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Novel room-temperature multi-ferroic ceramic with high polarization intensity and preparation method of novel room-temperature multi-ferroic ceramic

A technology of multiferroic ceramics and polarization strength, applied in the field of functional ceramics, can solve the problems that cannot be improved at the same time, limit the application of BFO-based multiferroic materials, etc., and achieve the effects of easy industrial production, easy parameter control, and reduced system loss.

Active Publication Date: 2016-12-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the ferromagnetic and ferroelectric properties are mutually restricted, and cannot be improved simultaneously in the same single-phase system, which greatly limits the application of BFO-based multiferroic materials.

Method used

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  • Novel room-temperature multi-ferroic ceramic with high polarization intensity and preparation method of novel room-temperature multi-ferroic ceramic
  • Novel room-temperature multi-ferroic ceramic with high polarization intensity and preparation method of novel room-temperature multi-ferroic ceramic
  • Novel room-temperature multi-ferroic ceramic with high polarization intensity and preparation method of novel room-temperature multi-ferroic ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Composition of multiferroic ceramics:

[0048] 0.75BiFeO 3 -0.25Ba 0.85 Ca 0.15 Ti 0.90 Zr 0.10 o 3 +0.5wt%MnCO 3

[0049] (1) Calculate the composition Bi in the powder raw material according to the composition of the above chemical formula 2 o 3 、BaCO 3 、TiO 2 , ZrO 2 , CaCO 3 , MnCO 3 , Fe 2 o 3 The quality and according to composition ratio preparation, mixed with wet ball milling method, briquette after drying, obtain ceramic powder after calcining, mix 24 hours according to the mass ratio of raw material: ball: alcohol=1:2:1, make each component well mixed. After drying, pass through a 40-mesh sieve, briquette, heat up to 800°C at a heating rate lower than 5°C / min in an air atmosphere, and keep warm for 5 hours to synthesize ceramic powder.

[0050] (2) Grinding the ceramic powder obtained in step (1) and passing through a 40-mesh sieve. Then according to the mass ratio of raw material: ball: alcohol=1:2:0.8, finely grind for 24 hours, and dry th...

Embodiment 2

[0056] Composition of multiferroic ceramics:

[0057] 0.75 (0.98BiFeO 3 -0.02BiGaO 3 )-0.25Ba 0.85 Ca 0.15 Ti 0.90 Zr 0.10 o 3 +0.5wt%MnCO 3

[0058] Repeat the preparation method of Example 1 by the above-mentioned formula.

[0059] (1) Measure the electric hysteresis loop, magnetic hysteresis loop and piezoelectric performance of the ceramic element in this embodiment at room temperature, and the test results are shown in Table 1.

[0060] (2) The measurement of the hysteresis loop under room temperature is carried out to the ceramic element of the present embodiment, test result sees figure 1 , the remnant polarization reaches 43.86μC / cm 2 , an obvious polarization current reversal peak can be observed, indicating that there are a large number of electric domain reversals in the system under electric field loading, and after polarization treatment d 33 It is 90pC / N, indicating that the ceramic element has excellent ferroelectricity; figure 2 In order to measure...

Embodiment 3

[0062] Composition of multiferroic ceramics:

[0063] 0.75 (0.75BiFeO 3 -0.04BiGaO 3 )-0.25Ba 0.85 Ca 0.15 Ti 0.90 Zr 0.10 o 3 +0.5wt%MnCO 3

[0064] Repeat the preparation method of Example 1 by the above-mentioned formula.

[0065] (1) Measure the electric hysteresis loop, magnetic hysteresis loop and piezoelectric performance of the ceramic element in this embodiment at room temperature, and the test results are shown in Table 1.

[0066] The main test results of Examples 1, 2, and 3 are respectively listed in the following table 1. In the table, Pr is the remanent polarization, Ms is the saturation magnetization, Mr is the remanent magnetization, and Ec is the magnetic coercive field;

[0067]Table 1 Test conditions (100mHz) and remanent polarization Pr properties of ceramic materials at room temperature

[0068]

[0069] It can be seen from Table 1 that by introducing BiGaO into the BFO-BCZT system 3 , can greatly improve the multiferroic properties of the s...

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Abstract

The invention relates to novel room-temperature multi-ferroic ceramic with high polarization intensity and a preparation method of the novel room-temperature multi-ferroic ceramic. The chemical composition of a room-temperature multi-ferroic ceramic material is 0.75 ((1-x)BiFeO<3>-xBiGaO<3>)-0.25Ba<0.85>Ca<0.15>Ti<0.90>Zr<0.10>O3 +yMnCO<3>, wherein x is greater than 0 and is smaller than or equal to 0.05, and y is smaller than or equal to 0.5wt%. By adjusting and controlling components, the novel room-temperature multi-ferroic ceramic material simultaneously having excellent ferromagnetism and excellent ferroelectricity is obtained, and has high remanent polarization intensity (22-44 [mu]C / cm<2>) and high ferromagnetism properties (0.09-0.27emu / g).

Description

technical field [0001] The invention belongs to the field of functional ceramics, and relates to a room temperature multiferroic ceramic material, in particular to a bismuth ferrite-based multiferroic ceramic material and a preparation method thereof. Background technique [0002] Multiferroic material refers to a new multifunctional material with two or more properties of ferromagnetism, ferroelectricity and ferroelasticity at the same time, in which the magnetoelectric coupling effect caused by the order of magnetism and electricity can The generation of magnetic polarization and electric polarization under an external magnetic field provides an additional degree of freedom for the design of information recording devices, and it has broad application prospects in new sensors, spintronic devices, and high-density memory devices. [0003] BiFeO 3 (BFO) is a multiferroic material with ferroelectricity and G-type antiferromagnetism at room temperature, with high Curie tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B41/88
CPCC04B35/26C04B41/009C04B41/5116C04B41/88C04B2235/3208C04B2235/3215C04B2235/3232C04B2235/3244C04B2235/3262C04B2235/3286
Inventor 董显林刘宁涛梁瑞虹
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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