Time-resolved studies of ferroelectric materials using Neutron Stroboscopic techniques during the application of electric fields
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Date
2006-12-05
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Australian Institute of Physics
Abstract
An experimental facility utilising stroboscopic methods has been developed at the Australian Nuclear Science and Technology Organisation and has been applied to study the time dependence of neutron Bragg peak intensities, in response to applied high-voltage electric fields. One advantage of such methods is that relatively small changes in scattering intensity which may occur in materials as the result of the application of a stimulus such as electric field, can be enhanced. The present stroboscopic facility with a timing resolution below 20μs, has been applied to study the variation of Bragg peak intenstities from ferroelectric materials such as triglycine sulphate (TGS), a common pyroelectric detector material, and lead zirconate titanate (PZT), the most widely used material for electromechanical transducer applications. The results obtained show the first insight into the real-time structural response of these materials during dynamic electrical loading. Single crystal TGS shows very interesting structural behaviour in the first two hundred microseconds of switching of field intensity, which is apparent in large relaxation effects in the diffracted intensity of particular hkl reflections. For the ceramic PZT, both intrinsic (lattice strains) and extrinsic (domain wall motion) contributions to the macroscopic strain have been identified from the measurement of changes in Bragg peak intensities, for the first time, during dynamic actuation.
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Keywords
Ferroelectric materials, Neutrons, Electric fields, ANSTO, Bragg curve, Scattering, Materials, PZT, Transducers, Crystal lattices
Citation
Daniels, J., Finlayson, T., Studer, A., & Jones, J. (2006). Time-resolved studies of ferroelectric materials using Neutron Stroboscopic techniques during the application of electric fields. Poster presented at the Australian Institute of Physics 17th National Congress 2006, Brisbane Convention and Exhibition Centre, Brisbane Australia, Sunday 3 - Friday 8 December 2006. Retrieved from: https://www.aip.org.au/resources/Documents/Congress/AIPCongress-2006-Program.pdf