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Ferroelectric monocrystal lead ferrite niobate-lead ytterbium niobate-lead titanate and preparation method thereof

A technology of ferroelectric single crystal and lead ytterbium niobate, applied in the field of crystal technology and functional materials, can solve the problems of difficult growth of ferroelectric single crystal and not suitable for high-power devices, etc.

Inactive Publication Date: 2013-04-17
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to find a new type of ferroelectric single crystal and study its preparation process for the above-mentioned problems, so as to solve the problem that the existing high Curie temperature ferroelectric single crystal is difficult to grow and there is no ferroelectric single crystal suitable for high-power devices. Electric single crystal, adding a new product to ferroelectric single crystal materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] PFN-PYN-PT ferroelectric single crystal material was grown by high temperature solution method.

[0034] The initial raw material PbO or Pb 3 o 4 , Fe 2 o 3 、TiO 2 , Yb 2 o 3 , Nb 2 o 5 , co-solvent using PbO or Pb 3 o 4 and H 3 BO 3 or B 2 o 3 Composite co-solvent, weighed according to the proportion, mixed and ground. Put the uniformly mixed powder into a platinum crucible, and place the platinum crucible in a crystal growth furnace to form the material. Heat the prepared material above the supersaturation temperature, keep the temperature constant for a certain period of time, and then slowly cool down to grow; the temperature of the foam material is between 950-1200°C, and the temperature is lowered at a rate of 1-20°C per day; during the growth process, platinum wire can be used to hang In the center of the liquid surface, to form a nucleation center, reduce the number of nucleation and promote nucleation growth; after the growth is complete, cool do...

Embodiment 2

[0036] PFN-PYN-PT ferroelectric single crystals were grown by top-seed method.

[0037] The initial raw material PbO or Pb 3 o 4 , Fe 2 o 3 、TiO 2 , Yb 2 o 3 , Nb 2 o 5 , co-solvent using PbO or Pb 3 o 4 and H 3 BO 3 or B 2 o 3 Composite co-solvent, weighed according to the proportion, mixed and ground. Put the uniformly mixed powder into a platinum crucible, and place the platinum crucible in a crystal growth furnace to form the material. Heat the prepared material above the supersaturation temperature, keep the temperature for a certain period of time, and use the seed crystal to find the growth point to grow; grow at about 950-1100°C, the crystal rotation rate is 5-30rpm, and the cooling rate is 0.2-5°C per day; After the growth is over, the crystal is brought out of the liquid surface, and the temperature is lowered and annealed at 10-30°C / h. The grown single crystal is a square crystal with (001) natural growth surface exposed, the crystal quality is good,...

Embodiment 3

[0039] The PFN-PYN-PT ferroelectric crystal materials in Examples 1 and 2 were subjected to structure and performance tests, and the preferred component 0.10PFN-0.38PYN-0.52PT was subjected to structure and performance tests.

[0040] a) Cut the crystal into a small piece and grind it into powder for powder diffraction. According to the powder diffraction spectrum of the obtained ferroelectric crystal, it shows that the room temperature 0.10PFN-0.38PYN-0.52PT ferroelectric crystal has a trigonal perovskite structure.

[0041] b) Cut the obtained ferroelectric crystal material into a small slice according to the (001) direction, and then smooth both sides of the slice with different sandpapers. Silver electrodes were applied to both polished and smooth sides, and polarized under a DC electric field of 15kV / cm at 120°C for 15 minutes, then kept the electric field down to room temperature, and discharged for 24 hours. Prepared samples for piezoelectric properties d 33 and diele...

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Abstract

The invention discloses a novel ferroelectric crystal material of lead ferrite niobate-lead ytterbium niobate-lead titanate and a preparation method and an application thereof. The crystal material belongs to a perovskite type structure, has an MPB zone, and has a chemical formula of (1-x-y)Pb(Fe1 / 2Nb1 / 2)O3-xPb(Yb1 / 2Nb1 / 2)O3-yPbTiO3, PFN-PYN-PT for short, wherein x=0-0.6, y=0.05-0.6. The crystal grows by using a high temperature solution method or a top seed crystal method, and the grown crystal exhibits (001) a natural growth face quadrilateral crystal. Through X-ray powder diffraction, ferroelectric, dielectric and piezoelectric measurements, the structure, ferroelectric, dielectric and piezoelectric properties are analyzed. The crystal has good piezoelectric and electromechanical properties, has a high Curie temperature and good thermal stability, and has wide application prospects.

Description

technical field [0001] The invention relates to a novel ferroelectric single crystal and a preparation method thereof. Specifically, the present invention relates to a ferroelectric single crystal material (1-x-y)Pb(Fe 1 / 2 Nb 1 / 2 )O 3 -xPb(Yb 1 / 2 Nb 1 / 2 )O 3 -yPbTiO 3 , abbreviated as PFN-PYN-PT, and the crystal preparation method, structure and electrical properties, belong to the field of crystal technology and functional materials science. Background technique [0002] Ferroelectric / piezoelectric materials are widely used in various functional devices, such as sensors, transducers, sonar, drivers, filters, micro-speakers, etc., due to their excellent electromechanical conversion performance and fast response speed. It plays an irreplaceable and important role in national defense and security. BaTiO was discovered in the 1940s 3 Piezoelectric materials, Pb(Zr) was discovered in the 1950s 1-x Ti x )O 3 , PZT for short. PZT ceramic material is a traditional piez...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/30C30B9/06
Inventor 何超龙西法李修芝王祖建刘颖
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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