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Perovskite composite oxide LaFeO3 monodisperse micrometer hollow balls and preparation method thereof

A composite oxide and perovskite technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc.

Inactive Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, no literature and patents at home and abroad have reported highly monodisperse LaFeO 3 Simple, efficient, economical and green low-temperature hydrothermal preparation method of micron hollow spheres

Method used

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  • Perovskite composite oxide LaFeO3 monodisperse micrometer hollow balls and preparation method thereof
  • Perovskite composite oxide LaFeO3 monodisperse micrometer hollow balls and preparation method thereof
  • Perovskite composite oxide LaFeO3 monodisperse micrometer hollow balls and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Under stirring conditions, 0.01mol La(NO 3 ) 3 ·6H 2 O and 0.01molFe(NO 3 ) 3 9H 2 O was dissolved in 25mL deionized water, and 0.02mol citric acid and 0.03mol urea were added successively to form a uniform metal ion complex solution. in an autoclave and keep it warm at 110°C for 3 hours, then rise to 110°C for 4 hours after cooling to room temperature, cool to room temperature and filter, dry and grind the resulting product at room temperature, and finally place it in a muffle furnace in air Under the atmosphere, raise the temperature from room temperature to 400 °C at a rate of 3 °C / min and keep the temperature for 2 hours, continue to heat up to 650 °C and keep the temperature for 4 hours, and cool to room temperature to obtain LaFeO with better dispersion. 3 micron hollow spheres. The diameter of the microsphere is about 1.5-7 microns, and the wall thickness is about 300-500 nanometers.

Embodiment 2

[0014] Example 2: Under stirring conditions, 0.01mol La(NO 3 ) 3 ·6H 2 O and 0.01molFe(NO 3 ) 3 9H 2O was dissolved in 25mL deionized water, and 0.02mol citric acid and 0.03mol urea were added successively to form a uniform metal ion complex solution. in an autoclave and keep it warm at 110°C for 1 hour, then warm it up to 110°C for 5 hours after cooling to room temperature, cool to room temperature and filter, dry and grind the product at room temperature, and finally place it in a muffle furnace in air Under the atmosphere, raise the temperature from room temperature to 400 °C at a rate of 3 °C / min and keep the temperature for 2 hours, continue to heat up to 650 °C and keep the temperature for 4 hours, and cool to room temperature to obtain LaFeO with better dispersion. 3 micron hollow spheres. The diameter of the microsphere is about 2-6 microns, and the wall thickness is about 300-700 nanometers.

Embodiment 3

[0015] Example 3: Under stirring conditions, 0.01mol La(NO 3 ) 3 ·6H 2 O and 0.01molFe(NO 3 ) 3 9H 2 O was dissolved in 25mL deionized water, and 0.02mol citric acid and 0.03mol urea were added successively to form a uniform metal ion complex solution. In an autoclave and kept at 110°C for 5h, cooled to room temperature and filtered, the resulting product was dried and ground at room temperature, and finally placed in a muffle furnace in an air atmosphere at a rate of 3°C / min from room temperature to To 400°C and keep the temperature for 2h, continue to heat up to 650°C and keep the temperature for 4h, cool to room temperature, that is, well-dispersed LaFeO 3 micron hollow spheres. The diameter of the microsphere is about 2~7 microns, and the particle size is about 30~50nm.

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Abstract

The invention relates to perovskite composite oxide LaFeO3 monodisperse micrometer hollow balls and a preparation method thereof, and belongs to the technical field of micro nanometer functional materials. The micrometer hollow balls are in a monodisperse state, the outer diameter of each micrometer hollow ball is between 1 and 7 micrometers, and the micrometer hollow balls are in a perovskite crystalline phase. The preparation method comprises the following steps of: stirring a mixed solution containing urea serving as an additive, citric acid serving as a complexing agent, deionized water serving as a solvent and metal nitrate uniformly, transferring the mixed solution to an autogenous pressure kettle, putting into a constant temperature box, keeping temperature for a certain time, cooling naturally, performing suction filtration on the obtained products, drying, grinding, and roasting at high temperature to obtain the highly-monodispersed LaFeO3 micrometer hollow balls. According to the preparation method, a template is not needed to be utilized, the reaction time is short, the preparation process is environment-friendly, and the operation is easy to implement.

Description

technical field [0001] The invention relates to a perovskite composite oxide LaFeO 3 The invention relates to a low-temperature hydrothermal preparation method of monodisperse micron hollow spheres, urea-assisted, and citric acid complexed, and belongs to the technical field of micro-nano functional materials. Background technique [0002] Due to the perovskite composite oxide LaFeO 3 With excellent magnetoelectric properties, it is widely used in solid fuel cells, solid electrolytes, sensors and heterogeneous catalysis and other related fields. The preparation methods of its micro-nano particles are relatively mature, mainly including combustion method, solid-phase method, citric acid Complexation method, sol-gel method, hydrothermal method, template method, etc., but used to prepare LaFeO with special morphology 3 There are still relatively few methods for materials, and most of the reported ones are used to prepare LaFeO 3 Fibers, such as sol-gel method combined with e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 戴洪兴吉科猛邓积光王芳高宝族韩文
Owner BEIJING UNIV OF TECH
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