Method for preparing perovskite type LaFe0.5Mn0.5O3 by geoceric acid solution combustion method

A perovskite type, solution combustion technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., can solve the problems of large product particle size, easy hydrolysis of reactant metal ions, etc., and achieve small particle size distribution, easy The effect of industrialization and uniform particle size distribution

Inactive Publication Date: 2009-04-22
ZHONGBEI UNIV
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  • Summary
  • Abstract
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Problems solved by technology

Since the gel is formed in an aqueous solution system, it is inevitable that the metal ion of the reactant is easily hydrolyzed, and the resulting product has a large particle size.

Method used

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  • Method for preparing perovskite type LaFe0.5Mn0.5O3 by geoceric acid solution combustion method
  • Method for preparing perovskite type LaFe0.5Mn0.5O3 by geoceric acid solution combustion method
  • Method for preparing perovskite type LaFe0.5Mn0.5O3 by geoceric acid solution combustion method

Examples

Experimental program
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Effect test

Embodiment approach 1

[0022] Weigh a certain amount of lanthanum nitrate, ferric nitrate, manganese chloride, and stearic acid respectively so that the molar ratio is 1:0.5:0.5:8. First, under the condition of constant temperature oil bath heating, dissolve stearic acid, under constant temperature magnetic stirring, dissolve lanthanum nitrate, ferric nitrate and manganese chloride solids in molten stearic acid, control the temperature at 115°C, and react for enough time to make it Become a stearic acid complex solution. Make it burn at 500°C, take out the burnt product, grind it and put it in a muffle furnace, and calcinate it at 600°C for 1 hour to get the following: figure 1 with figure 2 Nano-LaFe shown 0.5 mn 0.5 o 3 Powder, the shape of the powder is approximately spherical, and it is a nano-aggregate with a size of about 20nm-50nm.

Embodiment approach 2

[0024] Weigh a certain amount of lanthanum nitrate, ferric nitrate, manganese chloride and stearic acid respectively so that the molar ratio is 1:0.5:0.5:7. First, under the condition of constant temperature oil bath heating, stearic acid is dissolved, and under constant temperature magnetic stirring, lanthanum nitrate, ferric nitrate, and manganese chloride solid are dissolved in molten stearic acid, and the temperature is controlled at 113°C, and the reaction time is sufficient to form Stearic acid complex solution, burn it at 450°C, take out the product and grind it, put it in a muffle furnace, and calcinate it at 700°C for 1 hour to obtain nano-LaFe 0.5 mn 0.5 o3 Powder. See the attached XRD diffraction pattern of the powder image 3 .

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Abstract

The invention provides a method for preparing superfine perovskite type LaFe0.5Mn0.5O3 by a stearic acid solution combustion method. The method comprises the following proposal: respectively weighing lanthanum nitrate, ferric nitrate, manganese chloride and the stearic acid according to mol ratio of 1 to 0.5 to 0.5 to 7-10; dissolving the lanthanum nitrate, the ferric nitrate and the manganese chloride solids in the melted stearic acid at a temperature of between 110 and 117 DEG C to form stearic acid complex solution with enough reaction time; placing the solution in a muffle at a temperature of between 300 and 500 DEG C, and combusting the solution to obtain mixed oxide; and obtaining nanometer LaFe0.5Mn0.5O3 powder after calcining the mixture in the muffle at 600 DEG C for 1 hour. The crystallization degree of the obtained powder can be higher if the calcination temperature is higher.

Description

technical field [0001] The invention belongs to perovskite type nano LaFe 0.5 mn 0.5 o 3 The field of preparation technology, specifically the preparation of perovskite-type nano-LaFe by stearic acid solution combustion method 0.5 mn 0.5 o 3 . Background technique [0002] In recent years, nanoscience and nanotechnology are booming. Nanomaterials have broad application prospects in the fields of magnetism, electronics, optics, high-density sintering, photocatalysis, sensing, especially biology and medicine. [0003] LaFe 0.5 mn 0.5 o 3 It is a perovskite type rare earth composite oxide, and it is widely studied by scientific and technological workers as a three-way catalyst for automobile exhaust. It is well known that synthesis methods often greatly affect and change the physical and chemical properties of substances. Preparation of LaFe 0.5 mn 0.5 o 3 There are few methods, and only two methods, sol-gel method and pulsed laser deposition, are reported. The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01G49/02C01F17/00
Inventor 卫芝贤王艳李延斌郭志彪
Owner ZHONGBEI UNIV
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