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Method for preparing stoichiometric ratio strontium potassium niobate needle-shaped microcrystal powder

A stoichiometric ratio, strontium potassium niobate technology, applied in chemical instruments and methods, inorganic chemistry, niobium compounds, etc., can solve the problem of low Curie temperature of strontium potassium niobate ceramics, which limits the development of strontium potassium niobate ceramic materials, chemical Composition deviates from the stoichiometric ratio, etc., to achieve the effects of easy control of the process, less mechanical pollution, and less deviation of the formula

Active Publication Date: 2019-03-22
浙江衢州欧希贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the method for preparing microcrystalline strontium potassium niobate with anisotropy is mainly the molten salt method (Gao Feng. A method for preparing needle-like potassium strontium niobate microcrystal powder [P]. Chinese invention patent, CN102616852B), but The chemical composition of the obtained powder deviates from the stoichiometric ratio, resulting in a low Curie temperature of strontium potassium niobate ceramics synthesized from the powder, which is only 82°C (L.Liu. Microstructure, dielectric anomaly and pinched hysteresis loops ofgrain- oriented KSr 2 Nb 5 o 15 ferroelectric ceramics[J]. Journal of MaterialsScience: Materials in Electronics 29 (2018) 9635–9642), which greatly limits the development of strontium potassium niobate ceramic materials

Method used

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  • Method for preparing stoichiometric ratio strontium potassium niobate needle-shaped microcrystal powder
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  • Method for preparing stoichiometric ratio strontium potassium niobate needle-shaped microcrystal powder

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Embodiment 1

[0025] This embodiment is a method for preparing acicular microcrystalline powder with a stoichiometric ratio of strontium potassium niobate, and its specific process is:

[0026] Step 1: Prepare the stock mixture. will analyze pure SrCO 3 and Nb 2 o 5 Powder, weighed according to the molar ratio of 1:1.25. Weigh the KCl powder. The weighed SrCO 3 , Nb 2 o 5 and KCl were placed in a polyethylene ball mill jar. Add absolute ethanol to a polyethylene ball mill jar and mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 80°C for 10 hours to obtain a dry powder. The dry powder was ground into a powder by an agate mortar to obtain a raw material mixture. The quality of the KCl and the weighed SrCO 3 and Nb 2 o 5 The ratio of the sum of the masses is 1.5:1. Described dehydrated alcohol and the SrCO that is placed in the polyethylene ball mill jar 3 , Nb 2 o 5 The mass ratio of the powder composed of KCl and KCl is 2:1. ...

Embodiment 2

[0033] Step 1: Prepare the stock mixture. will analyze pure SrCO 3 and Nb 2 o 5 Powder, weighed according to the molar ratio of 1:1.25. Weigh the KCl powder. The weighed SrCO 3 , Nb 2 o 5and KCl were placed in a polyethylene ball mill jar. Add absolute ethanol to a polyethylene ball mill jar and mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 80°C for 10 hours to obtain a dry powder. The dry powder was ground into a powder by an agate mortar to obtain a raw material mixture. The quality of the KCl and the weighed SrCO 3 and Nb 2 o 5 The ratio of the sum of the masses is 2.5:1. Described dehydrated alcohol and the SrCO that is placed in the polyethylene ball mill jar 3 , Nb 2 o 5 The mass ratio of the powder composed of KCl and KCl is 3:1.

[0034] Step 2: Compress the raw material mixture. The obtained raw material mixture is placed in a mold, and pressed into a raw material mixture block under the condition ...

Embodiment 3

[0038] Step 1: Prepare the stock mixture. will analyze pure SrCO 3 and Nb 2 o 5 Powder, weighed according to the molar ratio of 1:1.25. Weigh the KCl powder. The weighed SrCO 3 , Nb 2 o 5 and KCl were placed in a polyethylene ball mill jar. Add absolute ethanol to a polyethylene ball mill jar and mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 80°C for 10 hours to obtain a dry powder. The dry powder was ground into a powder by an agate mortar to obtain a raw material mixture. The quality of the KCl and the weighed SrCO 3 and Nb 2 o 5 The ratio of the sum of the masses is 3:1. Described dehydrated alcohol and the SrCO that is placed in the polyethylene ball mill jar 3 , Nb 2 o 5 The mass ratio of the powder composed of KCl and KCl is 4:1.

[0039] Step 2: Compress the raw material mixture. The obtained raw material mixture is placed in a mold, and pressed under the condition of 150 MPa to form a raw material m...

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Abstract

The invention discloses a method for preparing stoichiometric ratio strontium potassium niobate needle-shaped microcrystal powder. The method comprises the following steps: I, preparing a raw materialmixture, namely weighing analytically pure SrCO3 and Nb2O5 powder and KCl powder, and putting in a ball milling tank for grinding; II, pressing the raw material mixture, namely pressing the raw material mixture in a mold so as to obtain a raw material mixture block; III, preparing strontium potassium niobate microcrystal powder, namely calcining the raw material mixture in a corundum crucible, washing and filtering after calcining, and carrying out drying and washing on the powder material so as to obtain the strontium potassium niobate microcrystal powder; IV, preparing needle-shaped strontium potassium niobate microcrystal powder, namely carrying out magnetic stirring with distilled water, settling, pouring off supernate, and drying the settled powder material, thereby obtaining the stoichiometric ratio strontium potassium niobate needle-shaped microcrystal powder. By adopting the method, the product purity is high, requirements of anisotropy mold plates can be met, the mechanical pollution is small, the formula derivation is small, the process is easy to control, and the product has high reproducibility and stability.

Description

technical field [0001] The invention relates to a method for preparing acicular microcrystalline powder with a stoichiometric ratio of strontium potassium niobate, which belongs to the technical field of microcrystalline powder preparation in material science. Background technique [0002] Potassium strontium niobate (KSr) with tungsten bronze structure 2 Nb 5 o 15 ) The material has strong spontaneous polarization and obvious optical birefringence effect, and the electro-optic coefficient of strontium potassium niobate single crystal is about LiNbO 3 7 times that of single crystal, and has broad application space in the fields of optoelectronics, ferroelectricity, dielectric and laser. Compared with single crystals, potassium strontium niobate textured ceramics have the advantages of short preparation period and low cost, which makes the texturing of potassium strontium niobate ceramics develop rapidly. If the needle-shaped potassium strontium niobate microcrystalline p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
CPCC01G33/006C01P2002/72C01P2004/03C01P2004/10
Inventor 刘亮亮张拯王永强吕蕊蒋海炜
Owner 浙江衢州欧希贸易有限公司