In-situ XRD study at cryogenic temperatures

Several materials are explored in microelectronics for application such as interconnections for 3D integration or in quantum computing applications. A key parameter is the superconducting properties of materials such as Ta, Sn with a critical temperature at 3.74K. One issue is that such materials undergo phase transition. For example, Sn undergoes a pase transition at 286K (13°C), from a body centred tetragonal phase Beta-Sn, to diamond cubic one inducing a huge volume increase of 27%, resulting in cracks of matter and in transformation into powder. In the frame of this proposal, we will use the cryostat developped at BM02 to beamline to reach low temperature (6 K) to study the phase transition of such materials.