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V2O3 and its blended nano powder and its preparing method

A nano-powder and powder technology, which is applied in the field of V2O3 and its dopant nano-powder and its preparation, can solve the problems of difficult commercialization of materials, unfavorable mass production, no preparation method, etc., and achieves low equipment requirements and investment. Small, environmentally friendly effect of craftsmanship

Inactive Publication Date: 2004-04-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the disadvantages of high equipment requirements, high energy consumption, difficult operation control, high powder cost, and unfavorable mass production.
Therefore, there is no economical and practical preparation method for this type of powder, which makes it difficult to commercialize the material

Method used

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  • V2O3 and its blended nano powder and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] V 2 o 3 Powder preparation

[0022] 1) Weigh 91gV 2 o 5 , add a small amount of distilled water to adjust the slurry, add 38gH 2 C 2 o 4 2H 2 O, heat, add 140~160ml concentrated hydrochloric acid in batches under stirring, boil slightly for 3~6 minutes, then add N 2 h 4 ·H 2 O makes the solution turn dark blue, and the reduction produces VOCl 2 solution. with a small amount of V 2 o 5 or N 2 h 4 2HCl adjusted to the solution can not detect VO 2 + and V 3+ ion. If necessary, filter to remove insoluble matter, and then dilute to 500ml;

[0023]2) Weigh 28-32g NH 4 HCO 3 or 17~20g(NH 4 ) 2 CO 3 , add a small amount of distilled water, pass CO 2 gas. Then add 56 ~ 60ml of the above VOCl under stirring z solution. Let it stand for 0.5-2 hours, or it can be placed overnight under the isolation of air. Suction filtration, with saturated NH 4 HCO 3 The solution was washed to be free of Cl - , and then washed with a small amount of ethanol to obta...

Embodiment 2

[0027] Doped with Cr 3+ Powder preparation:

[0028] In the preparation of doped Cr 3+ When the substance contains Cr 3+ salts, such as CrCl 3 and Cr 2 (SO 4 ) 3 etc. can be used as a source of dopant ions, they can be added to VOCl 2 solution, can also be added in NH 4 HCO 3 or (NH 4 ) 2 CO 3 in solution. at (V 1-x Cr x ) 2 o 3 The value of x in (0≤x≤0.04) can be adjusted by changing the molar ratio of Cr and V in the doping system, and the deviation of repeated experiments for the same value of x is 2 Add Cr to the solution 2 (SO 4 ) 3 , and then use the same method as in Example 1 to synthesize a Cr-doped precursor. Reduction of the thermally decomposed precursor in H2 gas stream, the nanopowder body composition that obtains is (V 0.988 Cr 0.012 ) 2 o 3 .

Embodiment 3

[0030] Doped with Al 3+ Powder preparation:

[0031] In the preparation of Al-doped 3+ substance, containing Al 3+ salts such as AlCl 3 and Al 2 (SO 4 ) 3 etc., can be used as a source of dopant ions. They can be added in VOCl 2 solution, can also be added in (NH 4 ) 2 CO 3 or (NH 4 )HCO 3 in solution. at (V 1-x Al x ) 2 o 3 The value of x in (0≤x≤0.03) can be determined by doping Al 3+ The variation of the molar ratio of Al and V in the system is adjusted, and the deviation of repeated experiments with the same value of x is 4 )HCO 3 AlCl was added to the solution 3 , and then use the same method as in Example 1 to synthesize the aluminum-doped precursor, and in H 2 Reductive thermal decomposition in the air stream, the composition of the obtained nano-powder is (V 0.091 Al 0.009 ) 2 o 3 .

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Abstract

The present invention relates to one kind of spherical or quasi-spherical nano powder of V2O3 and its adulterant. The size is below 100 nm. It is prepared through the processes of reducing V2O3 to prepare VOCl2 solution, synthesizing basic vanadyl ammonium carbonate and its adulterant precursor, reducing and pyrolysing the precursor in H2 flow and at relatively lower temperature to obtain spherical or quasi-spherical 100 nm below powder of V2O3 and (V1-xMx)2O3 with M=Cr or Al and x being lower than 0.4. The preparation process is simple, low in power consumption, low in cost and no environmental pollution.

Description

technical field [0001] The present invention is about V 2 o 3 Its dopant nanopowder and its preparation method. Background technique [0002] V 2 o 3 At -120°C, it shows a negative temperature coefficient (NTC) first-order phase transition, and the resistivity jumps by 10 7-8 . When doped with a small amount of impurity Cr 3+ or Al 3+ At -80 ~ 200 ° C, it exhibits a positive temperature coefficient (PTC) characteristic, and the resistivity jumps by about 10 3 , the magnetic susceptibility also has a similar jump. V 2 o 3 These excellent properties of base materials can be used in many fields such as non-contact thermoelectric switches, thermal relays, temperature detectors and compensators, magnetic switches, various sensors and conversion elements. At the same time, V 2 o 3 Powder in conductive polymer composite materials, organic compound hydrogenation synthesis catalyst, O removal 2 There are also important applications in pharmaceuticals and other fields. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 郑臣谋雷德铭
Owner SUN YAT SEN UNIV
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