Preparation of textured piezoelectric ceramic using (001) oriented sheet-like SrBi4Ti4O15 as template material

A piezoelectric ceramic, textured technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of technical difficulties in single crystal growth and the performance of single crystals, etc. Achieve the effect of high voltage electric constant and high degree of orientation

Inactive Publication Date: 2005-09-21
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although PMN-PT single crystal has good performance, its development is limited in terms of large size, doping modification and price due to the difficulty of single crystal growth technology; while the traditional PMN-PT polycrystalline ceramics has a simple synthesis process, However, due to the random arrangement of grains in polycrystalline ceramics, the anisotropy of the grains tends to be averaged on the whole, and the performance cancels out and is far from the standard of single crystals.

Method used

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  • Preparation of textured piezoelectric ceramic using (001) oriented sheet-like SrBi4Ti4O15 as template material
  • Preparation of textured piezoelectric ceramic using (001) oriented sheet-like SrBi4Ti4O15 as template material

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Experimental program
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Effect test

Embodiment 1

[0027] Bi with a purity greater than 99% 2 o 3 、TiO 2 and SrCO 3 as the starting reactant, according to Bi 2 o 3 :TiO 2 : SrCO 3 The chemical ratio of =2.2: 4: 1 is carried out batching; The starting reactant that prepares is mixed ball milling 6 hours, then adds flux NaCl, the ratio of the quality of flux and the total mass of starting reactant is 2.0: 1, then The second mixing ball milling is 6 hours; the dispersant of the two mixing ball milling is absolute ethanol; the material after the second ball milling is dried in the air at 80°C, and the dried material is heat-treated at 950°C for 6 hours , the material after heat treatment was repeatedly washed with hot deionized water until the AgNO 3 Chloride ions cannot be detected, that is, (001)-oriented sheet-like SrBi is obtained 4 Ti 4 o 15 template material.

Embodiment 2

[0029] Bi with a purity greater than 99% 2 o 3 、TiO 2 and SrCO 3 as the starting reactant, according to Bi 2 o 3 :TiO 2 : SrCO 3 The chemical ratio of =2.2: 4: 1 is carried out batching; The initial reactant that prepares is mixed ball milling 8 hours, then adds flux KCl, the ratio of the quality of flux and initial reactant total mass is 1: 1, then The second mixed ball milling is 8 hours; the dispersant of the two mixed ball mills is absolute ethanol; the material after the second ball milling is dried in the air at 70°C, and the dried material is heat-treated at 1000°C for 2 hours , the material after heat treatment was repeatedly washed with hot deionized water until the AgNO 3 Chloride ions cannot be detected, that is, (001)-oriented sheet-like SrBi is obtained 4 Ti 4 o 15 Template material, SrBi 4 Ti 4 o 15 SEM photos of template samples at different magnifications are shown in figure 1 .

Embodiment 3

[0031] Bi with a purity greater than 99% 2 o 3 、TiO 2 and SrCO 3 as the starting reactant, according to Bi 2 o 3 :TiO 2 : SrCO 3 = 2.2: 4: 1 chemical ratio for batching; the prepared starting reactants were mixed and ball milled for 12 hours, and then the combination of flux NaCl and KCl was added, the ratio of the mass of flux to the total mass of starting reactants 0.5:1, then the second mixed ball mill for 12 hours; the dispersant of the two mixed ball mills is absolute ethanol; the material after the second ball mill is dried in the air at 80 ° C, and the dried material is in the Heat treatment at 1050°C for 6 hours, and the material after heat treatment was washed repeatedly with hot deionized water until the AgNO 3 Chloride ions cannot be detected, that is, (001)-oriented sheet-like SrBi is obtained 4 Ti 4 o 15 template material.

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Abstract

Disclosed is a method for preparing texture piezoelectric ceramic film wherein the major chemical composition of the ceramics is Pb(Mg1/3Nb2/3)O3-xPbTiO3, x=0.429-0.538, containing 3-20 wt% (001) oriented sheet-like SrBi4Ti4O15 formwork material, and having the shape of (001) oriented sheet-like SrBi4Ti4O15. The preparation process comprises charging Pb(Mg1/3Nb2/3)O3-xPbTiO3 powder into the mixed solvent of anhydrous alcohol and methyl ethyl ketone, charging dispersing agent simultaneously, mixing and ball milling, then charging SrBi4Ti4O15 formwork material, charging binding agent and plasticizing agent simultaneously, mixing and ball milling again, de-soaking the obtained slurry and doctor-blade casting, drying, laminating and press forming, subjecting the samples to isostatic cool pressing and plastic-discharging at elevated temperature, immersing in polyvinyl alcohol aqueous solution and pressurizing again, thermally pressing and sintering at the presence of argon atmosphere, and sintering in the atmosphere of air atmosphere, the prepared textured piezo-electric ceramics has higher piezoelectric constant.

Description

technical field [0001] The invention relates to a textured piezoelectric ceramic and a preparation method thereof, in particular to a sheet-like SrBi with (001) orientation 4 Ti 4 o 15 Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 Base-textured piezoelectric ceramics and a preparation method thereof. Background technique [0002] Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 (PMN)-based ceramics are typical relaxor ferroelectric materials, and when PbTiO is introduced 3 (PT) After forming the PMN-PT binary system, its Curie temperature can be significantly increased, and it is widely used in micro-displacers, brakes, smart materials and devices, etc. Although PMN-PT single crystal has good performance, its development is limited in terms of large size, doping modification and price due to the difficulty of single crystal growth technology; while the traditional PMN-PT polycrystalline ceramics has a simple synthesis process, However, due to the random arrangement of crystal grains in polycryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/472C04B35/622H01L41/187
Inventor 曹明贺刘韩星李东亮郝华王力强
Owner WUHAN UNIV OF TECH
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