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Method for preparing micro crystalline powder of pure potassium strontium niobite

A technology of strontium potassium niobate and microcrystalline powder, which is applied in chemical instruments and methods, niobium compounds, sodium/potassium compounds, etc., and can solve problems such as wide distribution range of microcrystalline size, poor powder size uniformity, and poor asymmetry , to achieve the effect of good product reproducibility and stability, low cost and single crystal phase

Inactive Publication Date: 2005-10-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies in the prior art of poor microcrystalline powder morphology asymmetry, powder impurity, poor powder size uniformity, and wide distribution range of crystallite size, the present invention proposes a one-step molten salt method to prepare Potassium strontium niobate microcrystalline powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw materials used in this embodiment are strontium carbonate, niobium pentoxide and potassium chloride, wherein the ratio of strontium carbonate to niobium pentoxide is 4:5; the ratio of potassium chloride to strontium carbonate and niobium pentoxide mixture is 1.9 : 1.

[0019] This embodiment adopts one-step molten salt method to prepare, and concrete method is:

[0020] (1) Adopting strontium carbonate and niobium pentoxide as raw materials, the two are prepared in proportion and placed in a ball mill tank, after adding ball milling media and mixing for 24 hours, drying the slurry to obtain a mixture of strontium carbonate and niobium pentoxide;

[0021] (2) Potassium chloride was placed in a ball mill tank for dry ball milling for 4 hours to obtain pulverized potassium chloride fine powder.

[0022] (3) Take by weighing the mixture of 10 grams of strontium carbonate and niobium pentoxide, take by weighing 19 grams of potassium chloride fine powder, the two are...

Embodiment 2

[0025] The raw materials used in this embodiment are strontium carbonate, niobium pentoxide and potassium chloride, wherein: the ratio of strontium carbonate to niobium pentoxide is 4:5; the ratio of potassium chloride to strontium carbonate and niobium pentoxide mixture is 1.2 : 1.

[0026] This embodiment adopts one-step molten salt method to prepare, and concrete method is:

[0027] (1) Adopting strontium carbonate and niobium pentoxide as raw materials, the two are prepared in proportion and placed in a ball mill tank, after adding ball milling media and mixing for 24 hours, drying the slurry to obtain a mixture of strontium carbonate and niobium pentoxide;

[0028] (2) Potassium chloride was placed in a ball mill tank for dry ball milling for 4 hours to obtain pulverized potassium chloride fine powder.

[0029] (3) Take by weighing the mixture of 20 grams of strontium carbonate and niobium pentoxide, take by weighing 24 grams of potassium chloride fine powder, the two ar...

Embodiment 3

[0032] The raw materials used in this embodiment are strontium carbonate, niobium pentoxide and potassium chloride, wherein: the ratio of strontium carbonate to niobium pentoxide is 4:5; the ratio of potassium chloride to strontium carbonate and niobium pentoxide mixture is 1.6 : 1.

[0033] This embodiment adopts one-step molten salt method to prepare, and concrete method is:

[0034] (1) Adopting strontium carbonate and niobium pentoxide as raw materials, the two are prepared in proportion and placed in a ball mill tank, after adding ball milling media and mixing for 24 hours, drying the slurry to obtain a mixture of strontium carbonate and niobium pentoxide;

[0035] (2) Potassium chloride was placed in a ball mill tank for dry ball milling for 4 hours to obtain pulverized potassium chloride fine powder.

[0036] (3) Take by weighing the mixture of 50 grams of strontium carbonate and niobium pentoxide, take by weighing 80 grams of potassium chloride fine powder, the two ar...

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Abstract

The present invention relates to a pure strontium potassium niobate microcrystal powder body and its preparation method. Said method includes the following steps: mixing strontium carbonate and columnbium pentoxide according to the ratio of 4:5, grinding potassium chloride, fully mixing said ground potassium chloride and mixture of strontium carbonate and columnbium pentoxide according to 1.2-2:1, roasting for 2-6 hr at 1150 deg.C, repeatedly washing the roasted product, until when the roaste dproduct has not chlorine ion, drying so that the obtained powder body is the strontium potassium niobate microcrystal powder and tetragonal tungsten bronze structure.

Description

[0001] (1) Field [0002] The invention relates to the field of preparation of microcrystalline powder in material science, and relates to pure potassium strontium niobate microcrystalline powder with high asymmetric morphology and a preparation method thereof. (2) Technical background [0003] Potassium strontium niobate is a multifunctional electronic material with a wide range of applications. In particular, strontium potassium niobate microcrystalline powder with high morphology asymmetry can be used as a template material to be mixed into ceramics to induce the grain orientation growth of ceramics, which is a key material in the preparation of related component textured ceramics. The pure strontium potassium niobate microcrystalline powder can ensure the accurate composition of the prepared functional material, have good controllability and repeatability, and improve material performance. At present, the preparation methods of potassium strontium niobate crystallites mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
Inventor 赵丽丽刘向春高峰田长生
Owner NORTHWESTERN POLYTECHNICAL UNIV
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