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Lead scandium niobate-lead magnesium niobate-lead titanate ferroelectric single crystal and preparation method thereof

A lead magnesium niobate, ferroelectric single crystal technology, applied in the field of crystal technology and functional materials, can solve the problems of difficult growth of ferroelectric single crystal, no suitable high-power devices, etc., achieves small equipment investment, improves sensitivity and energy The effect of converting density, increasing detection range and resolution

Active Publication Date: 2016-05-18
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to find a new type of ferroelectric single crystal based on the above background and study its preparation method, to solve the existing high trigonal-tetragonal phase transition temperature ferroelectric single crystal difficult to grow and not suitable for high-power devices The ferroelectric single crystal, adding a new type of ferroelectric single crystal material

Method used

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  • Lead scandium niobate-lead magnesium niobate-lead titanate ferroelectric single crystal and preparation method thereof
  • Lead scandium niobate-lead magnesium niobate-lead titanate ferroelectric single crystal and preparation method thereof
  • Lead scandium niobate-lead magnesium niobate-lead titanate ferroelectric single crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 0.01PSN-0.66PMN-0.33PT ferroelectric single crystal was grown by high temperature solution method.

[0042] According to the chemical formula ScNbO 4 The composition of the initial raw material Nb 2 o 5 and Sc 2 o 3 , wet ball milling to mix evenly, and calcined at 1200 °C for 3 hours after compaction to synthesize the precursor ScNbO 4 ; According to the chemical formula MgNb 2 o 6 The composition of the initial raw material Nb 2 o 5 and 4MgCO 3 ·Mg(OH) 2 4H 2 O, wet ball milling to make it evenly mixed, compacted and calcined at 1000 °C for 6 hours to synthesize the precursor MgNb 2 o 6 ; According to the composition of 0.01PSN-0.66PMN-0.33PT, the initial raw materials PbO and TiO were weighed 2 and precursor ScNbO 4 , MgNb 2 o 6 Prepare the crystal raw material; the cosolvent is PbO, and the amount of the cosolvent added is 80% of the total mass of the raw material; the crystal raw material and the cosolvent are mixed uniformly by wet ball milling, an...

Embodiment 2

[0044] 0.04PSN-0.63PMN-0.33PT ferroelectric single crystal was grown by high temperature solution method.

[0045] Precursor ScNbO 4 , MgNb 2 o 6 The preparation is the same as in Example 1, and the initial raw materials PbO and TiO are weighed according to the composition of 0.04PSN-0.63PMN-0.33PT 2 and precursor ScNbO 4 , MgNb 2 o 6 Prepare the crystal raw material; the cosolvent is PbO, and the amount of the cosolvent added is 80% of the total mass of the raw material; the crystal raw material and the cosolvent are mixed uniformly by wet ball milling, and the ball milling time is 10 hours; the uniformly mixed raw material is put into a platinum crucible, and the platinum After the crucible is covered, it is placed in a crystal growth furnace to feed the material. The temperature of the feed is 1300°C, and the holding time is 10 hours; after the raw material is melted, it is continuously and slowly cooled at a slow cooling rate of 8°C / day, and the end temperature of the...

Embodiment 3

[0047] 0.06PSN-0.60PMN-0.34PT ferroelectric single crystal was grown by high temperature solution method.

[0048] According to the chemical formula ScNbO 4 The composition of the initial raw material Nb 2 o 5 and Sc 2 o 3 , dry ball milling to mix evenly, and calcined at 1200 °C for 3 hours after compaction to synthesize the precursor ScNbO 4 ; According to the chemical formula MgNb 2 o 6 The composition of the initial raw material Nb 2 o 5 and MgO, dry ball milling to make it evenly mixed, compacted and calcined at 1000°C for 6 hours to synthesize the precursor MgNb 2 o 6 ; Take the initial raw material Pb according to the composition of 0.06PSN-0.60PMN-0.34PT 3 o 4 、TiO 2 and precursor ScNbO 4 , MgNb 2 o 6 Preparation of crystal raw materials; cosolvent using Pb 3 o 4, the amount of co-solvent added is 55% of the total mass of raw materials; the crystal raw material and co-solvent are mixed evenly by dry ball milling, and the ball milling time is 20 hours; ...

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Abstract

The invention relates to a lead scandium niobate-lead magnesium diniobate-lead titanate ferroelectric monocrystal material and a preparation method thereof. The monocrystal material is a perovskite type structure; a chemical general formula of the monocrystal material is expressed as xPb(Scl / 2Nb1 / 2)O3-yPb(Mg1 / 3Nb2 / 3)O3-(1-x-y)PbTiO3, wherein x is greater than or equal to 0.01 and less than or equal to 0.10; y is greater than or equal to 0.50 and less than or equal to 0.70; 1-x-y is not equal to 0. The monocrystal is grown by using a bridgman-stockbarger method or a high-temperature solution method. By utilizing the monocrystal material, the defects of low rhombohedral-tetragonal phase change temperature of PMN-PT (lead magnesium diniobate) monocrystals and difficult crystallization and batch growth of PSN-PT (lead titanate) monocrystals in the prior art can be solved; the monocrystal is high in piezoelectric constant and high in rhombohedral-tetragonal phase change temperature, so that the monocrystal can be widely applied to ultrasonic transducers, underwater acoustic transducers and sensors.

Description

technical field [0001] The invention relates to a lead niobate scandate-lead magnesium niobate-lead titanate ferroelectric single crystal and a preparation method thereof. Specifically, the present invention relates to having higher trigonal-tetragonal phase transition temperature T rt and piezoelectric constant d 33 The ferroelectric single crystal material xPb(Sc 1 / 2 Nb 1 / 2 )O 3 -yPb(Mg 1 / 3 Nb 2 / 3 )O 3 -(1-x-y)PbTiO 3 , abbreviated as xPSN-yPMN-(1-x-y)PT, and the crystal preparation method, structure and electrical properties, belong to the field of crystal technology and functional materials. Background technique [0002] Large size lead niobate zincate-lead titanate [Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 , abbreviated as PZN-PT] and lead magnesium niobate-lead titanate [Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 , abbreviated as PMN-PT] the birth of the relaxor ferroelectric single crystal, with its high piezoelectric coefficient, high dielectric constant, high strain, hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B11/00
Inventor 惠增哲龙伟李晓娟方频阳常芳娥
Owner XIAN TECH UNIV
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