Surface resonance states on Pd(110) / X-‐ray micro tomography -‐ A case study of LiFePO4 samples
by
Peter Amann(Chemical Physics Department)
→
Europe/Stockholm
FD 41
FD 41
Description
In this talk I will give a survey of what I did before I came to the University of Stockholm. The
talk will be split into two parts.
In part i.) I will focus on the surface of clean and hydrogen-covered Pd(110), which was
investigated by angle-resolved photoemission spectroscopy. For both surfaces, a lowdimensional
Tamm-type surface resonance is found around the Fermi-energy (EF) at S-bar.
Interestingly, upon 1.5 ML Hydrogen adsorption the pairing-row reconstruction on Pd(110)
develops together with a satellite peak of the S-bar resonance. The band dispersion of this
satellite is parallel to the dispersion of the main resonance, but shifted to lower energies by
roughly 400meV at 100K. The results put the question up if this is related to a paramagneticferromagnetic
transition. Bulk Pd is known to be nearly ferromagnetic. Surface-states or
resonances are very sensitive to the local magnetic order at the surface and act as a surface
localized magnetometer.
In part ii.) I will present the method of X-ray micro tomography and discuss LiFePO4 electrode
materials in more detail. By combining LiFePO4 with 3D embroidered technologies, higher
energy- and power densities are expected. X-ray micro tomography is used to study the 3D
geometry, verify the production process and to deliver the basis for numerical simulations.
