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Method for preparing barium strontium niobate nanopowder by two-step co-precipitation method

A technology of barium strontium niobate and co-precipitation method, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve problems such as potential safety hazards, and achieve the effects of reduced preparation cost, easy operation, and easy reaction control.

Active Publication Date: 2020-04-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of this method, it is necessary to use a strong corrosive HF solution to dissolve Nb 2 o 5 , there are potential safety hazards in the experimental process

Method used

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  • Method for preparing barium strontium niobate nanopowder by two-step co-precipitation method
  • Method for preparing barium strontium niobate nanopowder by two-step co-precipitation method
  • Method for preparing barium strontium niobate nanopowder by two-step co-precipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] To prepare 0.025mol Sr 0.4 Ba 0.6 Nb 2 o 6 Taking nano powder as an example, the required raw materials are 21.16 grams of niobium oxalate, 3.87 grams of barium acetate, 2.13 grams of strontium nitrate, 100ml of 3mol / L ammonium carbonate solution, and 400ml of ammonia water. The specific operation is as follows:

[0025] 1. Prepare 3mol / L (NH 4 ) 2 CO 3 solution;

[0026] 2. Dissolve 21.16 grams of niobium oxalate, 3.87 grams of barium acetate and 2.13 grams of strontium nitrate in 300ml, 20ml and 20ml of deionized water respectively at room temperature, and keep stirring to obtain a transparent and clear aqueous solution of niobium oxalate, barium acetate and strontium nitrate;

[0027] 3. Take 100ml of the (NH 4 ) 2 CO 3 In the solution, after mixing the barium acetate and strontium nitrate solution prepared in step 2, add the (NH 4 ) 2 CO 3 in solution;

[0028] 4. Add the niobium oxalate solution prepared in step 2 dropwise to the mixed solution prepar...

Embodiment 2

[0037] To prepare 0.025mol Sr 0.5 Ba 0.5 Nb 2 o 6 Taking nano powder as an example, the required raw materials are 21.16 grams of niobium oxalate, 3.23 grams of barium acetate, 2.66 grams of strontium nitrate, 100ml of 3mol / L ammonium carbonate solution, and 400ml of ammonia water. The specific operation is as follows:

[0038] 1. Prepare 3mol / L (NH 4 ) 2 CO 3 solution;

[0039] 2. Dissolve 21.16 grams of niobium oxalate, 3.23 grams of barium acetate and 2.66 grams of strontium nitrate in 300ml, 20ml and 20ml of deionized water respectively at room temperature, and keep stirring to obtain a transparent and clear aqueous solution of niobium oxalate, barium acetate and strontium nitrate;

[0040] 3. Take 100ml of the (NH 4 ) 2 CO 3 In the solution, after mixing the barium acetate and strontium nitrate solution prepared in step 2, add the (NH 4 ) 2 CO 3 in solution;

[0041] 4. Add the niobium oxalate solution prepared in step 2 dropwise to the mixed solution prepar...

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Abstract

The invention discloses a method for preparing strontium barium niobate nano-powder through a two-step coprecipitation technology. The method adopts barium oxalate, barium acetate and barium nitrate as raw materials, ammonium carbonate as a precipitant and ammonia water as a pH adjuster. The preparation method comprises the following steps: respectively dissolving the lanthanum oxalate, lanthanumacetate and lanthanum nitrate in deionized water; mixing the obtained lanthanum acetate solution and the obtained lanthanum nitrate solution, adding the ammonium carbonate solution, carrying out fullstirring, and dropwise adding the obtained lanthanum oxalate solution to the above obtained mixed solution; adding the ammonia water to adjust the pH of the solution to 11, and carrying out full stirring; aging the stirred solution, filtering the aged solution, washing the obtained precipitate, and carrying out constant temperature drying on the washed precipitate in a 80 DEG C oven to obtain precursor powder; and calcining the powder to obtain the strontium barium niobate nano-powder. The method for preparing the strontium barium niobate nano-powder has the advantages of no toxic, highly-corrosive and expensive chemical reagents, simple device, compact process and low preparation cost, and the obtained nano-powder can be used to prepare strontium barium niobate ceramic having an electrocaloric effect.

Description

technical field [0001] The invention relates to the technical field of electric card refrigeration, in particular to a preparation method of a tungsten bronze structure dielectric ceramic nanopowder with a large electric card effect. Background technique [0002] The electric card effect refers to the phenomenon that polar materials produce adiabatic temperature change (ΔT) and isothermal entropy change (ΔS) under the action of an external electric field. Compared with traditional vapor-compression refrigeration, electric card refrigeration has higher refrigeration efficiency, does not produce greenhouse gases, and does not require the use of refrigerant Freon. It is a green and efficient refrigeration technology. The electric card effect can usually be regarded as the inverse effect of the pyroelectric effect, and barium strontium niobate is a kind of Pyroelectric materials, so it has great prospects for electric card refrigeration. [0003] There are many methods for pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/626C04B35/495C01G33/00
CPCC01G33/006C04B35/495C04B35/6262C04B2235/5445C04B2235/5454
Inventor 吴淑雅朱铖
Owner ZHEJIANG UNIV
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