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BTS (Ba2TiSi2O8) piezoelectric crystal cut type and application thereof

A piezoelectric crystal and titanium silicate technology, which is applied in the cutting shape of titanium barium silicate piezoelectric crystal and its application fields, can solve the problems of the influence of material properties, etc., achieves large piezoelectric coefficient, high voltage electric constant, and simple processing method. Effect

Active Publication Date: 2019-02-15
山东本源晶体科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problem that the incommensurate phase transition of barium titanium silicate crystal affects the material properties at around 170°C, the present invention provides a barium titanium silicate piezoelectric crystal cut shape and its application. The cut shape not only has high Piezoelectric constant and piezoelectric constant temperature stability, and has excellent thermal expansion linearity and thermal expansion matching (matching with alumina ceramic materials), it has great application value in piezoelectric sensor devices

Method used

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  • BTS (Ba2TiSi2O8) piezoelectric crystal cut type and application thereof
  • BTS (Ba2TiSi2O8) piezoelectric crystal cut type and application thereof
  • BTS (Ba2TiSi2O8) piezoelectric crystal cut type and application thereof

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Embodiment 1

[0044] A barium titanium silicate piezoelectric crystal cut type, for the tetragonal barium titanium silicate crystal, the physical coordinate axes X, Y and Z axes are respectively parallel to the crystallographic coordinate axes a, b and c axes, and the piezoelectric coefficient of the crystal is d 33 The positive value is the +Z axis, the negative value is the -Z axis, and the Z-axis direction of the titanium barium silicate crystal is determined. The cut shape of the titanium barium silicate piezoelectric crystal is any Cutting at an angle of θ can obtain a cut shape with a high piezoelectric constant and a linear thermal expansion coefficient, which is denoted as (θ, ψ), θ=46°, ψ is any angle, and the sample cut shape and processing angle are as follows: Figure 5 shown.

[0045] Verification of barium titanosilicate piezoelectric crystal with large piezoelectric constant:

[0046] Pole figures of thermal expansion through barium titania silicate crystals in different te...

Embodiment 2

[0058] Barium titanium silicate piezoelectric crystal cut as described in Example 1, the difference is: θ=47 °, ψ is any angle, the sample cut and processing angle are as follows Figure 5 Shown; the ratio of processing cut size is length:width:thickness==3:4:5, test the change of the size in the thickness direction with temperature in the range of 25°C-500°C, and obtain the effective thermal expansion coefficient α in this direction * 33 8.0ppm / °C.

Embodiment 3

[0060] Barium titanium silicate piezoelectric crystal cut as described in Example 1, the difference is: θ=48 °, ψ is any angle, the sample cut and processing angle are as follows Figure 5 Shown; the ratio of processing cut size is length:width:thickness==3:4:5, test the change of the size in the thickness direction with temperature in the range of 25°C-500°C, and obtain the effective thermal expansion coefficient α in this direction * 33 It is 8.1ppm / °C.

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Abstract

The invention relates to a BTS (Ba2TiSi2O8) piezoelectric crystal cut type. The BTS piezoelectric crystal cut type can be obtained by cutting along the direction deviating from theta angle of the Z axis randomly and has higher piezoelectric constant and linear thermal expansion coefficient, marked (theta, psi), wherein theta is larger than or equal to 45 degrees and smaller than or equal to 50 degrees and psi is larger than or equal to minus 180 degrees and smaller than or equal to 180 degrees. The cut type has the linear thermal expansion coefficient of 8.0-8.2 ppm / DEG C and the effective piezoelectric constant d<*>33 lager than 8.5 pC / N in the range of the room temperature to 500 DEG C and has the change rate lower than 13% in the range of the room temperature to 500 DEG C. The problem of mismatching of thermal expansion in application of BTS crystals is solved, besides, the temperature stability of the piezoelectric performance is improved, and the cut type is particularly suitableto be developed into a piezoelectric sensor device used in the wide temperature range.

Description

technical field [0001] The invention relates to a barium titanium silicate piezoelectric crystal cut shape and an application thereof, belonging to the technical field of piezoelectric crystal applications. Background technique [0002] Piezoelectric vibration sensors, pressure sensors, acceleration sensors, transducers, resonators, etc. developed from high-temperature piezoelectric crystal materials have important applications in aerospace, nuclear power systems, oil exploration, and online monitoring of combustion engines. At present, a variety of high-temperature piezoelectric crystal materials have been developed, but there are still some deficiencies in their overall performance. [0003] The lithium niobate crystal has a high longitudinal piezoelectric constant (d 22 =21pC / N) and electromechanical coupling coefficient (k eff =60%), but the physical and chemical properties of the crystalline material are unstable at a high temperature of 300°C, the resistivity is sign...

Claims

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Application Information

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IPC IPC(8): C30B29/34C30B29/60
CPCC30B29/34C30B29/60
Inventor 于法鹏姜超陈菲菲程秀凤张树君赵显
Owner 山东本源晶体科技有限公司
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