| EPSRC Reference: |
GR/T25644/01 |
| Title: |
Fermi Surface Nesting and the Shape Memory Phenomenon in Ni62AI38: Travel to Support a Compton Scattering Study at SPring-8, Japan |
| Principal Investigator: |
Dugdale, Professor S |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Physics |
| Organisation: |
University of Bristol |
| Scheme: |
Overseas Travel Grants Pre-FEC |
| Starts: |
01 July 2004 |
Ends: |
30 September 2004 |
Value (£): |
2,500
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| EPSRC Research Topic Classifications: |
| Condensed Matter Physics |
Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| No relevance to Underpinning Sectors |
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| Panel History: |
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Summary on Grant Application Form |
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Shape-memory alloys have been used in various technologies for over thirty years. Shape-memory and superelasticity are a consequence of a martensitic transformation: a displacive, diffusionless structural phase transition. Despite the successful application of shape-memory, a full microscopic understanding of the origins of this phase transition is yet to be achieved. Much theoretical and experimental effort has focused on premartensitic phenomena of several alloys, that occur as the martensitic transition temperature is approached from above. This is manifest as phonon softening that is progressive with decreasing temperature. For a number of alloys, such as Ni-Al, Ni-Ti and Ni2MnGa, a proposed cause of this is strong electron-phonon coupling and a strongly nested Fermi surface. In spite of much theoretical speculation surrounding the identification of specific nesting features in calculated Fermi surfaces and associating them with phonon softening for all three of these alloys, there has as yet been no experimental verification of these features. This has principally been because of the lack of a suitable probe. The direct observation of nesting features will therefore provide vital information for the understanding of the shape memory phenomenon. This proposal is to fund travel to Japan to make measurements of the Fermi surface of a Ni-Al alloy and relate the measured Fermi surface to the shape memory phenomenon.We have already secured peer-reviewed beamtime on BL08W (Spring-8) to carry out this research during the first week of July 2004.
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Key Findings |
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Potential use in non-academic contexts |
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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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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.bris.ac.uk |