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Ternary system relaxation ferroelectric single crystal material and preparation method thereof

A relaxor ferroelectric single crystal and crystal technology, applied in the growth of polycrystalline materials, single crystal growth, single crystal growth, etc., can solve the difficulty of PINT single crystal crystallization, difficult batch growth, low Curie point of PMNT single crystal, etc. problem, to achieve the effect of excellent pyroelectric performance and good temperature stability

Inactive Publication Date: 2011-03-16
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

[0004] The present invention aims at the defects and problems existing in the above-mentioned prior art, and provides a kind of lead indium niobate-lead magnesium niobate-lead titanate ternary system relaxor ferroelectric single crystal material prepared by the improved Bridgman method to solve In the prior art, the Curie point of PMNT single crystal is too low and the defects of PINT single crystal crystallization are relatively difficult and difficult to grow in batches, adding a new type of product to this field

Method used

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  • Ternary system relaxation ferroelectric single crystal material and preparation method thereof
  • Ternary system relaxation ferroelectric single crystal material and preparation method thereof
  • Ternary system relaxation ferroelectric single crystal material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to the chemical formula of 0.23PIN-0.45PMN-0.32PT, accurately weigh In with a purity greater than 99.99% 2 o 3 , MgO, Nb 2 o 3 , PbO and TiO 2 Oxide raw materials, made into mixed raw materials; ball milled for 10 hours to obtain a uniformly mixed powder; pre-fired the mixed powder at 1000 ° C for 3 hours as the starting material for crystal growth; The starting material is placed in a platinum crucible, and the heterogeneous isomorphic PMNT with orientation is used as a seed crystal, which is loaded into a crystal growth furnace for crystal growth.

[0041] In order to prevent the volatilization of PbO and In 2 o 3 For sublimation, the platinum crucible containing the seeds and feedstock needs to be properly sealed. There are no strict restrictions on the thickness and shape of the crucible, and the thinner the better under the premise of being able to withstand the melt, in order to reduce the cost as much as possible. The number and shape of crucibl...

Embodiment 2

[0047] The difference between this example and Example 1 is that: according to the chemical formula of 0.42PIN-0.30PMN-0.28PT, In 2 o 3 , MgO, Nb 2 o 3 , PbO and TiO 2 The oxide raw material is made into a mixed raw material; all the other contents are exactly the same as those described in Example 1.

[0048] The ingot size of the prepared 0.42PIN-0.30PMN-0.28PT single crystal is Φ50mm×110mm.

[0049] Figure 6 It is the dielectric property ε of the oriented 0.42PIN-0.30PMN-0.28PT single crystal material and PMN-0.29PT single crystal material prepared in this example after polarization treatment r and tanδ at 1, 10, 100kHz respectively with the temperature change curve; by Figure 6 It can be seen that the trigonal and tetragonal phase transition temperature T of the oriented 0.42PIN-0.30PMN-0.28PT single crystal material prepared in this example rt reaches 152°C, while the Curie temperature T c It also reached 187°C, which is more than 50°C higher than the correspo...

Embodiment 3

[0053] The difference between this example and Example 1 is that: according to the chemical formula of 0.41PIN-0.17PMN-0.42PT, In 2 o 3 , MgO, Nb 2 o 3 , PbO and TiO 2 The oxide raw material is made into a mixed raw material; all the other contents are exactly the same as those described in Example 1.

[0054] The prepared 0.41PIN-0.17PMN-0.42PT single crystal is a tetragonal relaxor ferroelectric single crystal, and its optimal direction for pyroelectric application is the direction, which is different from the trigonal phase single crystal.

[0055] Figure 9 It is the dielectric temperature curve of the 0.41PIN-0.17PMN-0.42PT single crystal material prepared in Example 3 in the direction and the PMN-0.38PT single crystal material in the direction; Figure 9 It can be seen that the Curie temperatures of the two are 250°C and 180°C respectively; except for the ferroelectric-paraelectric phase transition, there are no other phase transition peaks, and their dielectric ...

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Abstract

The invention discloses a ternary system relaxation ferroelectric single crystal material. The material comprises the following chemical components: xPb(In1 / 2Nb1 / 2)O3-yPb(Mg1 / 3Nb2 / 3)O3-(1-x-y)PbTiO3, wherein the x is equal to 0.1-0.45, and the y is equal to 0.1-0.5. A preparation method of the single crystal material PIMNT is an improved Bridgman method and comprises the following steps of: processing raw materials, melting by raising the temperature, and performing crucible degrowth and crystal cooling growth. The prepared single crystal material overcomes the defects of over low Curie point of PMNT single crystals, difficult crystallization and difficult batch growth of the PINT single crystals in the prior art, has high piezoelectric performance and pyroelectric performance, higher temperature stability and wide application prospect and adds a new product in the field.

Description

technical field [0001] The invention relates to a ternary system relaxor ferroelectric single crystal material and its preparation method, in particular to a lead indium niobate-lead magnesium niobate-lead titanate ternary system prepared by an improved Bridgman method Relaxor ferroelectric single crystal material, its chemical composition is: xPb(In 1 / 2 Nb 1 / 2 )O 3 -yPb(Mg 1 / 3 Nb 2 / 3 )O 3 -(1-x-y)PbTiO 3 , abbreviated as: PIMNT, belongs to the technical field of crystal materials. Background technique [0002] Relaxor ferroelectric single crystal with composite perovskite structure is a kind of multifunctional and high performance smart material which has been successfully prepared and widely studied in recent years. Taking the well-studied binary system ferroelectric single crystal lead magnesium niobate-lead titanate (PMN-xPT) as an example, it has excellent piezoelectricity and thermal release near the quasi-isomorphic phase boundary (x=0.28~0.33). electrical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/30C30B29/32C30B11/00
Inventor 张耀耀罗豪甦刘林华赵祥永徐海清王升林迪李晓兵狄文宁王威刘大安吴啸
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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