of its polarization order and magnetic order, and it has been proved that at room temperature it At the same time, it has two ordered structures, ferroelectric and antiferromagnetic, and the ferroelectric Curie temperature T C Between 820 and 850°C, the antiferromagnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 魏永星王晓莉王晓涛贾江江
Owner XI AN JIAOTONG UNIV
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