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Optimization of Relaxor Single Crystals for Bending Mode Applications

[+] Author Affiliations
T. Q. Liu, C. S. Lynch

Georgia Institute of Technology, Atlanta, GA

Paper No. IMECE2002-33995, pp. 91-96; 6 pages
doi:10.1115/IMECE2002-33995
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Adaptive Structures and Materials Systems
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-3625-8 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Rhombohedral relaxor single crystals are a class of materials that includes PZN-PT and PMN-PT in a certain range of compositions. This work presents an approach to predicting the physical properties of relaxor single crystals with an engineered domain state. A model based on properties of crystal variants and volume averaging indicates large piezoelectric coefficient d31 (690 pC/N) and d32 (−1670 pC/N) for the <110> cuts and a value over 4000 pC/N for d15 and the existence of d16 with a value as large as −2300 pC/N in <111> orientation cuts. The predictive capability of the approach results in a computational tool for the design of engineered domain states with properties optimized for specific applications. This has resulted in the identification of a crystal cut optimized for actuator and sensor applications that utilizes the transverse mode piezoelectric coupling coefficients (d31 and d32 ).

Copyright © 2002 by ASME

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