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Preparation method of barium sodium niobate cylindrical monocrystal particle

A single crystal particle, barium sodium niobate technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of unsatisfactory performance and difficult to control components accurately, and achieve uniform size, Ease of large-scale production and high efficiency

Inactive Publication Date: 2004-05-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that sodium barium niobate is prepared by vacuum precipitation, but it is difficult to precisely control the components in this method; there have also been people who have used sol-gel technology to prepare sodium barium niobate, but the obtained crystal has no preferred orientation, and its performance is not very good. ideal
However, there is no report on high-purity barium sodium niobate columnar single crystal particles with a certain length-to-diameter ratio.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: the component of the sodium barium niobate of design is Ba 2 NaNb 5 o 15 . Weigh high-purity BaCO with a molar ratio of 1:1 according to the components 3 with Nb 2 o 5 As raw material, its purity is 99.999%, namely BaCO 3 4.2608 g, Nb 2 o 5 5.7392 grams, put the two into an agate jar equipped with agate balls, use absolute alcohol as the medium, ball mill for 2 to 3 hours, then add 20 grams of NaCl salt according to the ratio of salt to material ratio 2:1, and then ball mill 2 to 3 hours to make the mixture even, then dry and sieve.

[0017] The above-mentioned dried and mixed raw materials were put into an alumina crucible, and after sealing, the temperature was raised to 1200°C at a rate of 200°C / h, and calcined for 4 hours. The synthesized product was cooled to room temperature with the furnace.

[0018] The synthesized product was rinsed 10 times in distilled water to remove residual molten salt, and finally obtained barium sodium niobate s...

Embodiment 2

[0021] Embodiment 2: The process steps of this embodiment are exactly the same as those of the above-mentioned embodiment 1, and high-purity BaCO is still used 3 with Nb 2 o 5 As raw material, its molar ratio is 1:1, the difference is that the ratio of salt to material is changed to 1:1. That is, 10 grams of NaCl salt was added, and the synthesized product was determined to be single-phase sodium barium niobate by XRD. Compared with the synthetic material in Example 1, this synthetic powder has a smaller aspect ratio, with a diameter of 1-3 μm and an aspect ratio of 2-4.

Embodiment 3

[0022] Embodiment 3: The process steps of this embodiment are exactly the same as those of the above-mentioned embodiment 1, the difference is that the ratio of salt to material is changed to 4:1. That is, 40 grams of NaCl salt was added, and the composite was determined to be single-phase sodium barium niobate by XRD. Observed by scanning electron microscope, it is columnar crystal grains, the distribution is relatively uniform, and the crystal grains are relatively coarse, with a diameter of 6-8 μm and an aspect ratio of 2-5.

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Abstract

A process for preparing the cylindrical monocrystal particles of sodium barium niobate by salt smelting method features that the raw materials (BaCO3 and Nb2O3) and the medium (NaCl) are used to synthesize said cylindrical monocrystal particles in the high-temp fused Na salt. Its advantages are high efficiency and high purity and reaction activity of said particles used to prepare the ceramics with texture structure.

Description

technical field [0001] The invention relates to a method for preparing barium sodium niobate columnar single crystal particles, belonging to the field of material preparation. Background technique [0002] Sodium barium niobate has been widely used in electro-optic, nonlinear optics and other fields. The research work on barium sodium niobate mainly focuses on the preparation and performance of single crystal. Sodium barium niobate single crystal has excellent performance, but the high cost and defects caused by preparation limit its wide application in engineering. In contrast, the preparation of ceramics has the characteristics of low preparation cost and easy preparation of large-scale and complex-shaped components, which makes its preparation more and more attention. It has been reported in the literature that sodium barium niobate is prepared by vacuum precipitation, but it is difficult to precisely control the components in this method; there have also been people wh...

Claims

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Application Information

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IPC IPC(8): C30B1/00C30B9/12C30B29/30
Inventor 朱丽慧徐炯黄清伟赵海峰
Owner SHANGHAI UNIV
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