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Plate-like sodium bismuth titanate powder prepared by molten salt method, and preparation method thereof

A technology of sodium bismuth titanate powder and molten salt method, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of uneven size distribution and easy agglomeration of powder, and achieve uniform distribution and dispersibility. Good, large aspect ratio results

Inactive Publication Date: 2019-09-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the main method for preparing NBT powder is solid phase sintering, but the powder obtained by solid phase sintering is easy to agglomerate and has uneven size distribution due to high temperature treatment.

Method used

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  • Plate-like sodium bismuth titanate powder prepared by molten salt method, and preparation method thereof
  • Plate-like sodium bismuth titanate powder prepared by molten salt method, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A kind of molten salt method of the present invention prepares the method for tabular bismuth sodium titanate, comprises the steps:

[0035] Step 1, weigh Na proportionally 2 CO 3 、 Bi 2 o 3 、TiO 2 and NaCl, where Na2 CO 3 、 Bi 2 o 3 , and TiO 2 The mass ratio of oxide to NaCl is 0.5;

[0036] Step 2, these four kinds of mixtures and zirconia ball stone, dehydrated alcohol are added in the ball mill tank according to the mass ratio of 1:2:1, and dehydrated alcohol has submerged Na 2 CO 3 、 Bi 2 o 3 、TiO 2 , NaCl and zirconia balls, and spheroidal graphite for 4 hours, dried to obtain a uniformly mixed Na 2 CO 3 、 Bi 2 o 3 、TiO 2 and NaCl;

[0037] Step 3, putting the dried mixture into a crucible for calcination at a temperature of 900°C for 8 hours;

[0038] Step 4, grind the calcined product finely and sieve it into a beaker, wash it with 80°C deionized water for 7 times to remove Cl - Remove cleanly and test Cl with silver nitrate solution - whet...

Embodiment 2

[0042] A kind of molten salt method of the present invention prepares the method for tabular bismuth sodium titanate, comprises the steps:

[0043] Step 1, weigh Na proportionally 2 CO 3 、 Bi 2 o 3 、TiO 2 and NaCl, where Na 2 CO 3 、 Bi 2 o 3 , and TiO 2 The mass ratio of oxide to NaCl is 1;

[0044] Step 2, these four kinds of mixtures and zirconia ball stone, dehydrated alcohol are added in the ball mill tank according to the mass ratio of 1:2:1, and dehydrated alcohol has submerged Na 2 CO 3 、 Bi 2 o 3 、TiO 2 , NaCl and zirconia balls, and spheroidal graphite for 8 hours, and dried to obtain a uniformly mixed Na 2 CO 3 、 Bi 2 o 3 、TiO 2 and NaCl;

[0045] Step 3, putting the dried mixture into a crucible for calcination at a temperature of 1100°C for 2 hours;

[0046] Step 4, grind the calcined product finely and sieve it into a beaker, wash it with 85°C deionized water for 10 times to remove Cl - Remove cleanly and test Cl with silver nitrate solution ...

Embodiment 3

[0050] A kind of molten salt method of the present invention prepares the method for tabular bismuth sodium titanate, comprises the steps:

[0051] Step 1, weigh Na proportionally 2 CO 3 、 Bi 2 o 3 、TiO 2 and NaCl, where Na 2 CO 3 、 Bi 2 o 3 , and TiO 2 The mass ratio of oxide to NaCl is 0.8;

[0052] Step 2, these four kinds of mixtures and zirconia ball stone, dehydrated alcohol are added in the ball mill tank according to the mass ratio of 1:4:1, and dehydrated alcohol has submerged Na 2 CO 3 、 Bi 2 o 3 、TiO 2 , NaCl and zirconia balls, and spheroidal graphite for 12 hours, and dried to obtain uniformly mixed Na 2 CO 3 、 Bi 2 o 3 、TiO 2 and NaCl;

[0053] Step 3, putting the dried mixture into a crucible for calcination at a temperature of 1000°C for 6 hours;

[0054] Step 4, grind the calcined product finely and sieve it into a beaker, wash it with 90°C deionized water for 9 times to remove Cl - Remove cleanly and test Cl with silver nitrate solution ...

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Abstract

The present invention relates to plate-like sodium bismuth titanate powder prepared by a molten salt method, and a preparation method thereof. The method comprises: 1, calcining Na2CO3, Bi2O3, TiO2 and NaCl for 2-8 h at a temperature of 900-1100 DEG C to obtain a mixture A, wherein a ratio of the total mass of Na2CO3, Bi2O3 and TiO2 to the mass of NaCl is 0.5-1; and 2, removing the Cl<-> from themixture A, and drying to obtain the plate-like sodium bismuth titanate powder. According to the present invention, with the application of the molten salt method to prepare the sodium bismuth titanatepowder, the reaction can be carried out in an atomic state by the molten state NaCl, and the growth direction of the grain can be changed, such that the process is simple, the cost is low, the reaction cycle is short, the repeatability is good, and the Na0.5Bi0.5TiO3 powder has characteristics of good dispersibility, uniform distribution, low agglomeration degree and large aspect ratio.

Description

technical field [0001] The invention relates to the technical field of powder preparation by a molten salt method, in particular to a plate-shaped sodium bismuth titanate powder prepared by a molten salt method and a preparation method thereof. Background technique [0002] Piezoelectric ceramic materials are widely used in high-tech fields such as electronic information, integrated circuits, computers, automatic control, aerospace, marine surveying and mapping, communication technology, automobiles and energy, and become the basic materials for many new electronic components. It occupies a very important strategic position in the construction. Traditional piezoelectric ceramics include PZT-based binary and multi-component ceramic materials, and these materials are widely used. However, in PZT-based piezoelectric ceramics, the content of lead oxide accounts for about 70% of the total raw materials. It has caused two disadvantages. On the one hand, because PbO is a volatile ...

Claims

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Application Information

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IPC IPC(8): C01G29/00
CPCC01G29/006C01P2002/72C01P2004/03C01P2004/20C01P2006/80
Inventor 王卓王枭颖李银博陈浩楠孔梦蕾易志辉
Owner SHAANXI UNIV OF SCI & TECH
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