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Rare earth oxide ceramic material with exchange bias reversal and preparation method of rare earth oxide ceramic material

A technology for rare earth oxides and ceramic materials, which is applied in the field of rare earth oxide ceramic materials and their preparation, can solve the problems of rare compounds and difficult practical application, and achieves a simple and easy preparation process, reduced energy consumption and fewer defects. Effect

Active Publication Date: 2018-06-05
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example in La 1-x PR x CrO 3 、Sr 2 wxya 6 , NdMnO 3 , YbFe 2 o 4 , TmCrO 3 The exchange bias effect has been found in compounds such as , but it is still rare to find compounds with positive exchange bias effect or exchange bias reversal
In 2016, L.Wang et al published a paper entitled "Reversals of magnetization and exchange-bias inperovskite chromite YbCrO 3 " article, reported the single-phase compound YbCrO 3 exchange bias reversal and magnetization reversal in YbCrO 3 The exchange bias inversion temperature and the exchange bias cut-off temperature are only 19K and 105K respectively, which is not easy for practical application

Method used

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  • Rare earth oxide ceramic material with exchange bias reversal and preparation method of rare earth oxide ceramic material
  • Rare earth oxide ceramic material with exchange bias reversal and preparation method of rare earth oxide ceramic material
  • Rare earth oxide ceramic material with exchange bias reversal and preparation method of rare earth oxide ceramic material

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Experimental program
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Effect test

Embodiment 1

[0030] Step 1: ytterbium trioxide (Yb 2 o 3 ), chromium trioxide (Cr 2 o 3 ) and ferric oxide (Fe 2 o 3 ) powder with a particle size of 10 microns is used as a raw material, which is mixed according to the ratio of Yb:Cr:Fe=50:45:5 (atomic percentage), and mixed uniformly.

[0031] Step 2: Press the uniformly mixed powder in step 1 into a cylindrical sheet with a diameter of 12mm and a thickness of 2-3mm by using a cold pressing die, and the applied pressure is 18Mpa.

[0032] Step 3: put the cylindrical piece molded in step 2 into a box-type resistance furnace for sintering, firstly raise it from room temperature (25°C) to 450°C at 5°C / min, and keep it warm at 450°C for 1 hour, that is, pre-fire; Then rise to 1100°C at 5°C / min, then rise to 1350°C at 2°C / min, and keep at 1350°C for 48 hours, that is, high-temperature solid-phase sintering; then cool down to 500°C at 5°C / min, Then cool down to room temperature naturally with the furnace.

[0033] Step 4: Put the molded...

Embodiment 2

[0040] Step 1: Hydrated ytterbium carbonate (Yb 2 (CO 3 ) 3 ·nH 2 O), hydrated chromium carbonate (Cr 2 (CO 3 ) 3 ·nH 2 O) and hydrated iron carbonate (Fe 2 (CO 3 ) 3 ·nH 2 O) The powder with a particle size of 6 microns is used as the raw material, and the ingredients are mixed according to the ratio of Yb:Cr:Fe=50:45:5 (atomic percentage), and mixed evenly.

[0041] Step 2: Press the uniformly mixed powder in step 1 into a cylindrical sheet with a diameter of 12mm and a thickness of 2-3mm by using a cold pressing die, and the applied pressure is 6Mpa.

[0042] Step 3: Put the cylindrical sheet molded in step 2 into a box-type resistance furnace for sintering. First, the temperature is raised from room temperature to 900°C at 5°C / min, and kept at 900°C for 3 hours, that is, pre-fired; / min to 1100°C, then raised to 1350°C at 2°C / min, and kept at 1350°C for 48 hours, that is, high-temperature solid phase sintering; then cooled to 500°C at 5°C / min, and then naturally...

Embodiment 3

[0046] Step 1: Hydrated ytterbium nitrate (Yb(NO 3 ) 3 ·nH 2 O), chromium nitrate hydrate (Cr(NO 3 ) 3 ·nH 2 O) and ferric nitrate hydrate (Fe(NO 3 ) 3 ·nH 2 O) The powder with a particle size of 3 microns is used as the raw material, and the ingredients are prepared according to the ratio of Yb:Cr:Fe=50:45:5 (atomic percentage), and mixed evenly.

[0047] Step 2, step 3, and step 4 are the same as in embodiment 1.

[0048] For the target product YbCr 0.9 Fe 0.1 o 3 The detailed characterization process of magnetic properties such as exchange bias reversal and magnetization reversal of the single-phase ceramic material is the same as that of Example 1.

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Abstract

The invention belongs to the field of rare earth magnetic functional materials and particularly relates to a rare earth oxide ceramic material with exchange bias reversal and a preparation method of the rare earth oxide ceramic material. The molecular formula of the rare earth oxide ceramic material is YbCr0.9Fe0.1O3. The preparation method of the rare earth oxide ceramic material comprises the following steps: uniformly mixing a powdery ytterbium source compound, a chromium source compound and an iron source compound according to the percentage of metal atoms; compacting the uniformly-mixed powder; carrying out pre-sintering and high temperature solid phase sintering on the obtained compact, and then cooling; detecting the single-phase property of the obtained product by X-ray diffraction, and carrying out sufficient solid-phase reaction to form a perovskite type Yb(Cr.Fe)O3 single phase, namely a target product YbCr0.9Fe0.1O3. According to the preparation method disclosed by the invention, the exchange bias reversal temperature and the exchange bias cut-off temperature are respectively improved to 31K and 130 K, the temperature range of the exchange bias effect is widened, and the exchange bias reversal temperature is increased, therefore, a new step is stepped for practical application.

Description

technical field [0001] The invention belongs to the field of rare earth magnetic functional materials, in particular to a rare earth oxide ceramic material with exchange bias reversal and a preparation method thereof. Background technique [0002] The exchange bias effect has attracted the attention of many scientists and technicians worldwide because of its important applications in the fields of magnetic recording, spin valve devices and sensors. The phenomenon of exchange bias was first discovered in 1956 by Meiklejohn and Bean in cobalt-cobalt oxide micropowders with core-shell structure. Exchange bias is generally defined as the phenomenon that the hysteresis loop shifts along the H-axis when the system is cooled from the Neel temperature higher than the antiferromagnetic material to a lower temperature in a static magnetic field. This phenomenon usually occurs in heterostructure systems with ferromagnetism and antiferromagnetism. For example, exchange bias is found in...

Claims

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Application Information

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IPC IPC(8): C04B35/50
CPCC04B35/50C04B2235/3241C04B2235/3272C04B2235/442C04B2235/443
Inventor 王磊张莉丽钟震晨钟明龙熊厚冬谭秋兰
Owner JIANGXI UNIV OF SCI & TECH
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