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Method for synthesizing Y2O3 nano material directly from combustion method of citric acid

A nanomaterial, citric acid technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., can solve the problems of powder reproducibility, cost and reliability, difficulty and complexity

Inactive Publication Date: 2006-11-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-synthetic powders can be obtained at low temperatures, but there are also many problems: many dissolution processes can only be used in a small range; expensive raw materials (sol-gel effects of metal alkoxides, freeze-dried refrigerants) are a strict Limitation; hydrolysis of metal organics, co-precipitation, hydrothermal synthesis, and other advanced technologies have complicated processes; from a technical point of view, there are also difficulties in powder reproducibility, cost and reliability

Method used

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  • Method for synthesizing Y2O3 nano material directly from combustion method of citric acid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1 Y 2 o 3 (C / N=0.5) specific process flow.

[0017] Weigh 57.44g Y(NO 3 ) 3 ·6H2O is used as raw material, dissolved in water to obtain its nitrate solution. Add 15.76g of citric acid complexing agent after thorough mixing. The solution was heated and evaporated in a water bath, the temperature was controlled at 80° C., and a transparent colloid was formed by continuous stirring for 5 hours. This sol is then further heated to form a gel. The desired material can be obtained after the gel is burned in air at 200°C.

example 2

[0018] Example 2 Y 2 o 3 (C / N=0.3) specific process flow.

[0019] Add 9.46g of citric acid complexing agent. Other technological process is with example 1.

example 3

[0020] Example 3 Y 2 o 3 (C / N=0.7) specific process flow.

[0021] Add 22.06g of citric acid complexing agent. Other technological process is with example 1.

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Abstract

A kind of citric acid combustion method directly synthesizes Y 2 o 3 The method for nanomaterials comprises the following specific steps: (1) Y(NO 3 ) 3 ・6H 2 O dissolved in water, or Y 2 o 3 As raw material, dissolve in nitric acid to form yttrium nitrate solution, mix well and add citric acid complexing agent, the molar ratio of citric acid to yttrium nitrate is (0.3-0.7); (2) heat the solution in a water bath Evaporate, control the temperature at 80°C, stir continuously for 5 hours to form a transparent sol, and then further heat the sol to form a gel; (3) After burning the gel at 200°C, the desired material is obtained.

Description

technical field [0001] The invention relates to nano-rare earth materials, in particular to direct synthesis of Y by a citric acid combustion method 2 o 3 methods for nanomaterials. Well-crystallized nanocrystals can be obtained directly by the combustion method, which avoids the high-temperature annealing treatment in the usual synthesis process. technical background [0002] Rare earth oxides are widely used in functional materials. For example: oxides of neodymium, europium, and yttrium are used in luminescent materials, permanent magnet materials, and superconducting materials. Glasses containing lanthanum oxide have high refractive index and are used in optical instruments. Yttrium oxide can be used to manufacture high-temperature and strong heat-resistant materials. alloy. Nanomaterials usually have characteristics such as specific surface effect, small size effect, interface effect, transparency effect, tunnel effect and macroscopic quantum effect, which lead to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C04B35/50
Inventor 夏国栋周圣明徐军张俊计
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI