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Perovskite-structure manganese oxide-based colossal magnetoresistance material and preparation method thereof

A technology of perovskite structure and giant magnetoresistance is applied in the field of magnetic functional materials to achieve the effects of simple process, high magnetoresistance and easy realization.

Active Publication Date: 2017-02-22
长沙赢睿知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although people have done a lot of research on the ultra-giant magnetoresistance effect and its related physical phenomena, and achieved a lot of results, this field still faces many new topics and challenges.
At present, ultra-giant magnetoresistance materials usually have a large dependence on temperature, which fundamentally limits the practical application of magnetic functional devices based on manganese oxides.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step (1). 3g (0.03 moles) of alkaline earth metal oxide CaCO 3 , 8.7g (0.1 mol) manganese dioxide and 11.4g (0.035 mol) rare earth metal oxide La 2 o 3 Evenly mixed into raw materials;

[0021] Step (2). The mixed raw materials are fully ground in an agate mortar and stored in an alumina ceramic container.

[0022] Step (3). Place the ceramic container storing the raw materials in a high-temperature sintering furnace, raise the temperature to 950°C at a rate of 3°C / min and keep it warm for 12 hours, then continue to heat up to 1100°C at a rate of 6°C / min and keep it warm for 12 hours ;

[0023] Step (4). The ceramic container is naturally cooled to room temperature, and the product in the ceramic container is taken out, and pressed into tablets at room temperature and a pressure of 15 MPa;

[0024] Step (5). High temperature annealing at 1100° C. for 24 hours, and then naturally cooling to room temperature to obtain La 0.7 Ca 0.3 MnO 3 finished product.

[0025]...

Embodiment 2

[0027] Step (1). 4.43g (0.03 moles) of alkaline earth metal oxide SrCO 3 , 8.7g (0.1 mol) manganese dioxide and 11.40g (0.035 mol) rare earth metal oxide La 2 o 3 Evenly mixed into raw materials;

[0028] Step (2). The mixed raw materials are fully ground in an agate mortar and stored in an alumina ceramic container.

[0029] Step (3). Place the ceramic container storing raw materials in a high-temperature sintering furnace, raise the temperature to 950°C at a rate of 4°C / min, and then keep it warm for 10 hours, then continue to heat it up to 1150°C at a rate of 8°C / min, and then keep it warm for 10 hours ;

[0030] Step (4). The ceramic container is naturally cooled to room temperature, and the product in the ceramic container is taken out, and pressed into tablets at room temperature and a pressure of 15 MPa;

[0031] Step (5). High temperature annealing at 1150° C. for 24 hours, and then naturally cooling to room temperature to obtain La 0.7 Sr 0.3 MnO 3 finished pro...

Embodiment 3

[0034] Step (1). 3g (0.03 moles) of alkaline earth metal oxide CaCO 3 , 8.7g (0.1 mol) manganese dioxide and 12.26g (0.012 mol) rare earth metal oxide Pr 6 o 11 Evenly mixed into raw materials;

[0035] Step (2). The mixed raw materials are fully ground in an agate mortar and stored in an alumina ceramic container.

[0036]Step (3). Place the ceramic container storing the raw materials in a high-temperature sintering furnace, raise the temperature to 900°C at a rate of 3°C / min and keep it warm for 15 hours, then continue to heat up to 1100°C at a rate of 6°C / min and keep it warm for 15 hours ;

[0037] Step (4). The ceramic container is naturally cooled to room temperature, and the product in the ceramic container is taken out, and pressed into tablets at room temperature and a pressure of 18Mpa;

[0038] Step (5). High temperature annealing at 1100° C. for 30 hours, then naturally cooling to room temperature to obtain Pr 0.7 Ca 0.3 MnO 3 finished product.

[0039] Obt...

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Abstract

The invention discloses a perovskite-structure manganese oxide-based colossal magnetoresistance material. The general chemical formula of the colossal magnetoresistance material is (PrCLaDSrECaF)MnO3, wherein Mn is manganese metal, O is oxygen, C+D=0.7, E+F=0.3, and the colossal magnetoresistance material is of a ABO3 type perovskite crystal structure. The invention further discloses a preparation method of the perovskite-structure manganese oxide-based colossal magnetoresistance material. The control method of the perovskite-structure manganese oxide-based colossal magnetoresistance material is simple in technology and easy to achieve. The prepared magnetic material is significant in resistance variation under an additional magnetic field, magnetoresistance is high, metal-insulator transformation temperature and maximum magnetoresistance can be continuously adjusted along with the composition change within the temperature range of 200 K to 300 K, and the colossal magnetoresistance material has a good electromagnetic property.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, and in particular relates to a perovskite-structured manganese oxide-based ultra-giant magnetoresistance material and a preparation method thereof. Background technique [0002] The research history of perovskite manganese oxides can be traced back to the early 1950s, and their general chemical formula is R 1-x T x MnO 3 . Usually, R is a trivalent rare-earth metal element such as La, Pr, and Nd, and T is a divalent alkaline-earth metal element such as Sr, Ca, and Ba. In 1950, Joker and VanSanten pointed out that manganese oxides are different from general ferromagnets. When doped, the manganese oxide will undergo a paramagnetic-ferromagnetic phase transition at the Curie temperature, and at the same time the conductivity will change significantly. This insulating phase-metal ferromagnetic phase transition is the most significant feature of manganese oxides. . After that, in 199...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50
CPCC04B35/50C04B2235/3267C04B2235/442C04B2235/96
Inventor 王海欧霍德璇苏昆朋黄帅王昕
Owner 长沙赢睿知识产权运营有限公司
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