Single-phase multi-ferreous strontium-ferrite ceramic material and preparation method thereof

A ceramic material and multiferroic technology, which is applied in the field of single-phase multiferroic strontium ferrite ceramic materials and its preparation, can solve the problems of ferroelectricity difficult to saturate polarization and limit applications, and achieve good ferroelectricity and ferroelectricity. Magnetic properties, low equipment requirements, good ferroelectric and ferromagnetic effects

Inactive Publication Date: 2012-06-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large leakage conductance of bismuth ferrite, it is difficult to saturate and polarize the ferroelectricity at room temperature, which greatly limits its application.

Method used

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  • Single-phase multi-ferreous strontium-ferrite ceramic material and preparation method thereof
  • Single-phase multi-ferreous strontium-ferrite ceramic material and preparation method thereof
  • Single-phase multi-ferreous strontium-ferrite ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the Sr / Fe ratio of 1:10, weigh 0.2127g of strontium nitrate and dissolve it in 20ml of deionized water, weigh 4.1017g of ferric nitrate and dissolve it in 20ml of deionized water, and weigh and dissolve 1g of polyethylene glycol (molecular weight: 20000) Prepare in 20ml deionized water. Mix and stir the obtained strontium precursor solution and iron precursor solution for 2 hours, add polyethylene glycol aqueous solution and ammonia water 100ml and mix thoroughly at 50° C. for a certain period of time. The obtained suspended solution was centrifuged, and the centrifuged precipitate was placed in a corundum crucible and sintered at 450°C for 1.5h to remove organic matter. Keep the temperature at 450°C for 1.5h, then cool down to room temperature naturally. Then grind and press into ceramics at 1100°C. The specific steps of sintering are: from room temperature to 1000°C at a rate of 10°C / min, and then from 1000°C at a rate of 5°C / min. to 1100°C, then keep a...

Embodiment 2

[0027] According to the Sr / Fe ratio of 1:8.5, weigh 0.4254g of strontium chloride and dissolve it in 20ml of deionized water, weigh 8.2034g of ferric nitrate and dissolve it in 20ml of deionized water, and weigh 1g of polyethylene glycol (molecular weight: 10000) Dissolve in 20ml deionized water for later use. The obtained strontium precursor solution and iron precursor solution were mixed and stirred for 2 hours, then polyethylene glycol aqueous solution and ammonia water 100ml were added and mixed thoroughly at 50°C for a period of time. Centrifuge the obtained suspended solution, and place the centrifuged precipitate in a corundum crucible to sinter at 350°C for 3 hours to remove organic matter. Keep warm at 350°C for 3h, then cool down to room temperature naturally. Then grind and press the tablet and sinter it into ceramics at 1200°C. The specific steps of sintering are: from room temperature to 950°C at a heating rate of 10°C / min, and then from 950°C to 950°C at a heati...

Embodiment 3

[0030]According to the Sr / Fe ratio of 1:11.5, weigh 0.4254g of strontium nitrate and dissolve in 20ml of deionized water, weigh 8.2034g of ferric nitrate and dissolve in 20ml of deionized water, and weigh 1g of polyethylene glycol (molecular weight: 2000) to dissolve Prepare in 20ml deionized water. Mix and stir the obtained strontium precursor solution and iron precursor solution for 2 hours, add polyethylene glycol aqueous solution and ammonia water 100ml and mix thoroughly at 50° C. for a certain period of time. The obtained suspended solution was centrifuged, and the centrifuged precipitate was placed in a corundum crucible and sintered at 400°C for 2 hours to remove organic matter. Keep warm at 400°C for 2h, then cool down to room temperature naturally. Then grind and press the tablet and sinter it into ceramics at 1350°C. The specific steps of the sintering are: increase the temperature from room temperature to 900°C at a rate of 10°C / min, keep the temperature at this t...

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Abstract

The invention relates to a single-phase multi-ferreous strontium-ferrite ceramic material and a preparation method thereof. The preparation method comprises the following steps: (1) weighing strontium salt and iron salt, forming a precursor solution of strontium and a precursor solution of iron, weighing polyethylene glycol and dissolving in deionized water for standby application; mixing the precursor solutions, stirring, adding the mixed liquid of ammonia and the polyethylene glycol and mixing so as to obtain a suspended solution; centrifugalizing, pouring off liquid at an upper layer, washing precipitates which are centrifugalized out, also calcining and removing organic substances so as to obtain an initial powder body; and grinding, also tabletting and then sintering at high temperature so as to obtain a target product. The single-phase multi-ferreous strontium-ferrite ceramic material and the preparation method thereof have the beneficial effects that the prepared strontium-ferrite ceramic material has multi-ferreous property; meanwhile, the single-phase multi-ferreous strontium-ferrite ceramic material has very good ferroelectricity and ferromagnetism at room temperature; and the single-phase multi-ferreous strontium-ferrite ceramic material and the preparation method thereof have the advantages of simple preparation process, low equipment requirement, easy acquirement of raw materials, low price, small influence to the environment and the like.

Description

technical field [0001] The invention relates to a single-phase multiferroic strontium ferrite ceramic material and a preparation method thereof. Background technique [0002] Multiferroic materials integrate the properties of ferroelectricity, ferromagnetism and ferroelasticity, and have unique coupling effects between multiple fields (force, electricity, magnetism, heat and light), showing many important coupling properties, such as magnetic Electricity, piezoelectricity, pyroelectricity and piezomagnetic effects are important advanced functional materials. The coupling properties of these materials provide a great degree of freedom for device design, so that they can be developed into various sensors, transducers, drivers and information storage, which are used in aerospace, automotive industry, biology, medicine, information and other technical fields , has aroused widespread concern internationally. [0003] Strontium hexagonal ferrite with magnetoplumbite structure ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 谭国龙陈秀娜
Owner WUHAN UNIV OF TECH
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