Method for amino acid-assisted wet chemical synthesis of niobate hydrate powder material and obtained material

A powder material, niobate technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problem of high price, save production cost, overcome high cost, easy to mass production and industrial scale. Effect

Active Publication Date: 2020-12-18
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium dodecylbenzenesulfonate is not a very ideal crystal modifier. On the one hand, its price is relatively high;

Method used

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  • Method for amino acid-assisted wet chemical synthesis of niobate hydrate powder material and obtained material
  • Method for amino acid-assisted wet chemical synthesis of niobate hydrate powder material and obtained material
  • Method for amino acid-assisted wet chemical synthesis of niobate hydrate powder material and obtained material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The KOH solid was dissolved in deionized water to prepare a KOH aqueous solution with a concentration of 8 mol / L, and cooled naturally to room temperature. Take 100mL of KOH aqueous solution and transfer it to a 500mL beaker, add 75g of Nb 2 o 5 , and the resulting suspension was magnetically stirred for 30 min. Dissolve 2.7 g of glycine (Gly) in a small amount of deionized water, add it into the suspension, and continue magnetic stirring for 30 min.

[0058] Then, the beaker was placed on a heating and stirring platform, and the reaction was stirred at 60° C. for 48 hours. After the reaction, let the reaction solution stand for a period of time, and the reaction solution is divided into a supernatant and a precipitate. Discard the supernatant, keep the precipitate, add an appropriate amount of deionized water for stirring and washing, and form a suspension. Transfer the suspension to a 100mL centrifuge tube and centrifuge at 500-100rpm for 10-20min. The obtained p...

Embodiment 2

[0065] The KOH solid was dissolved in deionized water to prepare a KOH aqueous solution with a concentration of 8 mol / L, and cooled naturally to room temperature. Take 100mL of KOH aqueous solution and transfer it to a 500mL beaker, add 75g of Nb 2 o 5 , and the resulting suspension was magnetically stirred for 30 min. Dissolve 2.7 g of serine (Ser) in a small amount of deionized water, add it into the suspension, and continue magnetic stirring for 30 min.

[0066] Then, the suspension was added into a 50 mL stainless steel reactor with a filling degree of about 80 vol%, and heated to 140° C. for 6 h. After the reaction was finished, the reaction solution was transferred to a 100mL beaker and left to stand for a period of time, and the reaction solution was divided into supernatant and precipitate. Discard the supernatant, keep the precipitate, add an appropriate amount of deionized water for stirring and washing, and form a suspension. Transfer the suspension to a 100mL c...

Embodiment 3

[0070] Dissolve KOH solid and NaOH solid in deionized water successively to prepare a mixed alkaline aqueous solution with a concentration of 4 mol / L, wherein the molar ratio of KOH to NaOH is 1:1, and cool naturally to room temperature. Take 100mL of mixed alkali aqueous solution and transfer it to a 500mL beaker, add 55g Nb 2 o 5 , and the resulting suspension was magnetically stirred for 30 min. Dissolve 3.3 g of proline (Pro) in a small amount of deionized water, add it into the suspension, and continue magnetic stirring for 30 min.

[0071] Then, the suspension was added into a 50 mL stainless steel reactor with a filling degree of about 70 vol%, and heated to 160° C. for 2 h. After the reaction was finished, the reaction solution was transferred to a 100mL beaker and left to stand for a period of time, and the reaction solution was divided into supernatant and precipitate. Discard the supernatant, keep the precipitate, add an appropriate amount of deionized water for ...

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Abstract

The invention provides a method for amino acid assisted wet chemical synthesis of a niobate hydrate powder material. Amino acid small molecules are introduced into the field of piezoelectric ceramic research for the first time. According to the method, niobium pentoxide and high-concentration metal hydroxide alkali are subjected to a hydrothermal reaction at a low temperature, and amino acid is added as a crystal modifier in the reaction, so that a rod-like or sheet-like potassium niobate hydrate powder material can be obtained, and the preparation of high-performance niobate-based textured piezoelectric ceramic is facilitated. According to the method disclosed by the invention, alkali with higher concentration is used, wet chemical synthesis can be promoted to form more stable reaction precipitates at lower temperature, the action of the amino acid as a crystal modifier can be enhanced at lower reaction temperature, meanwhile, the reaction rate is lower at lower reaction temperature,the shape of the crystal can be more easily controlled, and the production cost can be saved. The method disclosed by the invention is energy-saving and environment-friendly and belongs to the category of green chemistry.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for amino acid-assisted wet chemical synthesis of niobate hydrate powder materials, and the niobate hydrate powder materials obtained by this method are only hydrated by sintering the niobate hydrate Niobate template material obtained from solid powder material. Background technique [0002] Lead-free piezoelectric ceramics is a kind of piezoelectric ceramics with satisfactory usability and good environmental protection. It has always been one of the important basic materials and research hotspots in the field of inorganic functional materials. Alkaline niobate is an emerging ceramic material due to its excellent ferroelectric, piezoelectric, photoelectric, photorefractive, and photocatalytic properties. Among them, potassium niobate (KNbO 3 ) has an orthorhombic crystal structure at room temperature, and has a high Curie temperature (>400°C), potassium so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
CPCC01G33/00C01P2004/03C01P2004/20C01P2004/10
Inventor 白杉洪梅王彦顶董磊
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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