Atom probe tomography of lithium-doped network glasses

作者：Greiwe Gerd Hendrik^*; Balogh Zoltan; Schmitz Guido

来源：Ultramicroscopy, 2014, 141: 51-55.

DOI：10.1016/j.ultramic.2014.03.007

• Atom probe tomography
• Laser-assisted field evaporation
• Dielectric materials
• Band bending
• Ionic transport

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 held 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.

• 出版日期2014-6