| EPSRC Reference: |
GR/R42559/01 |
| Title: |
Growth of Piezoelectric Complex-Perovskite Single Crystals |
| Principal Investigator: |
Bell, Professor AJ |
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| Project Partners: |
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| Department: |
Institute of Materials Research |
| Organisation: |
University of Leeds |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 September 2001 |
Ends: |
31 August 2003 |
Value (£): |
194,227
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
Materials Processing |
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Summary on Grant Application Form |
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It has been demonstrated that single crystal complex perovskites, such as Pb(Mg1/3Nb2/3)03-PbTi03, possess piezoelectric coefficients 5 times greater than commercial PZT ceramics and which develop an order of magnitude greater strain. The implications of the commercial exploitation of such crystals are enormous for all suppliers and users of piezoelectric materials and devices. A prerequisite for exploitation will be the availability of large, single-phase crystals with controlled defect concentrations and methods of device fabrication optimised to single crystals. Accurate piezoelectric, dielectric and elastic coefficient data sets are required to facilitate modelling of devices based on the new materials. Progress towards exploitation is impeded by the lack of large, high quality crystals.In this programme we intend to grow crystals, with optimum defect concentrations, up to 50 mm in diameter and 100 mm in length by a modified Bridgman method from PbO flux. The use of a 24 zone furnace will allow unprecedented control over PbO evaporation and PbTi03 segregation. The defect structures, the piezoelectric and dielectric characteristics of the crystals will be measured to provide feedback to the iterative growth programme and to input to the finite element aided design of piezoelectric devices from the new materials. Device processing methods will be developed to allow the fabrication of actuators and ultrasonic transducers of optimised design.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.leeds.ac.uk |