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Method for preparing nano lanthanum-strontium-manganese oxide

A lanthanum strontium manganese and oxide technology is applied in the field of preparation of nanometer oxides, which can solve the problems of increasing impurity content, harmful to human health, complicated production process, etc., and achieves the effects of good uniformity, little environmental pollution, and low heat treatment temperature.

Inactive Publication Date: 2008-07-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process is complicated; metal alkoxides are used as raw materials, the cost is high, and alkoxides are highly toxic, harmful to human health, and easy to cause environmental pollution; Not easy to remove, thus increasing the content of impurities in the prepared powder

Method used

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  • Method for preparing nano lanthanum-strontium-manganese oxide
  • Method for preparing nano lanthanum-strontium-manganese oxide
  • Method for preparing nano lanthanum-strontium-manganese oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The concrete preparation method of this example is:

[0036] A. Select La at a molar ratio of 0.425:0.15:1 2 o 3 , Sr(NO 3 ) 2 and Mn(NO 3 ) 2 ; Selected La 2 o 3 Soluble in 33% dilute HNO 3 Medium, and HNO 3 with La 2 o 3 The molar ratio is 2:1; the solution is obtained, and after the solution is clarified, Sr(NO 3 ) 2 , Mn(NO 3 ) 2Add to the solution and stir, and at the same time add polyethylene glycol, polyethylene glycol and dilute HNO 3 The molar ratio is 1:2. Obtain the precursor solution;

[0037] B. NH will be used as a precipitant 4 OH solution is introduced into the titration vessel, NH 4 OH and La 3+ 、Sr 2+ , Mn 2+ The molar ratio of the sum of the moles of metal ions is 1.05:1; then the NH in the titration container 4 Add the OH solution drop by drop to the precursor solution in step A, and the drop speed is controlled at 0.05cm 3 / min, and stir at the same time, the stirring speed is 800r / min, after the drop, precipitate for 4 hours...

Embodiment 2

[0042] This example is substantially the same as Example One, and the difference is the following process parameters in the A step: La 2 o 3 , Sr(NO 3 ) 2 and Mn(NO 3 ) molar ratio of 0.33:0.33:1; dilute HNO 3 Concentration of 34% polyethylene glycol with dilute HNO 3 The molar ratio is 1:3.

[0043] The product obtained in this example is La 0.67 Sr 0.33 MnO 3 Single-phase polycrystalline powder. Figure 2a is the nanometer La obtained by the method of this example 0.67 Sr 0.33 MnO 3 X-ray diffraction pattern of the powder. As can be seen from Fig. 2a, the particle diameter of the product that this example makes is about 25nm; Fig. 2b is the nanometer La that is made by the method of this example 0.67 Sr 0.33 MnO 3 SEM photo of the powder. It can be seen from Figure 2b that the product obtained by the method of this example has uniform particle size, compact structure and high purity.

Embodiment 3

[0045] This example is substantially the same as Example One, and the difference is only the following process parameters in the A step: La 2 o 3 , Sr(NO 3 ) 2 and Mn(NO 3 ) molar ratio of 0.25:0.5:1; dilute HNO 3 The concentration is 32%.

[0046] The product obtained in this example is a single-phase La 0.5 Sr 0.5 MnO 3 Polycrystalline powder. Figure 3a is the nanometer La obtained by the method of this example 0.5 Sr 0.5 MnO 3 X-ray diffraction pattern of the powder. As can be seen from Fig. 3a, the particle diameter of the product that this example makes is about 30nm; Fig. 3b is the nanometer La that is made by the method of this example 0.5 Sr 0.5 MnO 3 SEM photo of the powder. It can be seen from Figure 3b that the product obtained by the method of this example has uniform particle size, compact structure and high purity.

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Abstract

The invention provides a method for preparing nanometer lanthanum strontium manganese oxide (La1-xSrxMnO3) powder, which dissolves lanthana, strontium nitrate and manganous nitrate which are taken as raw materials into a nitric acid solution, then adopts ammonia water as a precipitant to carry out precipitation reaction at room temperature: the precipitate is heat-treated at the temperature of 600-700 DEG C to obtain nanometer perovskite structure lanthanum strontium manganese oxide (La1-xSrxMnO3) polycrystalline powder. The lanthanum strontium manganese oxide oxide powder with different grain sizes (20-35nm) can be obtained by changing the temperature and time of the heat treatment. The method has the advantages that the reaction is moderate, the grain diameter of the oxide powder is uniform, the structure is compact and the performance is stable; the preparation technique is simple, the production cost is low and the invention is suitable for industrial production and so on.

Description

technical field [0001] The invention relates to a method for preparing an oxide, in particular to a method for preparing a nano-oxide with a titanium ore structure. Background technique [0002] Nano-lanthanum strontium manganese oxide (La 1-x Sr x MnO 3 ) materials are a class of functional materials with a wide range of uses. This material has a crystal phase structure of perovskite and is now mainly used as a magnetoresistance. Due to the great application prospects of magnetoresistive materials, they have been made into magnetic heads in information storage systems, magnetoresistive memories, automotive sensors, and various general-purpose magnets for measuring and controlling position, angle, speed, speed, and current. Resistance effect devices. Another application is the application of magnetic refrigeration. This kind of material can be used as a high-temperature, especially room-temperature magnetic refrigeration material in medical and health care, aerospace, au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00C04B35/36
Inventor 何伟羊新胜阚香张元发杨立芹赵勇
Owner SOUTHWEST JIAOTONG UNIV
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