Atom probe tomography of lithium-doped network glasses.
Li-doped silicate and borate glasses are electronically insulating, but provide considerable ionic conductivity. Under measurement conditions of laser-assisted atom probe tomography, mobile Li ions are redistributed in response to high electric fields. In consequence, the direct interpretation of measured composition profiles is prevented. It is demonstrated that composition profiles are nevertheless well understood by a complex model taking into account the electronic structure of dielectric materials, ionic mobility and field screening. Quantitative data on band bending and field penetration during measurement are derived which are important in understanding laser-assisted atom probe tomography of dielectric materials.
Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany. Electronic address: g_grei01@uni-muenster.de.
Gerd-Hendrik
GH
Greiwe
Institute of Material Science, University of Stuttgart, Heisenberg Straße 3, D-70569 Stuttgart, Germany.
Zoltan
Z
Balogh
Institute of Material Science, University of Stuttgart, Heisenberg Straße 3, D-70569 Stuttgart, Germany.
Guido
G
Schmitz
Atom probe tomography; Band bending; Dielectric materials; Ionic transport; Laser-assisted field evaporation