Regensburg 2025 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Poster

KFM 14.5: Poster

Mittwoch, 19. März 2025, 17:00–18:30, P1

Synthesis, Properties, and Phase Transitions analysis of ferroelectric TMCM-MnCl3 hybrid halide — •Chithra Kandappanthodi, Sobhan Fathabad, Doru C.Lupascu, and Vladimir V.Shvartsman — Institute for material science, Essen, Germany

Organic-inorganic hybrid halides have gained significant attention in material science due to their environmentally friendly, cost-effective fabrication and exceptional piezoelectric or optoelectronic properties. In this study, we synthesized trimethyl chloromethyl ammonium manganese trichloride (TMCM-MnCl3) and Fe-doped TMCM-MnCl3 crystals. We demonstrate that TMCM-MnCl3 exhibits a monoclinic crystal structure at room temperature, which transforms into a hexagonal structure upon heating, as confirmed by temperature-dependent x-ray diffraction. The phase transitions at 408 K for TMCM-MnCl3 and 404 K for TMCM-Mn0.95Fe0.05Cl3 were further corroborated by differential scanning calorimetry. The step-like anomaly in the temperature dependence of dielectric permittivity observed in TMCM-MnCl3 indicates an improper ferroelectric transition. Piezoresponse force microscopy revealed regular ferroelectric domains. Additionally, Raman spectroscopy identify the vibrational modes of the crystal. Through UV-vis spectroscopy, we observed that the bandgap is tunable through moderate Fe doping. This comprehensive characterization highlights the potential of TMCM-MnCl3 for advanced applications.

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