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Lead magnesium niobate-lead titanate-bismuth ferrite multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and lead magnesium niobate, which is applied to the magnetism of inorganic materials, magnetic objects, circuits, etc., can solve the problems of difficult saturation polarization, weak ferromagnetism of bismuth ferrite, etc., and achieve low cost, low cost, The effect of simple process

Inactive Publication Date: 2017-12-22
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its ferroelectric Curievan T C =830°C, antiferromagnetic Neel temperature T N = 370°C, but due to the large leakage of bismuth ferrite, it is difficult to saturate and polarize the ferroelectricity at room temperature, and the ferromagnetism of bismuth ferrite is very weak, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Lead magnesium niobate-lead titanate ceramic material. Its chemical composition is:

[0030] (1-x)[(1-y)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +yPbTiO 3 ]+xBiFeO 3 , where x=0.01, y=0.31.

[0031] The specific process operation process method is as follows:

[0032] 1. Weighing ball mill: according to (1-x)[(1-y)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +yPbTiO 3 ]+xBiFeO 3 , where x = 0.01, y = 0.31, the required synthetic formula is stoichiometrically proportioned, adding absolute ethanol and putting it into a ball milling tank for ball milling, and then ball milling for several hours at an appropriate speed.

[0033] 2. Drying and tableting: Dry the ball-milled slurry, take out the dried powder and grind it, pour it into a mold and press it under a certain pressure.

[0034]3. Pre-calcination: put the compressed tablet into a muffle furnace for calcination and synthesis. Preheat at 550°C for 1.5-2 hours, then raise the temperature to 850°C for 2 hours.

[0035] 4. Secondary ball milling an...

Embodiment 2

[0042] Lead magnesium niobate-bismuth ferrite ceramic material. Its chemical composition is:

[0043] (1-x)[(1-y)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +yPbTiO 3 ]+xBiFeO 3 , where x=0.02, y=0.33.

[0044] The specific process operation process method is as follows:

[0045] 1. Weighing ball mill: according to (1-x)[(1-y)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +yPbTiO 3 ]+xBiFeO 3 , where x=0.01, y=0.32 The formula to be synthesized is stoichiometrically proportioned, adding absolute ethanol and putting it into a ball milling tank for ball milling, and then ball milling at an appropriate speed for several hours.

[0046] 2. Drying and tableting: Dry the ball-milled slurry, take out the dried powder and grind it, pour it into a mold and press it under a certain pressure.

[0047] 3. Pre-calcination: put the compressed tablet into a muffle furnace for calcination and synthesis. Preheat at 600°C for 1.5-2 hours, then raise the temperature to 850°C for 2 hours.

[0048] 4. Secondary ball milling and d...

Embodiment 3

[0055] Lead magnesium niobate-lead titanate ceramic material. Its chemical composition is:

[0056] (1-x)[(1-y)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +yPbTiO 3 ]+xBiFeO 3 , where x=0.05, y=0.39.

[0057] The specific process operation process method is as follows:

[0058] 1. Weighing ball mill: according to (1-x)[(1-y)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +yPbTiO 3 ]+xBiFeO 3 , where x=0.05, y=0.39 The formula to be synthesized is stoichiometrically proportioned, adding absolute ethanol and putting it into a ball milling tank for ball milling, and then ball milling at a suitable speed for several hours.

[0059] 2. Drying and tableting: Dry the ball-milled slurry, take out the dried powder and grind it, pour it into a mold and press it under a certain pressure.

[0060] 3. Pre-calcination: put the compressed tablet into a muffle furnace for calcination and synthesis. Preheat at 650°C for 1.5-2 hours, then raise the temperature to 850°C for 2 hours.

[0061] 4. Secondary ball milling and drying:...

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Abstract

The invention discloses a lead magnesium niobate-lead titanate-bismuth ferrite multiferroic ceramic material and a preparation method thereof. The lead magnesium niobate-lead titanate-bismuth ferrite multiferroic ceramic material comprises a novel ferroelectric and ferromagnetic composite ceramic material formed by adding bismuth ferrite into lead magnesium niobate (PMN)-lead titanate (PT) serving as a matrix. The material comprises the chemical components: (1-x)[(1-y)Pb(Mg1 / 3Nb2 / 3)O3+yPbTiO3]+xBiFeO3, x is equal to 0.01-0.05, and y is equal to 0.30-0.39. The lead magnesium niobate-lead titanate-bismuth ferrite multiferroic ceramic material is simple in process and low in cost, and the spontaneous polarization intensity and magnetic property of the material can be improved by regulation. The multiferroic ceramic material is relatively low in raw material cost, simple in preparation process and easy to store and use; and the multiferroic magnetoelectric composite can be widely applied to aspects such as sensors, energy converters, filters, oscillators and storages due to a remarkable magnetoelectric effect at room temperature.

Description

technical field [0001] The invention relates to the field of functional materials, more specifically a lead magnesium niobate-lead titanate-bismuth ferrite multiferroic ceramic material and a preparation method thereof. Background technique [0002] Multiferroic materials are a new type of functional materials that contain both magnetic order and ferroelectric order. At a certain temperature, ferroelectricity and ferromagnetism coexist in multiferroic materials, and they have magnetoelectric coupling properties. The mutual coupling and regulation of different order parameters in the multiferroic system can not only achieve the requirements of multifunctionality, miniaturization and low energy consumption in the device, but also design and develop many new magnetoelectric devices, including high-speed memory, multiferroic Tunneling devices and magnetic field sensors, etc. Multiferroic materials have become one of the research hotspots in the field of functional materials, an...

Claims

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Application Information

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IPC IPC(8): C04B35/497C04B35/472C04B35/622H01F1/01H01F13/00
CPCC04B35/472C04B35/497C04B35/622C04B2235/3272C04B2235/6562C04B2235/661H01F1/01H01F13/00
Inventor 孙大志张志国田瑞何小玉焦珊严飒朱俊伟宋飞飞何小骏王艳许邵娜娜黄彦青陆洁
Owner SHANGHAI NORMAL UNIVERSITY
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