Regensburg 2025 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 9: Poster

MM 9.7: Poster

Monday, March 17, 2025, 18:30–20:30, P1

Raman spectroscopic studies on NiFe₂O₄-NiO-Ni and MgO-Steel composites as inert anode materials for aluminium molten salt electrolysis — •Felix Drechsler¹, Ulziikhuu Otgonbayar², Cameliu Himcinschi¹, and Jens Kortus¹ — ¹TU Bergakademie Freiberg, Institute of Theoretical Physics, D-09599 Freiberg, Germany — ²TU Bergakademie Freiberg, Institute of Nonferrous Metallurgy and Purest Materials, D-09599 Freiberg, Germany

The use of inert anodes in aluminium molten salt electrolysis offers positive environmental effects compared to the commercially used graphite anode, especially by avoiding CO, CO₂ and perfluorocarbon (PFC) emissions. Cermet anodes consisting of NiFe₂O₄, NiO, and Ni were manufactured by powder metallurgy and sintered at different conditions using the Spark Plasma Sintering (SPS) technique. Furthermore, another type of anode was produced using MgO and steel powder mixture to form metalloceramic composites. These anode materials were investigated by micro-Raman spectroscopy to identify phases formed during the sintering process, such as nickel ferrite spinels. Temperature-dependent Raman measurements were performed to examine the micro-structure behaviour of the anode materials at elevated temperatures.

Keywords: Raman spectroscopy; Metalloceramic composite materials; Phase identification; Spark Plasma Sintering; Spinels