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Bismuth ferrite-based ceramic with excellent magnetoelectric properties and preparation method thereof

A bismuth ferrite-based ceramic and bismuth ferrite-based technology, applied in the field of dielectric materials, can solve the problems of weak magnetoelectric properties, poor macroscopic magnetic properties, etc., and achieve the effects of improved magnetic properties, excellent magnetic properties, and improved performance.

Active Publication Date: 2021-03-23
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For existing BiFeO 3 The defects of poor macroscopic magnetic properties and weak magnetoelectric properties of ceramics, the present invention is a kind of bismuth ferrite-based ceramics with excellent magnetoelectric properties, through the co-doping of A site and B site, the Curie ferroelectric transition temperature T is controlled C 、Néel temperature T N and the range of the difference, the bismuth ferrite-based ceramics with excellent magnetoelectric properties are obtained

Method used

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  • Bismuth ferrite-based ceramic with excellent magnetoelectric properties and preparation method thereof
  • Bismuth ferrite-based ceramic with excellent magnetoelectric properties and preparation method thereof
  • Bismuth ferrite-based ceramic with excellent magnetoelectric properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A bismuth ferrite-based ceramic with excellent magnetic properties in this embodiment has a chemical composition of:

[0056] 0.84BiFeO 3 -0.06SmFeO 3 -0.1CaTiO 3 .

[0057] The concrete preparation steps of this ceramic material are as follows:

[0058] Ingredients: Put the raw materials in an oven at 80°C for 24 hours to remove any moisture that may exist. 3 -0.06SmFeO 3 -0.1CaTiO 3The stoichiometric ratio of various elements in the formula weighs high-purity (greater than 99%) Bi 2 o 3 , Fe 2 o 3 、Sm 2 o 3 , CaCO 3 、TiO 2 .

[0059] One-time ball milling: Put the raw materials weighed according to the stoichiometric ratio into a nylon tank, put zirconia balls as the ball milling medium, add deionized water, and put them on the ball mill for ball milling to make them evenly mixed. The ball milling time is 24 hours and the speed is 200r / min.

[0060] Drying and sieving: Pour the above slurry into a drying dish, put it in an oven, and dry it for 48 hour...

Embodiment 2

[0070] A bismuth ferrite-based ceramic with excellent magnetic properties in this embodiment has a chemical composition of:

[0071] 0.81BiFeO 3 -0.06SmFeO 3 -0.1CaTiO 3 -0.03BiMnO 3 .

[0072] Concrete preparation steps are as follows:

[0073] Ingredients: Put the raw materials in an oven at 80°C for 24 hours to remove any moisture that may exist. 3 -0.06SmFeO 3 -0.1CaTiO 3 -0.03BiMnO 3 The stoichiometric ratio of various elements in the formula weighs high-purity (greater than 99%) Bi 2 o 3 , Fe 2 o 3 、Sm 2 o 3 , CaCO 3 、TiO 2 , Mn 2 o 3 .

[0074] One-time ball milling: Put the raw materials weighed according to the stoichiometric ratio into a nylon tank, put zirconia balls as the ball milling medium, add deionized water, and put them on the ball mill for ball milling to make them evenly mixed. The ball milling time is 24 hours and the speed is 200r / min.

[0075] Drying and sieving: Pour the above slurry into a drying dish, put it in an oven, and dry i...

Embodiment 3

[0085] In this embodiment, a bismuth ferrite-based ceramic with excellent magnetic properties has a chemical composition of

[0086] 0.79BiFeO 3 -0.06SmFeO 3 -0.1CaTiO 3 -0.05BiMnO 3 .

[0087] Concrete preparation steps are as follows:

[0088] Ingredients: Put the raw materials in an oven at 80°C and dry them for 24 hours to remove any moisture that may exist. 3 -0.06SmFeO 3 -0.1CaTiO 3 -0.05BiMnO 3 The stoichiometric ratio of various elements in the high-purity Bi 2 o 3 , Fe 2 o 3 、Sm 2 o 3 , CaCO 3 、TiO 2 , Mn 2 o 3 .

[0089] One-time ball milling: Put the raw materials weighed according to the stoichiometric ratio into a nylon tank, put zirconia balls as the ball milling medium, add deionized water, and put them on the ball mill for ball milling to make them evenly mixed. The ball milling time is 24 hours and the speed is 200r / min.

[0090] Drying and sieving: Pour the above slurry into a drying dish, put it in an oven, and dry it for 48 hours. After...

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Abstract

The invention discloses bismuth ferrite-based ceramic with excellent magnetoelectric properties and a preparation method of the bismuth ferrite-based ceramic. The bismuth ferrite-based ceramic is a bismuth ferrite-based ceramic material with co-doping at an A position and a B position, the Curie ferroelectric transition temperature TC of the bismuth ferrite-based ceramic material is higher than the Neel temperature TN, and the difference value between the TC and the TN ranges from 10 DEG C to 60 DEG C. The bismuth ferrite-based ceramic is prepared by adopting a standard solid-phase reaction sintering method, and the method comprises the following steps: proportioning raw materials according to a stoichiometric ratio, carrying out primary ball milling, conducting sieving, conducting presintering at 860-880 DEG C to obtain pre-synthesized powder, and carrying out secondary ball milling, sieving, granulating, tabletting and other processes to obtain a BiFeO3-based ceramic green body withexcellent magnetic properties; and finally, conducting sintering at a high temperature of 900-950 DEG C to obtain the BiFeO3-based ceramic material. The preparation method is stable and reliable, theprocess is simple and easy to operate, and large-scale production can be performed; and the bismuth ferrite-based ceramic with uniform components, compact structure and excellent performance can be prepared.

Description

technical field [0001] The invention relates to the field of dielectric materials, in particular to a bismuth ferrite-based ceramic material with excellent magnetoelectric properties and a preparation method thereof. Background technique [0002] In recent years, with the miniaturization and integration of electronic components, this has put forward higher requirements for electronic materials. The magnetoelectric memory device (MeRAM) based on magnetoelectric coupling can combine the advantages of magnetic memory and ferroelectric memory, that is, to achieve fast reading through magnetic spin, and to write using polarization inversion at the same time, realizing the storage process. Fast reads and writes. Magnetic sensors based on the magnetoelectric effect can detect weak magnetic fields and are used in navigation, aviation, medical detection, geological exploration, information processing, etc. In addition, magnetoelectric materials have potential applications in energy...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/626C04B35/634C04B35/64
CPCC04B35/26C04B35/622C04B35/6261C04B35/62655C04B35/62645C04B35/63416C04B35/64C04B2235/3298C04B2235/3224C04B2235/3208C04B2235/3236C04B2235/3268C04B2235/6562C04B2235/6567C04B2235/96Y02B30/00
Inventor 刘娟王乐江崔冰牛苗苗徐东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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