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Ferroelectric piezoelectric single crystal lead holmium niobate-lead magnesium niobate-lead titanate as well as preparation and application thereof

A technology of lead holmium niobate and lead magnesium niobate, applied in the field of new ferroelectric single crystal, can solve the problems of difficult growth of ferroelectric single crystal and lack of high-power devices, etc.

Inactive Publication Date: 2014-04-09
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

[0006] The purpose of the present invention is to disclose a new type of ternary ferroelectric solid solution single crystal and study its preparation process, to solve the existing high Curie temperature ferroelectric single crystal difficult to grow and not suitable for high-power devices. Ferroelectric single crystal materials add a new product

Method used

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  • Ferroelectric piezoelectric single crystal lead holmium niobate-lead magnesium niobate-lead titanate as well as preparation and application thereof
  • Ferroelectric piezoelectric single crystal lead holmium niobate-lead magnesium niobate-lead titanate as well as preparation and application thereof
  • Ferroelectric piezoelectric single crystal lead holmium niobate-lead magnesium niobate-lead titanate as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The PHN-PMN-PT ferroelectric single crystal material was grown by high temperature solution method.

[0031] The initial raw material PbO or Pb 3 o 4 、Ho 2 o 3 , MgO, TiO 2 , 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 ratio of 0.12PHN-0.44PMN-0.44T, stirred, 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 up the crystal growth furnace until the mixed powder is in a molten state, and keep the temperature constant for a certain period of time; cool down at an appropriate cooling rate, then use PMN-PT as the seed crystal to find the supersaturation temperature, and carry out crystal growth at the supersaturation temperature, and rotate the seed crystal during the growth process , the temperature is lowered at a rate of 1-20 ° C per day, and the cooling rate is adjusted accordin...

Embodiment 2

[0033] The PHN-PMN-PT ferroelectric single crystal material was grown by high temperature solution method.

[0034] The initial raw material PbO or Pb 3 o 4 、Ho 2 o 3 , MgO, TiO 2 , 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 ratio of 0.14PHN-0.44PMN-0.42T, stirred, 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 1000-1100 °C, the crystal rotation rate is 5-30 rpm, and the cooling rate is 0.1-5 °C per day; After the growth is over, the crystal is lifted out of the liquid surface, and the temperature is lowered and annealed at 5-40°C / h. The grown single crystal is a square crystal with (001) natural g...

Embodiment 3

[0036] The PHN-PMN-PT ferroelectric single crystal material was grown by high temperature solution method.

[0037] The initial raw material PbO or Pb 3 o 4 、Ho 2 o 3 , MgO, TiO 2 , 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 ratio of 0.16PHN-0.44PMN-0.40T, stirred, 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 1000-1100 °C, the crystal rotation rate is 5-30 rpm, and the cooling rate is 0.1-5 °C per day; After the growth is over, the crystal is lifted out of the liquid surface, and the temperature is lowered and annealed at 5-40°C / h. The grown single crystal is a square crystal with (001) natural g...

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Abstract

The invention relates to ferroelectric piezoelectric single crystal lead holmium niobate-lead magnesium niobate-lead titanate as well as preparation and application of the ferroelectric piezoelectric single crystal lead holmium niobate-lead magnesium niobate-lead titanate. The crystal material is prepared by top seeded solution growth, belongs to a perovskite structure, has the following chemical formula: (1-x-y)Pb(Ho1 / 2Nb1 / 2)O3-xPb(Mg1 / 3Nb2 / 3)O3-yPbTiO3, simply recorded as PHN-PMN-PT or PHMNT. When the morphotropic phase boundary (MPB) area of the PHN-PMN-PT solid solution single crystal is in the range that x greater than 0 and less than 0.8, y is greater than 0.20 and less than 0.50, the curie temperature (Tc) of the PHN-PMN-PT crystal in MPB area and near the MPB area is 110-170 DEG C, triangle-square phase transition temperature (TRT) is 70-110 DEG C, coercive field (Ec) is (2.5-5kV / cm), piezoelectric coefficient d33 is (1100-3915pC / N), and the electromechanical coupling factor k33 reaches maximum 94.4%.

Description

technical field [0001] The invention relates to a novel ferroelectric piezoelectric single crystal and its preparation and application. Specifically, the present invention relates to a ferroelectric piezoelectric single crystal material (1-x-y)Pb(Ho 1 / 2 Nb 1 / 2 )O 3 -x Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -y PbTiO 3 , abbreviated as PHN-PMN-PT or PHMNT, and the crystal preparation method, structure and electrical properties, belong to the field of crystal technology and functional materials. Background technique [0002] Lead-based perovskite structure solid solutions, especially relaxor ferroelectric single crystal materials with lead titanate as a terminal component, are widely used in electromechanical coupling fields such as underwater acoustics, ultrasound, sensing and Micromechanical systems, especially in national defense construction, have extensive and important applications, and they are important functional ferroelectric materials that have attracted much attention. As a ...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B15/36
Inventor 李修芝龙西法
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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