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| Home > Publications database > Single Crystal Diffraction Studies on Energy Storage Materials with Hot Neutrons on HEiDi |
| Conference Presentation (After Call) | FZJ-2024-05288 |
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2024
Abstract: The single crystal diffractometer HEiDi (jointly operated by RWTH Aachen University and the Forschungszentrum Jülich) at the research neutron source FRM II at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching offers a broad spectrum of thermal and hot neutrons, high neutron flux, high resolution and a large access to reciprocal space, low absorption and high sensitivity for light elements. Especially its last features makes HEiDi a valuable tool for extended studies on different materials and components relevant for applications in the field of energy research. Lithium is one of the most important ingredients of nowadays batteries. Further improvements depend on better components, e.g. those that offer higher energy densities and higher operational reliability. Solid-state electrolytes, based on the cubic garnet Li$_6$La$_3$ZrTaO$_{12}$ (LLZTO), are potential candidates and have become the focus of research recently. A comprehensive T dependent study using single crystal neutron and x-ray diffraction technique (2.5 K ≤ T ≤ 873 K) delivers new insights in the mobility and pathways of the Li ions in this complex structure [1, 2, 3].Another important example are oxygen diffusion pathways in various brownmillerites, like Nd$_2$NiO$_{4+\delta}$ or Pr$_2$NiO$_{4+\delta}$ [4]. The introduction of interstitial oxygen affects not only the electric and structural properties but also the magnetic ones of these compounds. Within a joint French-German project (DFG funding ME 3488/2-1), a special mirror furnace –built at the FRM II –allowed detailed studies on the oxygen behavior up to 1300 K and in various sample atmospheres with different oxygen concentrations and pressures. Other neutron studies studies were performed down to ~2.5K inorder to get insights into the relationship between (weak) oxygen doping and magnetic order [5, 6] These experiments were combined with elastic and inelastic synchrotron radiation to gain a complete overview of the oxygen (dis)orders and phase transitions.[1] G.J. Redhammer, M. Meven, S. Ganschow, G. Tippelt and D. Rettenwander; Acta Cryst. B 77(2021), 123-130; https://doi.org/10.1107/S2052520620016145[2] G.J. Redhammer, P. Badami, M. Meven, S. Ganschow, S. Berendts, G. Tippelt, and D. Rettenwander; ACS Appl. Mater. Interfaces (2021), 350–359; https://doi.org/10.1021/acsami.0c16016[3] M. Philipp, B. Gadermaier, P. Posch, I. Hanzu, S. Ganschow, M. Meven, D. Rettenwander, G.J. Redhammer, H. Martin R. Wilkening; Adv. Mater. Interfaces 7 (2020), 200450; https://doi.org/10.1002/admi.202000450[4] C. Hareesh, M. Ceretti, P. Papet, A. Bosak, M. Meven and W. Paulus; Crystals 13(12), 1670; https://doi.org/10.3390/cryst13121670[5] S.R. Maity, M. Ceretti, L. Keller, J. Schefer, M. Meven, E. Pomjakushina, and W. Paulus; Phys. Rev. Materials 5 (2021), 014401; https://doi.org/10.1103/PhysRevMaterials.5.014401[6] S.R. Maity, M. Ceretti, L. Keller, J. Schefer, T. Shang, E. Pomjakushina, M. Meven, D. Sheptyakov, A. Cervellino and W. Paulus; Phys. Rev. Materials 3 (2019), 083604; https://doi.org/10.1103/PhysRevMaterials.3.083604
Keyword(s): Energy (1st) ; Chemical Reactions and Advanced Materials (1st) ; Condensed Matter Physics (2nd) ; Chemistry (2nd) ; Crystallography (2nd)
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