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Piezoelectric crystal elements of shear mode and process for the preparation thereof

a technology of shear mode and crystal elements, applied in the direction of generators/motors, instruments, ultrasonic/sonic/infrasonic diagnostics, etc., can solve the problems of failure to achieve the present, failure failure of peng et al. to provide the necessary understanding and additional elements, so as to achieve super-high piezoelectric performance and optimize the shear mode piezoelectric properties

Inactive Publication Date: 2006-01-19
H C MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] The present invention relates to Piezoelectric crystal elements having preferred cut directions that optimize the shear mode piezoelectric properties. In the discovered cut directions, the crystal elements have super-high piezoelectric performance with d15, d24 and d36 shear modes at room temperature. The d15 shear mode crystal gives a maximum d value and is free from the cross-talk of d11 and d16. The d36 mode is extremely reliable compared to other shear elements due to its ready re-poling capability. The crystal elements may be beneficially used for high-sensitive acoustic transducers.

Problems solved by technology

The improved “high” piezoelectric properties noted in this literature promised a new application of acoustic transduction devices using the longitudinal extension mode (d33 or compression mode) but failed to achieve the present results.
Peng et al. fails to provide the necessary understanding and additional elements to prevent cross talk and improve reliability.

Method used

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  • Piezoelectric crystal elements of shear mode and process for the preparation thereof
  • Piezoelectric crystal elements of shear mode and process for the preparation thereof
  • Piezoelectric crystal elements of shear mode and process for the preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment 1

[0069] A plate crystal element, similar to that shown in FIG. 5, was created and measured data of d15 as high as 6,000 pC / N, and d16 less than 100 pC / N, and d11 less than 90 pC / N.

experiment 2

[0070] A plate crystal element, constructed as shown in FIG. 6, was measured and provided measured data of d36 as high as 2,000 pC / N and d34 / d35 less than 50 pC / N. The d36 shear mode crystal elements was easily be re-poled, if any de-poling occurred or was necessary.

experiment 3

[0071] The plate crystal element as FIG. 2, was provided wherein the rotation angle theta was taken from 0 to 330° in increments of 30°. The measured data of d15 are listed in Table 2.

TABLE 2Experiment data for free X-Y cut ( poling3 m) d15 shear mode crystalsTheta °0°30°60°90°120°150°d15 pC / N394037204050387041004220Theta °180°210°240°270°300°330°d15 pC / N419037884240387043013904

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Abstract

Piezoelectric crystal elements are provided having preferred cut directions that optimize the shear mode piezoelectric properties. In the discovered cut directions, the crystal elements have super-high piezoelectric performance with d15, d24 and d36 shear modes at room temperature. The d15 shear mode crystal gives a maximum d value and is free from the cross-talk of d11 and d16. The d36 mode is extremely reliable compared to other shear elements due to its ready re-poling capability. The crystal elements may be beneficially used for high-sensitive acoustic transducers.

Description

RELATED APPLICATIONS [0001] This application claims priority from U.S. Provisional Application Ser. No. 60 / 598,885, filed Jul. 14, 2004, the contents of which are fully incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to the piezoelectric crystal elements of shear mode and the process for the preparation thereof. The single crystals can be PMN-PT (Lead Magnesium Niobate-Lead Titanate), PZMN-PT (doped PMN-PT), or related piezoceramic materials. More particularly, the present invention relates to the discoveries of the new cut directions that optimize the shear mode piezoelectric properties. In the discovered cut directions, the PMN-PT crystal elements and related compositions have super-high piezoelectric performance with d15, d24 and d36 share mode at room temperature. Even more particularly, the present invention relates to a d15 shear mode crystal that gives the maximum d value and is free from the cross-ta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L41/187H10N30/01H10N30/20H10N30/045H10N30/80H10N30/06H10N30/853H10N30/088H10N30/30H10N30/85
CPCH01L41/0906H01L41/1875Y10T29/42H01L41/338Y10T29/49155H01L41/257Y10T29/49005H10N30/208H10N30/85H10N30/045H10N30/088G01C19/5607H10N30/06H10N30/206H10N30/302H10N30/852H10N30/8548H10N30/8554H10N30/202A61B8/4494
Inventor HAN, PENGDI
Owner H C MATERIALS CORP
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