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Preparation method of flaky sodium niobate microcrystalline powder

A technology of microcrystalline powder and sodium niobate, which is applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc. problems such as poor body size uniformity, to achieve the effects of easy process control, high morphology asymmetry, and good width and thickness uniformity

Inactive Publication Date: 2010-08-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies in the prior art of poor morphology asymmetry of sodium niobate microcrystalline powder, powder impurity, poor size uniformity of powder, and wide distribution range of crystallite size, the present invention proposes a tablet Preparation method of sodium niobate microcrystalline powder

Method used

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Examples

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Embodiment 1

[0023] This embodiment is a preparation method of flake sodium niobate microcrystalline powder.

[0024] In this example, sodium carbonate, niobium pentoxide, bismuth trioxide and sodium chloride are used as raw materials to prepare sodium niobate microcrystalline powder by a two-step molten salt method. The specific preparation process is as follows:

[0025] In the first step, flake sodium bismuth niobate is synthesized by a one-step molten salt method. During the preparation:

[0026] 1. Sodium carbonate, niobium pentoxide and bismuth trioxide were mixed according to Bi 2.5 Na 3.5 Nb 5 o 18 The stoichiometric ratio is placed in a ball mill tank and added with absolute ethanol for ball milling for 24 hours, and dried to obtain a mixture of sodium carbonate, niobium pentoxide and bismuth trioxide;

[0027] 2. Weigh 30 grams of dried powder, weigh 15 grams of sodium chloride, put the weighed powder and sodium chloride in a ball mill tank for dry ball milling for 2 hours, a...

Embodiment 2

[0036] This embodiment is a preparation method of flake sodium niobate microcrystalline powder.

[0037] In this example, sodium carbonate, niobium pentoxide, bismuth trioxide and sodium chloride are used as raw materials to prepare sodium niobate microcrystalline powder by a two-step molten salt method. The specific preparation process is as follows:

[0038] In the first step, flake sodium bismuth niobate is synthesized by a one-step molten salt method. During the preparation:

[0039] 1. Sodium carbonate, niobium pentoxide and bismuth trioxide were mixed according to Bi 2.5 Na 3.5 Nb 5 o 18 The stoichiometric ratio is placed in a ball mill tank and added with absolute ethanol for ball milling for 24 hours, and dried to obtain a mixture of sodium carbonate, niobium pentoxide and bismuth trioxide;

[0040] 2. Weigh 60 grams of dried powder, weigh 30 grams of sodium chloride, put the weighed powder and sodium chloride in a ball mill tank for dry ball milling for 2 hours, a...

Embodiment 3

[0049] This embodiment is a preparation method of flake sodium niobate microcrystalline powder.

[0050] In this example, sodium carbonate, niobium pentoxide, bismuth trioxide and sodium chloride are used as raw materials to prepare sodium niobate microcrystalline powder by a two-step molten salt method. The specific preparation process is as follows:

[0051] In the first step, flake sodium bismuth niobate is synthesized by a one-step molten salt method. During the preparation:

[0052] 1. Sodium carbonate, niobium pentoxide and bismuth trioxide were mixed according to Bi2.5 Na 3.5 Nb 5 o 18 The stoichiometric ratio is placed in a ball mill tank and added with absolute ethanol for ball milling for 24 hours, and dried to obtain a mixture of sodium carbonate, niobium pentoxide and bismuth trioxide;

[0053] 2. Weigh 90 grams of dried powder, weigh 45 grams of sodium chloride, put the weighed powder and sodium chloride in a ball mill tank for dry ball milling for 2 hours, and...

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Abstract

The invention relates to a preparation method of flaky sodium niobate microcrystalline powder; first, sodium carbonate, niobium oxide, bismuth oxide and sodium chloride serve as preparation raw materials, and flaky bismuth sodium niobate with excellent asymmetric shape is synthesized; and then flaky bismuth sodium niobate, sodium carbonate and sodium chloride serve as preparation raw materials, and the flaky sodium niobate microcrystalline powder is synthesized through a molten salt method, wherein the ratio of the total weight of the sodium carbonate and the flaky bismuth sodium niobate to the weight of the sodium chloride is 2:1; and the sodium carbonate is fully excessive, and the molar ratio of the sodium carbonate to the flaky bismuth sodium niobate is 1.0 to 1.25:1. The flaky sodium niobate microcrystalline powder prepared by the invention does not cohere and has good dispersion, the width and thickness uniformity of the microcrystalline powder is good, the asymmetric shape is good and the crystalline phase is single. The preparation method of the flaky sodium niobate microcrystalline powder is characterized by simple preparation process, little pollution, small formula error, low cost, easy control of the process, good repeatability and stability of the product, and easy realization of industrial production.

Description

[0001] 1. Field [0002] The invention relates to the field of preparation of microcrystalline powder in material science, and relates to a preparation method of flaky sodium niobate microcrystalline powder. 2. Technical background [0003] Sodium niobate (NaNbO 3 ) is a multifunctional electronic material. This type of compound has a perovskite-like structure, low dielectric constant, high piezoelectricity, large frequency constant, low density, and a wide range of uses. In particular, the flaky sodium niobate microcrystalline powder with high morphology asymmetry can be used as a template material and added to ceramics to induce the grain orientation growth of ceramics. It is a key material in the preparation of related component textured ceramics. The flaky sodium niobate microcrystalline powder can ensure that the prepared functional material components are accurate, have good controllability and repeatability, and improve material performance. [0004] Due to the influe...

Claims

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Application Information

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IPC IPC(8): C01G33/00
Inventor 高峰邓贞奇宫明明王雪梅丁浩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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