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Acid bismuth ceramic with multiferroic holmium and chrome codoping iron at room temperature and preparation method of acid bismuth ceramic

A room temperature multiferroic and multiferroic ceramic technology, applied in the field of electronic ceramic materials, can solve the problems of limiting the application of bismuth ferrite materials, binding bismuth ferrite, etc.

Inactive Publication Date: 2012-10-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large leakage current suppresses the ferroelectric properties of bismuth ferrite; the intrinsic helical antiferromagnetic structure constrains the magnetic properties of bismuth ferrite, thus limiting the application of bismuth ferrite materials

Method used

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  • Acid bismuth ceramic with multiferroic holmium and chrome codoping iron at room temperature and preparation method of acid bismuth ceramic
  • Acid bismuth ceramic with multiferroic holmium and chrome codoping iron at room temperature and preparation method of acid bismuth ceramic
  • Acid bismuth ceramic with multiferroic holmium and chrome codoping iron at room temperature and preparation method of acid bismuth ceramic

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Experimental program
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Effect test

Embodiment 1

[0021] (1) The raw material Ho 2 o 3 、 Bi 2 o 3 、Cr 2 o 3 and Fe 2 o 3 , giving the general formula Bi in stoichiometric ratio 0。9 Ho 0。 1 Fe 0。995 Cr 0。005 o 3 For the batching, absolute ethanol and zirconia balls are used as the ball milling medium at a speed of 400r / min, and the ball milling takes 24 hours. After drying, it was calcined at 750°C for 2h, mixed with polyvinyl alcohol solution (PVA, 5% mass fraction), and then pressed into a disc with a diameter of 10mm and a thickness of 1mm under a pressure of 100MPa, and then deglued at 550°C for 4h. Finally, it is sintered into porcelain at 800°C. The XRD pattern of its ceramic target material (see figure 1 ) is fully consistent with BiFeO 3 The PDF71-2494 diffraction standard spectrum shows that the obtained material has no impurity phase production, and Bi 0。9 Ho 0。1 Fe 0。99 5Cr 0。 005 o 3 Mutually.

[0022] (2) The holmium and chromium co-doped bismuth ferrite ceramics produced by step (1) have a r...

Embodiment 2

[0024] (1) The raw material Ho 2 o 3 、 Bi 2 o 3 、Cr 2 o 3 and Fe 2 o 3 , giving the general formula Bi in stoichiometric ratio 0。9 Ho 0。 1 Fe 0。9 Cr 0。1O3 For the batching, absolute ethanol and zirconia balls are used as the ball milling medium at a speed of 400r / min, and the ball milling takes 24 hours. After drying, it was calcined at 830°C for 2h, mixed with polyvinyl alcohol solution (PVA, mass fraction 5%), and then pressed into a disc with a diameter of 10mm and a thickness of 1mm under a pressure of 120MPa, and then deglued at 550°C for 4h. Finally, it is sintered into porcelain at 870°C. The XRD pattern of its ceramic target material (see Figure 4 ) is fully consistent with BiFeO 3 PDF 71-2494 diffraction standard spectrum, indicating that there is no impurity phase production, and Bi 0。9 Ho 0。1 Fe 0。9 Cr 0。1 o 3 Mutually.

[0025] (2) The holmium and chromium co-doped bismuth ferrite ceramics produced by step (1) have a remanent polarization value...

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Abstract

The invention relates to acid bismuth ceramic with multiferroic holmium and chrome codoping iron at room temperature and a preparation method of the acid bismuth ceramic, and belongs to the field of electronic ceramic materials. The ceramic has the chemical formula as follows: Bi1 - xHoxFe1- yCryO3, wherein x is greater than 0 and is less than or equal to 0.15, and y is greater than 0 and is less than or equal to 0.1. The method comprises the following steps: carrying out the treatments of mixing and ball-milling on raw materials including Ho2O3, Bi2O3, Cr2O3 and Fe2O3 by weight to obtain a slurry material; calcining for 2 hours at the temperature of 750 to 830 DEG C after the slurry material is dried; carrying out the ball-milling treatment on the powder again; adding a polyvinyl alcohol aqueous solution to the powder after the powder is dried; pressing the mixture into a tablet shape by using a tablet press under the pressure of 100 to 150 MPa; extracting colloid from a tablet-shaped material for 4 hours at the temperature of 550 DEG C; and finally, sintering the tablet-shaped material into the ceramic at the temperature of 800 to 870 DEG C. The multiferroic ceramic provided by the invention has excellent ferroelectric and ferromagnetic properties at the room temperature.

Description

technical field [0001] The invention belongs to the field of electronic ceramic materials, and in particular relates to a bismuth and iron co-doped bismuth ferrite ceramic with excellent ferroelectricity and ferromagnetism at room temperature and a preparation process thereof. Background technique [0002] Multiferroic materials have more than two ferroelectric, ferromagnetic and ferroelastic properties at the same time, and their magnetoelectric effect has great potential application prospects in the development of new information storage devices, spintronic devices and magnetoelectric sensor devices. [0003] Bismuth ferrite (BiFeO 3 ) has attracted extensive attention from researchers due to its room-temperature multiferroic properties (ferroelectric Curie temperature of 380 °C and antiferromagnetic Neel point of 810 °C). However, the large leakage current inhibits the ferroelectric properties of bismuth ferrite; the intrinsic helical antiferromagnetic structure constrai...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622
Inventor 张铭谢群锋胡州严辉宋雪梅王波王如志侯育冬朱满康汪浩
Owner BEIJING UNIV OF TECH
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