Multiferroic ceramics with room-temperature highly ferromagnetic-ferroelectric and highly-magnetic dielectric effects and preparation method of multiferroic ceramics

A technology of multiferroic ceramics and dielectric effect, applied in the field of multiferroic ceramics and its preparation, can solve the problems of weak ferroelectricity and ferromagnetism, low magnetodielectric effect, etc., and achieve good ferromagnetism and ferroelectricity , good comprehensive performance and huge economic application value

CN103030386AInactive Publication Date: 2013-04-10HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-04-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses multiferroic ceramics with room-temperature highly ferromagnetic-ferroelectric and highly-magnetic dielectric effects and a preparation method of the multiferroic ceramics, relates to multiferroic ceramics and a preparation method thereof, and aims to solve the problem in the prior art that the existing BiFeO3-based solid soluble multiferroic ceramics have poor ferroelectricity and ferromagnetism at room temperature and lower magnetic dielectric effect as well. The multiferroic ceramics have the chemical formula of (1-x)Ba0.70Ca0.30TiO(3-x)BiFeO3. The method comprises the following steps: (1) weighing raw materials; (2) mixing the raw materials, performing ball-milling, drying and compacting to obtain to-be-prefired pellets; (3) prefiring the to-be-prefired pellets to obtain presintered pellets; and (4) grinding the presintered pellets, performing ball-milling, adding a polyvinyl alcohol solution as binder, grinding, sieving, compacting to obtain to-be-sintered sheets, removing the binder, burying the sheets in a powdery material of the same composition, sintering to obtain ceramics, and polishing the ceramic blocks to obtain the final products of multiferroic ceramics with room-temperature highly ferromagnetic-ferroelectric and highly-magnetic dielectric effects. The multiferroic ceramics can be applied in the field of multiferroic materials.
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Description

technical field

[0001] The invention relates to a multiferroic ceramic and a preparation method thereof. Background technique

[0002] With the rapid development of science and technology, the miniaturization and multifunctionalization of devices have made people have higher and higher requirements for multifunctionality and size of materials. Functional materials with only ferroelectric and ferromagnetic properties can no longer meet the requirements of science and technology. According to the needs of development, multiferroic materials not only have a single ferroelectricity, ferromagnetism and other properties, but also can produce some new functions through ferrocoupling and synergy, such as magnetoelectric effect, magneto-optical effect and magnetodielectric effect, etc. , so that people can control the electric polarization through the external magnetic field or control the magnetization through the external electric field. It has great development potential in inform...

Examples

specific Embodiment approach 1

[0019] Specific embodiment 1: The chemical formula of the multiferroic ceramics with high ferromagnetism-ferroelectricity and high magnetodielectric effect in this embodiment is (1-x)Ba 0.70 Ca 0.30 TiO 3 -xBiFeO 3 , where x is the mole fraction, 0.52≤x≤0.70.

specific Embodiment approach 2

[0020] Specific embodiment two: the preparation method of the multiferroic ceramics of room temperature high ferromagnetism-ferroelectricity and high magnetodielectric effect of this embodiment, carries out according to the following steps:

[0021] 1. The raw material BaCO 3 , CaCO 3 、TiO 2 、 Bi 2 o 3 and Fe 2 o 3 Press (1-x)Ba 0.70 Ca 0.30 TiO 3 -xBiFeO 3 Stoichiometric ratio weighing of chemical formula, where 0.52≤x≤0.70;

[0022] 2. Mix the raw materials weighed in step 1, use absolute ethanol as the medium, and wet ball mill for 24-26 hours at a speed of 125-140 rpm, then dry at 50°C, and keep the pressure at 10-15MPa 1min~2min, the obtained diameter is 30~35mm, the thickness is 3~5mm to wait for calcined pressed tablet; Wherein the ratio of the quality of absolute ethanol and raw material total mass is (1.3~1.5): 1; The used grinding ball of ball mill is made of Agate balls with a diameter of 20mm, a diameter of 10mm and a diameter of 6mm are composed of agat...

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment is different from Embodiment 2 in that: in step 1, x=0.67. Others are the same as in the second embodiment.