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Potassium sodium niobate based single crystal and preparation method thereof

A potassium-sodium niobate-based, single-crystal technology, which is applied in the direction of single-crystal growth, single-crystal growth, chemical instruments and methods, etc., can solve problems such as small single-crystal size, achieve small segregation, uniform distribution of components, and good repeatability Effect

Inactive Publication Date: 2015-02-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for potassium sodium niobate-based materials, the size of single crystals grown by SSCG method is small, which has not yet reached a practical level.

Method used

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  • Potassium sodium niobate based single crystal and preparation method thereof
  • Potassium sodium niobate based single crystal and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] According to the chemical formula (K 0.45 Na 0.55 ) 0.98 Li 0.02 NbO 3 The K:Na:Li:Nb molar ratio is 0.441:0.539:0.02:1 equipped with K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 and Nb 2 o 5 Raw materials, using absolute ethanol as a ball milling medium, and planetary ball milling for 6 hours to obtain slurry. After the slurry was dried at 100°C for 8 hours, it was pre-fired at 850°C for 5 hours to synthesize powder raw materials, and 0.5mol% MnO was added 2 , using absolute ethanol as the ball milling medium to perform high-energy ball milling for 2 hours to obtain a slurry. The slurry after high-energy ball milling was dried at 100°C for 12 hours, and then KTaO in the direction with a size of 10mm×10mm×0.5mm 3 The single crystal seed crystal is buried in the dried powder, and uniaxially pressed to form a φ40mm disc, followed by 200MPa cold isostatic pressing to obtain a ceramic green body. Put the ceramic green body into the crucible, the inside of the crucible is ...

Embodiment 2

[0041] According to the chemical formula (K 0.45 Na 0.55 ) 0.96 Li 0.04 NbO 3 The K:Na:Li:Nb molar ratio is 0.432:0.528:0.04:1 equipped with K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 and Nb 2 o 5 Raw materials, using absolute ethanol as a ball milling medium, and planetary ball milling for 6 hours to obtain slurry. After the slurry was dried at 100°C for 8 hours, it was pre-fired at 850°C for 5 hours to synthesize powder raw materials, and 0.5mol% MnO was added 2 , using absolute ethanol as the ball milling medium to perform high-energy ball milling for 2 hours to obtain a slurry. The slurry after high-energy ball milling was dried at 100°C for 12 hours, and then KTaO in the direction with a size of 10mm×10mm×0.5mm 3 The single crystal seed crystal is buried in the dried powder, and uniaxially pressed to form a φ40mm disc, followed by 200MPa cold isostatic pressing to obtain a ceramic green body. Put the ceramic green body into the crucible, the inside of the crucible is ...

Embodiment 3

[0043] According to the chemical formula (K 0.45 Na 0.55 ) 0.94 Li 0.06 NbO 3 The K:Na:Li:Nb molar ratio is 0.423:0.517:0.06:1 equipped with K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 and Nb 2 o 5 Raw materials, using absolute ethanol as a ball milling medium, and planetary ball milling for 6 hours to obtain slurry. After the slurry was dried at 100°C for 8 hours, it was pre-fired at 850°C for 5 hours to synthesize powder raw materials, and 0.5mol% MnO was added 2 , using absolute ethanol as the ball milling medium to perform high-energy ball milling for 2 hours to obtain a slurry. The slurry after high-energy ball milling was dried at 100°C for 12 hours, and then KTaO in the direction with a size of 10mm×10mm×0.5mm 3 The single crystal seed crystal is buried in the dried powder, and uniaxially pressed to form a φ40mm disc, followed by 200MPa cold isostatic pressing to obtain a ceramic green body. Put the ceramic green body into the crucible, the inside of the crucible is ...

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Abstract

The invention relates to a potassium sodium niobate based single crystal and a preparation method thereof. The potassium sodium niobate based single crystal has a chemical formula of (K0.45Na0.55)[1-x]Li[x]NbO3, wherein x is not less than 0 and not more than 0.1, and the size of the potassium sodium niobate based single crystal is more than 10 mm. In combination with single crystal preparation and ceramic sintering processes, a small amount of combustion-supporting agent is introduced and single crystal seeds are adopted for induction, so that a ceramic matrix is converted into single crystals at the temperature lower than the melting point of the ceramic matrix, and the potassium sodium niobate based lead-free piezoelectric single crystal with the size of more than 10 mm is successfully prepared.

Description

technical field [0001] The invention relates to a potassium sodium niobate-based single crystal material and a preparation method thereof, belonging to the field of lead-free piezoelectric single crystal preparation. Background technique [0002] Piezoelectric materials are a class of important functional materials that can realize mutual conversion between mechanical energy and electrical energy, and are widely used in ultrasonic motors, high-frequency transducers, energy storage and sensors. However, the piezoelectric materials currently used are mainly lead-based materials, which contain a large amount of lead, which will bring great harm to human health and the environment. Therefore, the development of high-performance lead-free piezoelectric materials has become a very urgent task. task. Potassium sodium niobate-based ceramics have good electrical properties and high Curie temperature, and are considered to be one of the most likely piezoelectric material systems to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B1/02
CPCC30B1/02C30B29/30
Inventor 李永祥杨洁杨群保
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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