Regensburg 2025 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 6: Phase Transformations

MM 6.7: Talk

Monday, March 17, 2025, 17:30–17:45, H10

Phase-stability Study of the Marcasite-Structure Solid Solutions (Fe, TM)Sb₂ (TM = Cr, Ni) Synthesized via Combinatorial Co-Deposition and Antimonization — •Martin Kostka¹, Luqman Mustafa¹, Maik Golombiewski¹, Jill Fortmann², Aurelija Mockute², Alan Savan², Alfred Ludwig², Adreas Kreyssig¹, and Anna Böhmer¹ — ¹Experimental physics IV, Ruhr University Bochum, 44801 Bochum — ²Materials Discovery and Interfaces, Institute for Materials, Ruhr University Bochum, 44801 Bochum

Transition-metal di-pnictides of the pyrite-marcasite family are model systems for crystal chemistry. We investigate phase formation and stability of transition-metal di-antimonides in the orthorhombic marcasite structure. We employ a two-step synthesis of granular films, using combinatorial co-deposition of the transition metals and subsequent antimonization at different temperatures. This technique allows efficient exploration of substitution ranges and lattice parameter evolution within the marcasite structure. We investigate the formation and crystal structures of the (Fe,Ni)Sb₂ and (Fe,Cr)Sb₂ substitution series. We evidence the continuous substitution of FeSb₂ (class A marcasite) with Ni up to Fe_0.5Ni_0.5Sb₂, and a clear phase separation between Fe_0.5Ni_0.5Sb₂ and a Ni-rich Ni_1−zFe_zSb₂ phase (class B marcasite). Cr-substituted FeSb₂ shows a subtle phase separation into an Fe-rich Fe_1−yCr_ySb₂ and a Cr-rich Cr_1−zFe_zSb₂-phase (both class A marcasite) when synthesized at 500^∘C, but not at higher Temperatures. We acknowledge support from DFG (TRR288,A02).

Keywords: intermetallic compounds; substitution; marcasite