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Preparation method of cylindrical strontium sodium niobate crystallite powder

A technology of sodium strontium niobate and microcrystalline powder, which is applied in the fields of chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of powder morphology damage, etc., and achieve easy control of the process, high purity, and simple steps Effect

Active Publication Date: 2013-01-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Reaction of strontium potassium niobate microcrystalline powder with anisotropic morphology and potassium chloride, a large number of experiments through optimizing process parameters found that sodium ions replaced potassium ions in strontium potassium niobate to form strontium niobate Sodium powder, but under the optimal process conditions, the morphology of a part of the powder is still destroyed

Method used

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  • Preparation method of cylindrical strontium sodium niobate crystallite powder
  • Preparation method of cylindrical strontium sodium niobate crystallite powder
  • Preparation method of cylindrical strontium sodium niobate crystallite powder

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Embodiment 1

[0019] This embodiment is a preparation method of columnar sodium strontium niobate microcrystalline powder, and its specific process is:

[0020] Step 1: Ingredients. The composition of the sodium strontium niobate is: Sr 2 NaNb 5 o 15 . The analytically pure strontium carbonate and niobium pentoxide powders are weighed and mixed in a molar ratio of 1:1.25 to obtain an oxide mixture formed of strontium carbonate and niobium pentoxide. Weigh and mix sodium chloride and potassium chloride in a molar ratio of 1:1 to obtain the desired molten salt. The obtained oxide mixture is mixed with molten salt to obtain a raw material mixture; the mass ratio of the molten salt to the oxide mixture is 5:1. The weighed raw material mixture is placed in a nylon ball mill jar.

[0021] Step 2: Ball milling. Add absolute ethanol to a nylon ball mill jar and mill on a ball mill for 12 hours. The mass ratio of the absolute ethanol to the raw material mixture placed in the nylon ball mill ...

Embodiment 2

[0026] This embodiment is a preparation method of columnar sodium strontium niobate microcrystalline powder, and its specific process is:

[0027] Step 1: Ingredients. The composition of sodium strontium niobate is designed to be: Sr 2 NaNb 5 o 15 . The analytically pure strontium carbonate and niobium pentoxide powders are weighed according to a molar ratio of 1:1.25 to obtain an oxide mixture formed of strontium carbonate and niobium pentoxide. Sodium chloride and potassium chloride are weighed in a molar ratio of 1:1 to obtain the desired molten salt. The mass ratio of the molten salt to the oxide mixture is 4:1 to obtain a raw material mixture. The weighed raw material mixture is placed in a nylon ball mill jar.

[0028]Step 2: Ball milling. Add absolute ethanol to a nylon ball mill jar and mill on a ball mill for 12 hours. The mass ratio of the absolute ethanol to the raw material mixture placed in the nylon ball mill jar is 1.5:1.

[0029] Step 3: Dry. The ball...

Embodiment 3

[0033] This embodiment is a preparation method of columnar sodium strontium niobate microcrystalline powder, and its specific process is:

[0034] Step 1: Ingredients. The composition of sodium strontium niobate is designed to be: Sr 2 NaNb 5 o 15 . The analytically pure strontium carbonate and niobium pentoxide powders are weighed according to a molar ratio of 1:1.25 to obtain an oxide mixture formed of strontium carbonate and niobium pentoxide. Sodium chloride and potassium chloride are weighed in a molar ratio of 1:1 to obtain the desired molten salt. The mass ratio of the molten salt to the oxide mixture is 3:1 to obtain a raw material mixture. The weighed raw material mixture is placed in a nylon ball mill jar.

[0035] Step 2: Ball milling. Add absolute ethanol to a nylon ball mill jar and mill on a ball mill for 12 hours. The mass ratio of the absolute ethanol to the raw material mixture placed in the nylon ball mill jar is 1.5:1.

[0036] Step 3: Dry. The bal...

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Abstract

Disclosed is a preparation method of cylindrical strontium sodium niobate crystallite powder. The strontium sodium niobate crystallite powder is prepared by a one-step molten salt method. The preparation method includes firstly, synthesizing strontium potassium niobate crystallite powder having anisotropic shapes; and secondly, exchanging sodium ion with potassium ion to obtain final product cylindrical strontium sodium niobate crystallite powder. The obtained strontium sodium niobate crystallite powder has no other impurities, is single-phase crystallite powder in square tungsten bronze structure, has cylindrical appearance with anisotropic shapes, is about 11-87micrometers in length and about 3-9micrometers in diameter and is not adhered to one another, particle is even and dispersibility is high. The preparation method is simple and convenient, the obtained product is high in purity, size is controllable, agglomeration is avoided, the requirement for anisotropic template is met, mechanical pollution is small, deviation of a formula is small, process is easy to control, reproducibility and stability of the strontium sodium niobate crystallite powder are high, and industrialization is facilitated.

Description

technical field [0001] The invention relates to the technical field of microcrystalline powder preparation in material science, in particular to a method for preparing columnar sodium strontium niobate microcrystalline powder with high shape anisotropy. Background technique [0002] Sodium strontium niobate (Sr 2 NaNb 5 o 15 ) belongs to the tetragonal tungsten bronze structure, which has the characteristics of high spontaneous polarization, high Curie temperature, and low dielectric constant. Its microstructure has an important influence on its ferroelectric properties. Studies have shown (Lingling Wei et al.Fabrication of textured Sr 2 Na 0.9 K 0.1 Nb 5 o 15 ceramics: Anisotropy in structures and electrical properties[J].Journal of the European Ceramic Society 32(2012)3773-3780), the anisotropic strontium potassium niobate (Sr 2 kNb 5 o 15 ) microcrystalline powder is added as a template into sodium strontium niobate ceramics, which can induce the preferential o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 高峰刘亮亮胡国辛黄茜茜李金锦田长生
Owner NORTHWESTERN POLYTECHNICAL UNIV
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