Laboratory for Electron Microscopy

Microscopy of Nanoscale Structures & Mechanisms

Hello and welcome

at the homepage of the Microscopy of Nanoscale Structures & Mechanisms (MNM) group, where we apply and develop cutting edge analytical electron microscopy techniques to characterize and understand the evolution of nano- and microstructures of advanced materials.


Welcome Dr.-Ing. C. Dolle!

We are pleased to welcome Dr.-Ing. Christian Dolle to the MNM team. He will strengthen us in our research activities on electron beam sensitive materials in the area of the ​​3DMM2O research. We are looking forward to the collaboration.

Welcome Q. Sun!

We look forward to welcoming Ms. Qing Sun to the MNM team. She started her PhD on January 1st, 2021 and will study electron beam sensitive SURMOFs materials. We wish her every success.

Situ Halter NEWS
New in situ TEM Halter

The new in situ TEM holder has arrived and we are excited to perform first experiments.

Christophe Lopes NEWS
Welcome C. Lopes!

We look forward to welcoming Mr. Christophe Lopes as a new member of our team from November 1st. We wish him every success with his master's thesis.

Welcome Z. Long!

We look forward to welcoming Ms. Zhongmin Long as a support in our team from November 1st! She is interested deformation mechanisms of Superalloys. We wish her every success with her doctoral thesis.

MNM Team


Prof. Dr.-Ing. Yolita M. Eggeler




       Dr.-Ing. Christian Dolle


M.Sc. Qing Sun


M.Sc. Zhongmin Long


B.Sc. Christophe Lopes

Research areas

We are curios to understand how nano- and microstructures of materials form during processing and service and how they affect structural and functional properties. We presently work on single crystal superalloys (SX), high entropy alloys (HEA), functional magnetic Heusler and half Heusler (H/hH) compounds and new small-scale nano and micro engineered systems (excellence cluster 3DMM2O) on the atomic (crystals) respectively molecular (soft matter) scale.

Electron microscopy enables us to dive in into the nano-cosmos of materials and to discover yet unknown fundamental processes and materials phenomena.

Thus, we are fascinated

  • to see how plastic deformation unfolds in microstructures of high-performance metallic materials, where we aim at understanding the role of dislocations, planar faults and solute segregation to these crystal defects.
  • to directly observe solid state reactions like phase decompositions and coarsening processes in multiphase materials on the nanoscale and to explore how these processes affect functional and structural properties.
  • to explore which nano- and microstructural configurations rationalize magnetic properties and how these can be optimized.
  • to characterize Metal Organic Frameworks (MOF), to study their synthesis and to explore possible nanoscale applications.

Our group closely collaborates with national and international research partners.

Please contact us in case you are interested to collaborate. We always welcome suggestions for collaborations and our group represents a fruitful scientific environment for postdoctoral researchers from all over the world. (applications welcome)

We are looking forward to hearing from you.

Yolita M. Eggeler, and all members of the MNM-group at LEM


Design of Nickel-Cobalt-Ruthenium multi-principal element alloys.
Charpagne, M. A.; Vamsi, K. V.; Eggeler, Y. M.; Murray, S. P.; Frey, C.; Kolli, S. K.; Pollock, T. M.
2020. Acta materialia, 194, 224–235. doi:10.1016/j.actamat.2020.05.003
Interfacial structure and strain accommodation in two-phase Nb Co Sn Heusler intermetallics.
Eggeler, Y. M.; Levin, E. E.; Wang, F.; Kitchaev, D. A.; Van der Ven, A.; Seshadri, R.; Pollock, T. M.; Gianola, D. S.
2020. Physical review materials, 4 (9), Art.-Nr.: 093601. doi:10.1103/PhysRevMaterials.4.093601
The Effect of Alloying on the Thermophysical and Mechanical Properties of Co–Ti–Cr-Based Superalloys.
Zenk, C. H.; Volz, N.; Bezold, A.; Huber, L.-K.; Eggeler, Y. M.; Spiecker, E.; Göken, M.; Neumeier, S.
2020. Superalloys 2020: Proceedings of the 14th International Symposium on Superalloys. Ed.: S. Tin, 909–919, Springer. doi:10.1007/978-3-030-51834-9_89
Using Rapid Thermal Annealing for Studying Early Stages of High-Temperature Oxidation of Superalloys.
Kubacka, D.; Eggeler, Y. M.; Volz, N.; Neumeier, S.; Spiecker, E.
2020. Superalloys 2020: Proceedings of the 14th International Symposium on Superalloys. Ed.: S. Tin, 763–770, Springer. doi:10.1007/978-3-030-51834-9_74
Tension/Compression asymmetry of a creep deformed single crystal Co-base superalloy.
Lenz, M.; Eggeler, Y. M.; Müller, J.; Zenk, C. H.; Volz, N.; Wollgramm, P.; Eggeler, G.; Neumeier, S.; Göken, M.; Spiecker, E.
2019. Acta materialia, 166, 597–610. doi:10.1016/j.actamat.2018.12.053
Characterisation of Misfit Dislocations at Semicoherent Interfaces in Biphasic Functional Heusler Intermetallics.
Eggeler, Y.; Levin, E. E.; Wang, F.; Seshadri, R.; Pollock, T. M.; Gianola, D. S.
2019. Microscopy and microanalysis, 25 (S2), 1916–1917. doi:10.1017/S1431927619010316
On the nucleation of planar faults during low temperature and high stress creep of single crystal Ni-base superalloys.
Wu, X.; Dlouhy, A.; Eggeler, Y. M.; Spiecker, E.; Kostka, A.; Somsen, C.; Eggeler, G.
2018. Acta materialia, 144, 642–655. doi:10.1016/j.actamat.2017.09.063
Identification of a ternary -phase in the Co-Ti-W system – An advanced correlative thin-film and bulk combinatorial materials investigation.
Naujoks, D.; Eggeler, Y. M.; Hallensleben, P.; Frenzel, J.; Fries, S. G.; Palumbo, M.; Koßmann, J.; Hammerschmidt, T.; Pfetzing-Micklich, J.; Eggeler, G.; Spiecker, E.; Drautz, R.; Ludwig, A.
2017. Acta materialia, 138, 100–110. doi:10.1016/j.actamat.2017.07.037
Combining advanced TEM techniques for full characterization of extended defects in creep-deformed single crystal superalloys.
Spiecker, E.; Müller, J.; Eggeler, Y. M.; Lenz, M.
2016. European Microscopy Congress 2016: Proceedings, 780–781, Wiley-VCH Verlag. doi:10.1002/9783527808465.EMC2016.8697
Analysing the tension/compression asymmetry in creep deformed Co-base superalloys using electron microscopy.
Lenz, M.; Eggeler, Y.; Schweizer, P.; Zenk, C.; Neumeier, S.; Göken, M.; Wollgramm, P.; Eggeler, G.; Spiecker, E.
2016. European Microscopy Congress 2016: Proceedings, 221–222, Wiley-VCH Verlag. doi:10.1002/9783527808465.EMC2016.6787
Planar defect formation in the ′ phase during high temperature creep in single crystal CoNi-base superalloys.
Eggeler, Y. M.; Müller, J.; Titus, M. S.; Suzuki, A.; Pollock, T. M.; Spiecker, E.
2016. Acta materialia, 113, 335–349. doi:10.1016/j.actamat.2016.03.077