Method for synthesizing flaky sodium niobate powder with large length-diameter ratio

A large aspect ratio, sodium niobate technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of uneven distribution, restricting the texture degree of piezoelectric ceramics, process instability, etc. Simple, low cost and simple preparation

Inactive Publication Date: 2014-11-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the flake size of sodium niobate powder prepared by this method is about 1 μm, and the distribution is very uneven, which greatly restricts the texture of piezoelectric ceramics; and the chemical method is used, the process is very unstable

Method used

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  • Method for synthesizing flaky sodium niobate powder with large length-diameter ratio
  • Method for synthesizing flaky sodium niobate powder with large length-diameter ratio
  • Method for synthesizing flaky sodium niobate powder with large length-diameter ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take Na 2 CO 3 Preparation of sheet-loaded Bi for raw materials 2.5 Na 3.5 Nb 5 o 18 Powder: weigh 6.524gBi 2 o 3 , 1.484gNa 2 CO 3 and 5.317gNb 2 o 5 , then weighed 14.658g NaCl powder, mixed all the powder with absolute ethanol ball mill for 24 hours, dried the mixed material, put it into an alumina crucible and put it in a furnace to keep warm for 1 hour at 805°C and heat up (the heating rate is 2°C / min) to the synthesis temperature of 1100°C for 2 hours, then cooled to room temperature with the furnace, put it into the Buchner funnel to wash away NaCl, and dried to obtain flake Bi 2.5 Na 3.5 Nb 5 o 18 Powder, figure 1 is based on Na 2 CO 3 Flake Bi prepared as raw material 2.5 Na 3.5 Nb 5 o 18 The SEM image of the powder, by figure 1 It can be seen that the prepared Bi 2.5 Na 3.5 Nb 5 o 18 The particle size range of the powder is 5μm-20μm, the thickness is 2μm, the size is uneven, and there are many fragments.

Embodiment 2

[0036] with K 2 CO 3 Preparation of sheet-loaded Bi for raw materials 2.5 Na 3.5 Nb 5 o 18 Powder: weigh 6.524gBi 2 o 3 , 1.935gK 2 CO 3 and 5.317gNb 2 o 5 , then weighed 15.153g of NaCl powder, mixed all the powder with absolute ethanol ball mill for 24 hours, dried the mixed material, put it into an alumina crucible and put it in a furnace to keep warm for 1 hour at 805°C and heat up (the heating rate is 2°C / min) to the synthesis temperature of 1000°C for 2 hours, then cooled to room temperature with the furnace, put it into a Buchner funnel to wash away NaCl, and dried to obtain flake Bi 2.5 Na 3.5 Nb 5 o 18 Powder, figure 2 is based on K 2 CO 3 Flake Bi prepared as raw material 2.5 Na 3.5 Nb 5 o 18 The SEM image of the powder, by figure 2 It can be seen that the prepared Bi 2.5 Na 3.5 Nb 5 o 18 The particle size range of the powder is 15μm-30μm, and the thickness is 1μm. From this it can be clearly seen that by K 2 CO 3 Na 2 CO 3 Made of raw...

Embodiment 3

[0038] Take Na 2 CO 3 with flake Bi 2.5 Na 3.5 Nb 5 o 18 The powder is used as the raw material, and NaCl is selected as the molten salt. According to the above chemical reaction formula (2), the flaky NaNbO can be prepared 3 Powder. The specific steps are as follows: Weigh 0.541gNa 2 CO 3 , 3.6gBi 2.5 Na 3.5 Nb 5 o 18 and 4.555g of NaCl powder, the powder is mixed, with absolute ethanol as the rolling medium, wherein the quality of zirconia balls is; rolling for 10 hours, after the discharge is dried, put it into an alumina crucible, and pre-burn it at 805 ° C for 1 After 1 hour, raise the temperature to 1000°C and keep it warm for 2 hours, then cool to room temperature with the furnace. Soak the prepared powder with boiling deionized water for one day, and constantly replace the deionized water, and clean it with ultrasonic waves until the AgNO 3 Solution test solution free of Cl after washing - (removal of NaCl). Then the cleaned product is repeatedly washed ...

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Abstract

The present invention relates to a method for synthesizing flaky sodium niobate powder with a large length-diameter ratio. The method comprises the following steps of preparing flaky Bi2.5Na3.5Nb5O18 powder from Bi2O3, alkali metal carbonate and Nb2O5 as raw materials in the presence of NaCl as molten salt by virtue of a molten-salt growth method, then placing flaky Bi2.5Na3.5Nb5O18 powder into a nylon barreling pot, adding zirconium oxide balls and anhydrous ethanol, barreling and then pre-sintering with NaCl molten salt, raising the temperature to the synthesis temperature, maintaining the temperature and cooling to obtain a powder mixture containing NaNbO3; finally cleaning the powder mixture containing NaNbO3 to obtain flaky sodium niobate powder with the large length-diameter ratio. Compared with a template prepared from Na2CO3 as a raw material, the template prepared from flaky sodium niobate powder disclosed by the invention is more uniform, larger in size and smaller in thickness and mainly used for preparing a lead-free piezoelectric textured ceramic, and the template with a large length-diameter ratio is more conductive to improving the texture degree and piezoelectric properties of the ceramic and is important significance of promoting the research on the lead-free piezoelectric ceramic.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric ceramics, in particular to a method for synthesizing flaky sodium niobate powder with a large aspect ratio. Background technique [0002] With the enhancement of people's awareness of environmental protection, lead-free piezoelectric ceramics have received extensive attention and research. However, lead-based piezoelectric ceramics are still widely used in electronic science and electronic products. Therefore, how to improve the piezoelectric performance of lead-free piezoelectric ceramics is the key to the problem. [0003] Ceramic texturing is an effective method to improve piezoelectric performance. One of the key technologies of this method is to prepare a sheet-like template material with a large aspect ratio. Sodium niobate NaNbO 3 The crystal has a perovskite structure, is chemically stable, and can be oriented, making it an ideal choice for template materials. Now flake NaNbO 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 沈波李玲玉白王峰翟继卫
Owner TONGJI UNIV
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