Expanded Operating Domain Piezoelectric Single Crystals

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$1,487,867.00
Award Year:
2007
Program:
STTR
Phase:
Phase II
Contract:
N00014-07-C-0858
Award Id:
77924
Agency Tracking Number:
N064-034-0154
Solicitation Year:
2006
Solicitation Topic Code:
N06-T034
Solicitation Number:
2006.
Small Business Information
2820 East College Avenue, State College, PA, 16801-6801
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
782683007
Principal Investigator:
JunLuo
Research scientist
(814) 238-7485
jun@trstechnologies.com
Business Contact:
WesleyHackenberge
President
(814) 238-7485
wes@trstechnologies.com
Research Institute:
MRI AT PENN STATE UNIV.
Shujun Zhang
259 Materials Research Lab
University Park, PA, 16802-
(814) 863-2639

Abstract
Single crystal relaxor ferroelectrics, PMN-PT, have shown great promise for broad bandwidth sonar transducers. However, the benefits of PMN-PT are somewhat counterbalanced by its maximum temperature limitation (~80 to 95 degrees C), low coercive field (~2kV/cm) and low mechanical quality factor (60-80) for compact, high power and high duty cycle applications. The new crystal compositions with expanded operating temperature ranges are highly desired for such applications. The Phase I results suggest that PMN-PT can stabilize the perovskite phase of the crystal melt when it consists of high temperature capable binary compounds. The resulting PMN-PT based ternary compounds have significantly increased phase transition temperature and coercive field and growth conditions very similar to pure PMN-PT. In phase II, TRS proposes to grow large-size, PMN-PT-based ternary relaxor piezoelectric crystals with optimized compositions to further expand operating temperature ranges. By applying the well-established Bridgman process, not only will the cost and time for developing these new materials be dramatically reduced, but also the manufacturability of these materials will be insured. The goal is to elevate phase transition temperature to 125oC -150 oC, coercive field to 5kV/cm and mechanical Q to over 150.

* information listed above is at the time of submission.

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