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Lead lutetioniobate-lead magnesioniobate-lead titanate ternary-system relaxation ferroelectric monocrystal and preparation method thereof

A lead titanate ternary system, relaxor ferroelectric single crystal technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve difficult application requirements, small single crystal and other problems, and achieve huge applications Potential, high Curie temperature, broad application prospects

Inactive Publication Date: 2012-12-12
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

[0004] In order to solve the problem of temperature stability of PMNT single crystals, some lead-based relaxor ferroelectric single crystal systems with high Curie temperature have been studied in recent years, such as Pb(In 1 / 2 Nb 1 / 2 )O 3 -PbTiO 3 Single crystal (PINT), Pb(Sc 1 / 2 Nb 1 / 2 )O 3 -PbTiO 3 Single crystal (PSNT), Pb (Yb 1 / 2 Nb 1 / 2 )O 3 -PbTiO 3 Single crystal (PYNT), etc., its Curie temperature and trigonal-tetragonal phase transition temperature can reach up to 350°C and 200°C, which are close to the commonly used piezoelectric ceramic materials, but the crystal growth adopts the traditional flux method. The single crystal grown by nucleation is relatively small, which is difficult to meet the actual application requirements

Method used

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  • Lead lutetioniobate-lead magnesioniobate-lead titanate ternary-system relaxation ferroelectric monocrystal and preparation method thereof
  • Lead lutetioniobate-lead magnesioniobate-lead titanate ternary-system relaxation ferroelectric monocrystal and preparation method thereof
  • Lead lutetioniobate-lead magnesioniobate-lead titanate ternary-system relaxation ferroelectric monocrystal and preparation method thereof

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Embodiment 1

[0031] According to the chemical formula 0.13PLN-0.57PMN-0.30PT, accurately weigh Lu with a stoichiometric ratio greater than 99.99% in purity 2 o 3 , MgO, Nb 2 o 5 , PbO and TiO 2 Each powder raw material was ball-milled for 24 hours to make the mix uniform; then sintered at 1050° C. for 6 hours to obtain a starting material for single crystal growth; the starting material for single crystal growth was placed in a sealed platinum crucible (the thickness of the crucible and The shape is not strictly limited. In order to reduce the cost, multiple crucibles in one furnace are preferred, especially special-shaped crucibles. You can refer to multiple published patents of the Shanghai Institute of Ceramics, Chinese Academy of Sciences, such as CN1113970A); put the crucible in the crystal growth furnace; The heterogeneous and isomorphic lead magnesium niobate-lead titanate single crystal (PMNT) without body defects is selected as the seed crystal; the crucible descent method is u...

Embodiment 2

[0039] According to the chemical formula 0.30PLN-0.40PMN-0.30PT, accurately weigh Lu with a stoichiometric ratio greater than 99.99% in purity 2 o 3 , MgO, Nb 2 o 5 , PbO and TiO 2 Each powder raw material was ball-milled for 24 hours to mix uniformly; then sintered at 1100° C. for 4 hours to obtain a starting material for single crystal growth; the starting material for single crystal growth was placed in the same platinum crucible as described in Example 1 , and then put the crucible into the crystal growth furnace; select the heterogeneous direction lead magnesium niobate-lead titanate single crystal (PMNT) without bulk defects as the seed crystal; use the crucible drop method for crystallization Growth: Control the temperature of the crystal growth furnace at 1400-1450°C, the holding time of the molten material is 7 hours, the crucible's descending rate is 0.1-0.8mm / h, and the maximum temperature gradient in the crucible's descending direction is 5-7°C / mm; when the gro...

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Abstract

The invention discloses a lead lutetioniobate-lead magnesioniobate-lead titanate ternary-system relaxation ferroelectric monocrystal and a preparation method thereof. The chemical general formula of the monocrystal is xPb(Lu1 / 2Nb1 / 2)O3-yPb(Mg1 / 3Nb2 / 3)O3-(1-x-y)PbTiO3, wherein 0.1<=x<=0.4, 0.2<=y<=0.6, but 1-x-y is not equal to 0. The PLMNT monocrystal is prepared by a crucible descent method. The invention effectively overcomes the defect of overlow Curie temperature in the PMNT monocrystal and the defects of difficulties in crystallization and mass growth in the PLNT monocrystal in the prior art. The PLMNT monocrystal disclosed by the invention has great application potential at room temperature, is very applicable to high-temperature devices, has wide application temperature range, and can completely satisfy the application requirements in high technologies, such as ultrasonic imaging, ultrasonic motors and the like, thereby having very wide application prospects.

Description

technical field [0001] The invention relates to a relaxor ferroelectric single crystal and a preparation method thereof, in particular to a relaxor ferroelectric single crystal of a lead niobate-lutetate-lead magnesium niobate-lead titanate ternary system and a preparation method thereof. It belongs to the technical field of ferroelectric / piezoelectric materials. Background technique [0002] Due to their excellent electromechanical conversion function and fast response speed, ferroelectric / piezoelectric materials are widely used in various functional devices and play an irreplaceable important role in national economy and national defense security. Therefore, research on the preparation, piezoelectric properties and applications of relaxor ferroelectric single crystals has become a hot spot in ferroelectric materials. [0003] With Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 (PMNT) single crystal, represented by a relaxor ferroelectric solid solution single crystal with a composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B11/00
Inventor 陈建伟罗豪甦李晓兵赵祥永徐海清王升王西安林迪任博狄文宁
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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