Dresden 2026 – scientific programme

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FM: Fachverband Funktionsmaterialien

FM 11: Poster Session Functional Materials

FM 11.18: Poster

Tuesday, March 10, 2026, 18:00–20:30, P4

Phase Transitions and Ferroic Properties in Organic*Inorganic Hybrid Halide TMCM-Mn*-*Fe*Cl* Crystals — •Chithra Kandappanthodi, Boris Slautin, Sobhan M Fathabad, Daniil Lewin, Doru Lupascu, and Vladimir Shvartsman — University of Duisburg-Essen

Organic*inorganic hybrid halides have garnered significant attention in materials science due to their eco-friendly, cost-effective synthesis, and outstanding optoelectronic properties. We report the properties of Fe-substituted trimethyl chloromethyl ammonium manganese trichloride TMCM-Mn1-xFexCl3 single crystals. The samples were obtained via the solvent evaporation seed assisted crystal growth method. Temperature-dependent X-ray diffraction and differential scanning calorimetry measurements confirm a sequence of structural phase transitions: from a monoclinic P121 phase at 302 K to monoclinic Cc, and subsequently to a hexagonal P6*/mmc phase at 408K for the pure TMCM-MnCl3 sample. Dielectric permittivity measurements indicate the improper ferroelectric transition at 408 K. Piezoresponse force microscopy further identifies well-defined ferroelastic domains at room temperature, which vanish upon heating above 304 K, as also observed using polarized light microscopy. Fe-substituted TMCM*Mn***Fe*Cl* samples exhibit a new intermediate phase transition near 328 K. UV*vis absorption spectra also demonstrate that increasing Fe content tunes the electronic bandgap. This comprehensive characterizations highlights TMCM-MnCl3, and TMCM-Mn1-xFexCl3 as a promising candidate for multifunctional applications.

Keywords: TMCM-MnCl3; Ferroelectric; Phase transition; Dielectric; Crystal