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Method for preparing single-phase BiFeO3 ceramics through hardening process

A ceramic and single-phase technology, applied in the field of preparing single-phase BiFeO3 ceramics, can solve the problems of small remanent polarization value and no saturated hysteresis loop, and achieve the effect of simple method, low cost and reliable method

Inactive Publication Date: 2005-10-26
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, these two methods have great limitations, and the prepared BiFeO 3 Ceramics do not have a saturated hysteresis loop, and the corresponding remanent polarization values ​​are relatively small, respectively 0.02 and 4.0μC / cm 2

Method used

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  • Method for preparing single-phase BiFeO3 ceramics through hardening process
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  • Method for preparing single-phase BiFeO3 ceramics through hardening process

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Embodiment Construction

[0018] Step 1: First weigh the dried Bi with a purity equal to 99.0% 2 o 3 and Fe 2 o 3 powder (the molar ratio is 1:1), alcohol is added to the mixture of the two powders, and then ball milling (320 rpm, 8 hours) is used to mix the two powders evenly.

[0019] The second step: after drying the powder obtained in the first step, add an appropriate amount of binder (polyhexenol), and then grind it with a mortar to make it uniform.

[0020] Step 3: Use a pressure of 10-15MPa to press an appropriate amount of powder into a thin sheet with a diameter of about 15-30 mm and a thickness of about 1-4 mm.

[0021] Step 4: Put appropriate amount of corresponding powder into Al 2 o 3 Crucible, then put the slice into it, and cover the slice with the corresponding powder, and finally use another crucible to buckle upside down on the first crucible, so that the slice is in a sealed state.

[0022] Step 5: Put the crucible sealed with the sheet into the muffle furnace, and control the...

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Abstract

The present invention relates to a method for preparing single-phase BiFeO3 ceramic by utilizing quenching process. It is characterized by quickly cooling sintered BiFeO3 ceramic. Said method includes the following steps: weighing Bi2O3 powder and Fe2O3 powder according to the mole ratio of 1:1, ball-grinding for 4-12 hr according to 100-500 rpm, uniformly mixing two powdes, drying the above-mentioned mixed powder, pressing the mixed powder into thin sheet, then placing proper quantity of the above-mentioned mixed powder into Al2O3 crucible, placing the thin sheet into the crucible, and using correspondent powder to cover the thin shet to make the thin sheet and powder be in sealed state, then placing the above-mentioned crucible into heating furnace, heating to sintering temperature, heating speed is 2-8 deg.C / min, sintering temperature is 830-920 deg.C and sintering time is 30-60 min., after sintering process is completed, promptly quenching so as to obtain the invented product.

Description

1. Technical field [0001] The invention relates to a method for preparing single-phase BiFeO by a quenching method 3 ceramic approach, that is, the sintered BiFeO 3 Ceramics are subjected to rapid cooling treatment to prepare single-phase, insulating, BiFeO with good ferroelectric properties and antiferromagnetic properties 3 ceramics. 2. Background technology [0002] Multifunctional electronic materials have various excellent properties such as (anti)ferroelectricity, (anti)ferromagnetism, and piezoelectricity at the same time. This type of material perfectly integrates the fields of electricity and magnetism, that is, the magnetic properties of the material can be controlled by the electric field or the electrical polarization of the material can be controlled by the magnetic field, so that this type of material can be used in new, highly integrated electronic devices such as non-volatile memory, magnetic It has important application prospects in devices such as contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26
Inventor 张善涛卢明辉陈延峰闵乃本
Owner NANJING UNIV
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