Document Detail

Piezoelectric composites with high sensitivity and high capacitance for use at high pressures.
MedLine Citation:
PMID:  18267628     Owner:  NLM     Status:  In-Data-Review    
A type of piezoelectric composite has been developed for oceanographic applications. The composites have a large figure of merit (d(h)xg(h) or d(h )xg(h)/tan delta, where d(h ) is the hydrostatic piezoelectric voltage coefficient), a large dielectric constant (K) and low dielectric loss, and great mechanical strength. A shallow cavity between the PZT ceramics and thick metallic electrode is designed to convert a portion of the z-direction stress into a large radial and tangential stress of opposite sign. thereby causing the d(33) and d(31) contributions to d(h) to add rather than subtract, and raising the figure of merit. Theoretical stress analysis was carried out using an axisymmetric finite element method. Experimental results show that the d(h)x g(h), K, and withstandable pressure are extremely high.
Q C Xu; S Yoshikawa; J R Belsick; R E Newnham
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  IEEE transactions on ultrasonics, ferroelectrics, and frequency control     Volume:  38     ISSN:  0885-3010     ISO Abbreviation:  IEEE Trans Ultrason Ferroelectr Freq Control     Publication Date:  1991  
Date Detail:
Created Date:  2008-02-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882735     Medline TA:  IEEE Trans Ultrason Ferroelectr Freq Control     Country:  United States    
Other Details:
Languages:  eng     Pagination:  634-9     Citation Subset:  -    
Mater. Res. Lab., Pennsylvania State Univ., University Park, PA.
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