SrTaO2N oxynitride nano powder and preparation method thereof

A technology of oxynitride and nanopowder, which is applied in the direction of nitrogen and non-metallic compounds, nanotechnology, nanotechnology, etc., can solve the problems of high cost, slow gas-solid reaction diffusion, shortening nitriding time, etc., and achieve the effect of inhibiting urea Decomposition, shortening the reaction time, improving the effect of product purity

Active Publication Date: 2019-06-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above method does not directly use ammonia in the whole process, and avoids the slow diffusion of gas-solid reaction, which greatly shortens the nitriding time and improves the safety compared with the solid-phase synthesis method; but the disadvantage is that the process involves the key raw material Ta 3 N 5 Synthesis with TaON, easy to introduce by-products and high cost

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  • SrTaO2N oxynitride nano powder and preparation method thereof
  • SrTaO2N oxynitride nano powder and preparation method thereof
  • SrTaO2N oxynitride nano powder and preparation method thereof

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preparation example Construction

[0037] A kind of SrTaO of the present invention 2 The preparation method of N oxynitride nanopowder comprises the following steps:

[0038] S1. Dissolving alkaline earth metal salt, tantalum salt and nitrogen source I in alcohol, ball milling and drying to obtain a mixed precursor;

[0039] S2. Place the mixed precursor obtained in step S1 and nitrogen source II in a reaction vessel, and calcinate in a protective atmosphere to obtain SrTaO 2 N oxynitride nanopowder; wherein, the mixed precursor and the nitrogen source II are arranged at intervals.

[0040] The present invention SrTaO 2 The preparation method of N oxynitride nanopowder, when calcining, the mixed precursor and the organic nitrogen source II are arranged at intervals, and there are two distribution forms of the nitrogen source: one is the nitrogen source I mixed in the mixed precursor, and the other is Nitrogen source II, when the temperature rises, the nitrogen source II can decompose to produce ammonia gas. ...

Embodiment 1

[0042] A kind of SrTaO of this embodiment 2 The preparation method of N oxynitride nanopowder comprises the following steps:

[0043] S1. Add 3.5g of strontium carbonate, 4.5g of tantalum pentoxide and 2.4g of urea into 20ml of absolute ethanol, and ball mill for 240min to obtain a mixed slurry;

[0044] S2. Drying the mixed slurry obtained after ball milling in step S1. The drying process is as follows: heat preservation at 60° C. for 24 hours to obtain a mixed precursor;

[0045] S3. Place the mixed precursor and urea obtained in step S2 in a reaction container and place them at intervals, including 5 g of urea; then calcinate in a nitrogen atmosphere, the heating rate is 100°C / min, the temperature is 1100°C, and the holding time is 60min; Cool the furnace to room temperature to get SrTaO 2 N oxynitride nano powder, its phase composition and microscopic appearance are as follows figure 2 with image 3 shown.

[0046] Such as figure 1 As shown, the reaction container o...

Embodiment 2

[0062] A kind of SrTaO of this embodiment 2 The preparation method of N oxynitride nanopowder comprises the following steps:

[0063] S1. Add 3.5g of strontium carbonate, 4.5g of tantalum pentoxide and 2g of urea into 20ml of absolute ethanol, and ball mill for 240min to obtain a mixed slurry;

[0064] S2. Drying the mixed slurry obtained after ball milling in step S1. The drying process is as follows: heat preservation at 60° C. for 24 hours to obtain a mixed precursor;

[0065] S3. Place the mixed precursor and urea obtained in step S2 in a reaction container and place them at intervals, in which 4 g of urea is placed; then calcined in a nitrogen atmosphere with a heating rate of 100°C / min, a temperature of 1100°C, and a holding time of 30 minutes; finally Cool to room temperature with the furnace to get SrTaO 2 N oxynitride nanopowder.

[0066] The reaction vessel used in this embodiment is the same as in Example 1.

[0067] The SrTaO prepared in this example 2 The pha...

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Abstract

The invention discloses a preparation method of SrTaO2N oxynitride nanopowder, the preparation method comprises the following steps: S1, dissolving an alkaline earth metal salt, a tantalum salt and anitrogen source I in an alcohol, and drying after ball milling to obtain a mixed precursor; and S2, putting the mixed precursor obtained in the step S1 and a nitrogen source II in a reaction vessel and calcining in a protective atmosphere to obtain the SrTaO2N oxynitride nanopowder; the mixed precursor is spaced apart from the nitrogen source II. The product prepared by the preparation method hashigh purity and good dielectric properties.

Description

technical field [0001] The invention relates to the technical field of preparation of high-performance dielectric ceramic materials, in particular to a SrTaO 2 N-oxynitride nanopowder and its preparation method. Background technique [0002] The rapid development of the electronic ceramic industry puts forward an urgent demand for large-capacity, high-dielectric ceramic capacitors. Barium titanate is an important ceramic dielectric material, which has strong heat resistance, stable dielectric properties, and high dielectric constant (the relative dielectric constant can reach 2000~10000 or even higher near the Curie temperature), and is widely used It can be used as a microcapacitor and temperature compensation element with small volume and large capacity. However, pure barium titanate has a relatively low dielectric constant at room temperature and poor corrosion resistance to strong acids. Perovskite Oxynitride SrTaO 2 N is a new type of functional ceramic material com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626C01B21/082B82Y30/00
Inventor 李端李斌曾良高世涛杨雪金侯寓博
Owner NAT UNIV OF DEFENSE TECH
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