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Novel barium stannate-lead ferroelectric and piezoelectic ceramic, and preparation thereof

A technology of barium stannate and lead titanate, applied in the field of ferroelectric ceramics, can solve the problems of easy depolarization and limited application, and achieve the effects of low cost, controllable components and high chemical purity

Inactive Publication Date: 2009-03-04
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 and Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 have excellent piezoelectric properties, but their Curie points are at 140-170°C, and there is a trigonal-tetragonal phase transition at lower temperatures (60-90°C), which makes them easy to depolarize, limiting their Applications in many fields

Method used

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  • Novel barium stannate-lead ferroelectric and piezoelectic ceramic, and preparation thereof
  • Novel barium stannate-lead ferroelectric and piezoelectic ceramic, and preparation thereof
  • Novel barium stannate-lead ferroelectric and piezoelectic ceramic, and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Synthesis of 0.45BaSnO by a two-step synthesis method 3 -0.55PbTO 3

[0017] In the first step, the initial raw material BaCO 3 , SnO 2 , PbO, TiO 2 Press BaSnO 3 And PbTO 3 The content of the chemical formula is weighed, and after mixing, grinding, drying and other processes, they are respectively calcined at 1000℃ (2-4 hours) to pre-synthesize BaSnO 3 And PbTO 3 raw material. The second step is to press the above raw materials into 0.45BaSnO 3 -0.55PbTO 3 The formula requires weighing, mixing, grinding, drying, and molding (add proper amount of binder such as distilled water, 5-10% polyvinyl alcohol solution), molding pressure 5-10MPa, and then sintering (heat preservation for 4 hours), This is the ferroelectric ceramic developed by the present invention. By measuring the dielectric properties of the component ceramics, it is found that it has a strong dielectric relaxation phenomenon, and has a large dielectric constant (7800) at room temperature.

Embodiment 2

[0018] Example 2: Synthesis of 0.40BaSnO by solid phase synthesis 3 -0.60PbTO 3 .

[0019] The initial raw material BaCO 3 , SnO 2 , PbO, TiO 2 Press BaSnO 3 And PbTO 3 The content of the chemical formula is weighed, after mixing, grinding, drying, and molding, the molding pressure is 5MPa, and then the temperature is kept at 800-1000℃ for 3 hours. After solid-phase reaction, 0.40BaSnO with perovskite phase structure is obtained. 3 -0.60PbTO 3 Compound, the product is re-pulverized, ground, dried, molded, and then heated to 1200-1300°C for sintering (holding for 3 hours), which is the ferroelectric ceramic developed by the invention. Through the measurement of the dielectric and piezoelectric properties of the component ceramics, the Curie point of the component ceramics is 120℃, and the piezoelectric constant d 33 It is 320pC / N.

Embodiment 3

[0020] Example 3: Synthesis of 0.35BaSnO by solid phase synthesis 3 -0.65PbTO 3 .

[0021] The initial raw material BaCO 3 , SnO 2 , PbO, TiO 2 Press BaSnO 3 And PbTO 3 The content of the chemical formula is weighed, after mixing, grinding, drying, and molding, the molding pressure is 3MPa, and then the temperature is kept at 800-1000℃ for 2 hours. After solid-phase reaction, 0.35BaSnO with perovskite phase structure is obtained. 3 -0.65PbTO 3 Compound, the product is pulverized, ground, dried, molded, and then heated to 1200-1300°C for sintering (heat preservation for 4 hours), which is the ferroelectric ceramic developed by the present invention. By measuring the dielectric and piezoelectric properties of the component ceramics, the Curie point of the component ceramics is 180℃, and the piezoelectric constant d 33 It is 220pC / N.

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Abstract

The invention relates to novel barium stannate-lead titanate ferroelectric piezoelectric ceramics and a preparation method thereof, which belongs to the field of the ferroelectric piezoelectric ceramics. The ceramics is provided with a perofskite type structure, the chemical composition is (1-x)BaSnO3-xPbTiO3(x is larger than 0 and smaller than 1), and the range x of the morphotropic phase boundary (MPB) of the solid solution ceramic system is larger than or equal to 0.61 and smaller than or equal to 0.66. The ceramics is synthesized by the two-step synthesis method or the solid phase synthesis method. At room temperature, the Curie point of the material near the MPB is 140-200 DEG C, and the material has high piezoelectric constant d33(200-350pC / N), high electromechanical coupling factor kp (50-65 percent) and large deformation S(0.1-0.5 percent). The preparation technique is simple, and the cost is low; the product of the material has the advantages of high chemistry purity, good uniformity and controllable components.

Description

Technical field [0001] The invention belongs to the field of ferroelectric ceramics. Background technique [0002] Because relaxed ferroelectrics have the characteristics of high dielectric constant and large electric strain, relaxed ferroelectric ceramic materials have become a research hotspot, because they usually have high dielectric near the dielectric dispersion peak. Capacitance, and has excellent piezoelectric characteristics, such as Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 , Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 And other solid solutions. Piezoelectric materials containing ferroelectric ceramic materials are widely used in piezoelectric filters, piezoelectric transducers, ultrasonic oscillators and piezoelectric buzzers. The most typical ferroelectric material that has been put into application is PbTiO 3 -PbZrO 3 Series solid solutions and Pb(Mg1 / 2Nb2 / 3)O3-PbTiO3-PbZrO3 series solid solutions (Japanese Patent Publication 42-9716), etc. On the other hand, people have recently studied th...

Claims

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Application Information

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IPC IPC(8): C04B35/457C04B35/462H01L41/187
Inventor 龙西法王国建
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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