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A kind of preparation method of sodium bismuth titanate-lead titanate piezoelectric single crystal

A lead titanate piezoelectric, bismuth sodium titanate technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., to achieve the effects of excellent piezoelectric performance, wide operating temperature range, and good electric field stability

Inactive Publication Date: 2015-10-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no relevant technical report on the preparation of large-size NBT-PT single crystals by the crucible drop method so far.

Method used

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  • A kind of preparation method of sodium bismuth titanate-lead titanate piezoelectric single crystal
  • A kind of preparation method of sodium bismuth titanate-lead titanate piezoelectric single crystal
  • A kind of preparation method of sodium bismuth titanate-lead titanate piezoelectric single crystal

Examples

Experimental program
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Effect test

Embodiment 1

[0034] According to the general formula 0.91Na 0.5 Bi 0.5 TiO 3 -0.09PbTiO 3 Accurately weigh the raw materials of sodium carbonate, bismuth oxide, titanium dioxide and lead oxide powders with a stoichiometric purity greater than 99.99% and fully dry, and ball mill them for 24 hours to mix them evenly; then put them into a covered platinum crucible, Sintering at 1000°C for 6 hours; the sintered product is crushed, finely ground, sieved, and cold isostatically pressed into blocks as the starting material for single crystal growth;

[0035]A single-layer Ф20mm×200mm platinum crucible is selected as the growth crucible, and a -oriented NBT-PT single crystal with a size of Ф19.5mm×50mm is used as the seed crystal; the seed crystal and the starting material for single crystal growth are loaded and sealed Crucible, and then placed in the growth furnace (the present invention has no strict restrictions on the growth equipment, as long as the growth furnace device with temperature ...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is only:

[0043] The operation of preparing the starting material for single crystal growth is as follows: according to the general formula 0.99Na 0.5 Bi 0.5 TiO 3 -0.01PbTiO 3 Accurately weigh the raw materials of sodium carbonate, bismuth oxide, titanium dioxide and lead oxide powders with a stoichiometric purity greater than 99.99% and fully dry, and ball mill them for 24 hours to make them evenly mixed; After isostatic pressing into blocks, it is used as the starting material for single crystal growth.

[0044] The rest of the content is the same as described in Example 1.

[0045] The experimental results show that in this example, the crystal ingot size can reach Ф20mm×70mm, the Curie temperature is about 300°C, the depolarization temperature is about 176°C, and the piezoelectric constant d 33 Up to 280pC / N, electromechanical coupling coefficient k t Sodium bismuth titanate-lead titanate piezoelectric ...

Embodiment 3

[0047] The difference between this embodiment and embodiment 1 is only:

[0048] The operation of preparing the starting material for single crystal growth is as follows:

[0049] 1) According to the chemical formula Na 0.5 Bi 0.5 TiO 3 Accurately weigh sodium carbonate and bismuth oxide with a stoichiometric ratio of purity greater than 99.99%, ball mill for 24 hours to mix evenly, and then perform a solid-state reaction at 1100°C for 4 hours to sinter into NBT polycrystalline material;

[0050] 2) According to the chemical formula PbTiO 3 Accurately weigh titanium dioxide and lead oxide with a stoichiometric ratio of purity greater than 99.99%, ball mill for 24 hours to mix evenly, and then conduct a solid-state reaction at 1100°C for 4 hours to sinter into a PT polycrystalline material;

[0051] 3) According to the general formula 0.86Na 0.5 Bi 0.5 TiO 3 -0.14PbTiO 3 Accurately weigh the stoichiometric ratio of NBT and PT polycrystalline materials, ball mill for 24 ...

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Abstract

The invention discloses a preparation method of a sodium bismuth titanate-lead titanate piezoelectric monocrystal, which uses a crucible descent method. The method comprises the following steps: preparing a monocrystal growth initial material, carrying out monocrystal growth and growth completion by a crucible descent method, cooling to room temperature and the like. The invention adopts the crucible descent method for the first time to prepare the sodium bismuth titanate-lead titanate piezoelectric monocrystal (NBT-PT) with high Curie temperature and depolarization temperature; the size of the prepared NBT-PT monocrystal is up to phi 20mm*70mm; the prepared NBT-PT monocrystal has excellent piezoelectric properties and favorable electric field stability; the Curie temperature is up to 300 DEG C, the depolarization temperature is up to 176 DEG C, the piezoelectric constant d33 is up to 280pC / N, and the electromechanical coupling factor kt is up to 52%; the NBT-PT monocrystal has wide application temperature range; and the lead content is very low, and thus, the NBT-PT monocrystal satisfies the national and international environmental protection requirements, thereby having very wide application prospects.

Description

technical field [0001] The present invention relates to a kind of preparation method of relaxor ferroelectric single crystal, specifically, relate to a kind of bismuth sodium titanate-lead titanate piezoelectric single crystal [(1-x)Na 0.5 Bi 0.5 TiO 3 -x PbTiO 3 , abbreviated as NBT-PT] preparation method, which belongs to the technical field of single crystal growth. Background technique [0002] Lead-based composite perovskite structure relaxor ferroelectric single crystals represented by PMNT and PZNT have attracted much attention due to their excellent piezoelectric properties. 33 and k 33 It can reach 2500pC / N and more than 92% respectively, and the maximum strain can reach more than 1.7%. It is widely used in ultrasonic transducers, piezoelectric transformers, filters and ultrasonic motors. As an important functional material in electronic materials domain occupies a considerable proportion. However, although these materials have excellent electrical properties,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00C30B29/32
Inventor 陈建伟罗豪甦赵祥永李晓兵张海武徐海清王升王西安林迪任博狄文宁邓昊
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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