Method for making vanadium dioxide and its adulterant nanoceramics

A vanadium dioxide nanometer and vanadium dioxide technology are applied in the field of preparation of vanadium dioxide or its dopant nano-ceramics, which can solve the problems of high cost, impossible mass production and the like, achieve low investment and be favorable for commercialization , the effect of low energy consumption

Inactive Publication Date: 2005-01-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Decomposition of VOCl by Laser Induced Gas Phase Reaction 3 , although 2 Powder, but this method is obviously very expensive, and it is impossible to produce in large quantities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Preparation of VO 2 Nano powder:

[0018] 1) Preparation of VOCl 2 the solution

[0019] Weigh 91g V 2 o 5 , add 100 ~ 200mL distilled water to adjust slurry, add 38g H 2 C 2 o 4 2H 2 O, heat, add 140~160mL concentrated hydrochloric acid in portions under stirring, boil slightly for a few minutes, then add N 2 h 4 ·H 2 O turns the solution dark blue. or in the above V 2 o 5 In the suspension, add 120-140mL concentrated hydrochloric acid and 26-29g N 2 h 4 2HCl, dissolved to obtain a blue solution. with a small amount of V 2 o 5 or N 2 h 4 2HCl(N 2 h 4 ·H 2 O) 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. VO 2 + and V 3+ The detection of ferrous o-phenanthroline and potassium dichromate method.

[0020] 2) Preparation of precursor

[0021] Weigh 14~16g NH 4 HCO 3 , or 8.5 ~ 10g (NH 4 ) 2 CO 3, add 40 ~ 60mL distilled water, pass through CO 2 ...

Embodiment 2

[0029] When preparing Cr-doped materials, at V 1-x Cr x o 2 The value of x in (02 The variation of the Cr / V molar ratio in the solution was adjusted, and the deviation of repeated experiments for the same value of x was 2 Add CrCl to the solution 3 , so that the Cr / V molar ratio is 0.065, then the same method as in Example 1 is used to synthesize the Cr-doped precursor, powder and sintered into ceramics. Obtain the composition of powder and ceramics as V 0.955 Cr 0.045 o 2 , phase transition temperature 74°C, R 室温 / R 高温 for 500.

Embodiment 3

[0031] When preparing Mo-doped material, V 1-x Mo x o 2 The value of x in (02 h 2 2HCl will (NH 4 ) 2 MoO 4 reduction. This reduced product is added to VOCl 2 In the solution, the Mo / V molar ratio was 0.11. Then synthesize the Mo-doped precursor in the same way as in Example 1, but the NH 4 HCO 3 The dosage increased to 19 ~ 22g. Prepare powder and ceramics in the same way to obtain V 0.985 Mo 0.015 o 2 Dopant, phase transition temperature 51°C, R 室温 / R 高温 for 240.

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Abstract

A nano-ceramics is prepared from V2O5 through reducing to obtain VOCl2 solution, preparing ammonium subcarbonate precursor, pyrodecomposing to obtain VO2 nanoparticles, die pressing and sintering to obtain VO2 nano ceramics. Its advantages are high strength, good thermoelectric performance, and low cost.

Description

technical field [0001] The invention relates to a preparation method of vanadium dioxide or its dopant nano ceramics. Background technique [0002] As we all know, VO 2 There is a low temperature monoclinic (semiconductor phase) to high temperature tetragonal (metallic phase) transition at about 68°C. During the phase transition, some physical properties such as electrical conductivity, magnetic moment and infrared transmittance jump; especially for VO 2 When doping, the phase transition temperature (T C ) can be adjusted and changed, and the amount of change is related to the type and quantity of doped impurities. For example, doping Cr increases Tc, V 0.976 Cr 0.024 o 2 the T C It is 72°C. For every 1% of Mo atoms added, Tc decreases by 11°C, and for every 1% of W atoms added, Tc decreases by 26°C. VO 2 These special properties can be used in non-contact thermoelectric switches, thermal relays, temperature detectors and temperature c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 郑臣谋张介立
Owner SUN YAT SEN UNIV
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