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High Performance Piezoelectric Thin Films for Shape Control in Large Inflatable StructuresThe objective of this research and development program was to develop PbZr(1-x)Ti(x)O3 (PZT) and Pb(1-x)Ba(x)Nb2O6 (PBN) materials with large piezoelectric response which are suitable for shape control in large inflatable structures. Two approaches were to be considered: (1) direct deposition of PZT and PBN films on flexible plastic or thin metal foil substrates, and (2) deposition on Si followed by fabrication of hybrid structures on mylar or kapton. Testing in shape control concepts was carried out at JPL and based on their results, the required modifications were made in the final film compositions and deposition techniques. The program objective was to identify and then optimize piezoelectric materials for NASA shape control applications. This involved the bulk piezoelectric and photovoltaic responses and the compatibility of the thin films with appropriate substrate structures. Within the PZT system, Rockwell has achieved the highest reported piezoelectric coefficient (d(sub 33) greater than 100 pC/N) of any ceramic composition. We used this experience in piezoelectric technology to establish compositions that can effectively address the issues of this program. The performance of piezoelectric thin films depends directly on d(sub ij) and Epsilon. The challenge was to find PZT compositions that maintained high d(sub ij) and Epsilon, while also exhibiting a large photovoltaic effect and integrate thin films of this composition into the system structure necessary to meet shape control applications. During the course of this program, several PZT and PLZT compositions were identified that meet these requirements. Two such compositions were successfully used in electrical and optical actuation studies of thin film structures.
Document ID
19990021013
Document Type
Contractor or Grantee Report
Authors
Neurgaonkar, R. R.
(Rockwell International Corp. Thousand Oaks, CA United States)
Nelson, J. G.
(Rockwell International Corp. Thousand Oaks, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Nonmetallic Materials
Report/Patent Number
SC44809.FR
Funding Number(s)
CONTRACT_GRANT: NCC7-6
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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