For transmission electron microscopy (TEM) a Tecnai F30-G2 with Super-Twin lens is available, which combines a rather high resolving power (point resolution: 0.2 nm), large tilt angles (for crystallography applications) as well as analytical options (EELS, EFTEM, HAADF-STEM, EDXS). The investigation of air-sensitive substances is made possible. Current research projects comprise the real-structure characterisation and nano-analysis of germanium and silicon clathrates, the formation of super-structure in Delafossites as Cu3Ni2SbO6 and order-disorder phenomena in boron carbide B13C2.
![Applications of TEM to complex inorganic compounds.a) High-resolution TEM image in [100] orientation, b) EEL spectrum and c) EDX spectrum of the borosilicide K7B7Si39 with clathrate-I structure [Jung et. al, Angew. Chemie 119, 6846 (2007)]. d) HAADF-STEM image in [100] orientation of the complex inter-metallic phase RhAl2.63. (Images: Dr. R. Ramlau)](/2871474/original-1518441241.jpg?t=eyJ3aWR0aCI6ODQ4LCJmaWxlX2V4dGVuc2lvbiI6ImpwZyIsIm9ial9pZCI6Mjg3MTQ3NH0%3D--c702ecec901ac6685fd9f86533a7c9431a35b78c "Applications of TEM to complex inorganic compounds.a) High-resolution TEM image in [100] orientation, b) EEL spectrum and c) EDX spectrum of the borosilicide K7B7Si39 with clathrate-I structure [Jung et. al, Angew. Chemie 119, 6846 (2007)]. d) HAADF-STEM image in [100] orientation of the complex inter-metallic phase RhAl2.63. (Images: Dr. R. Ramlau)")
![Applications of TEM to complex inorganic compounds.a) High-resolution TEM image in [100] orientation, b) EEL spectrum and c) EDX spectrum of the borosilicide K7B7Si39 with clathrate-I structure [Jung et. al, Angew. Chemie 119, 6846 (2007)]. d) HAADF-STEM image in [100] orientation of the complex inter-metallic phase RhAl2.63. (Images: Dr. R. Ramlau)](/2871474/original-1518441241.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjI4NzE0NzR9--aa593358bf08cd41b58c8ebe1e0353d6cadfd1e7)
a) High-resolution TEM image in [100] orientation, b) EEL spectrum and c) EDX spectrum of the borosilicide K7B7Si39 with clathrate-I structure [Jung et. al, Angew. Chemie 119, 6846 (2007)]. d) HAADF-STEM image in [100] orientation of the complex inter-metallic phase RhAl2.63. (Images: Dr. R. Ramlau)
Additionally, a transmission electron microscope Tecnai 10 is available with high-contrast lens and an attachment for precession electron diffraction (PED). The intensities of reflections taken from PED, which are kinematical in a good approximation, allow a structure refinement in analogy to x-ray structure refinement. The unbeatable advantage of electron crystallography lies in its applicability to the smallest specimen volumes, e.g. complex inter-metallic phases in heterogeneous textures.