Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Ib
MM 17.15: Poster
Monday, March 18, 2024, 18:30–20:30, Poster F
Optothermal analysis of Indium thiospinels — •André Straßheim1, Cameliu Himcinschi1, Ayberk Özden2, Esteban Zuñiga-Puelles3, Roman Gumeniuk3, and Jens Kortus1 — 1TU Bergakademie Freiberg, Institute of Theoretical Physics, D-09599 Freiberg, Germany — 2TU Bergakademie Freiberg, Institute of Electronic and Sensor Materials, D-09599 Freiberg, Germany — 3TU Bergakademie Freiberg, Institute of Experimental Physics, D-09599 Freiberg, Germany
The temperature dependence of thermal conductivities of crystalline Indium thiospinels were characterized by optothermal Raman spectroscopy, a contactless method that can be used for small sample volumes. The obtained values are in fair agreement with those obtained from conventional laser flash analysis and thus, validates the employed technique. The temperature-dependent thermal conductivity of one Indium thiospinel sample was measured from 100 K to 343 K in steps of 50 K and ranged from 5.1 W/mK to 1.7 W/mK.
Furthermore, a reversible β (I41/amd) to α (Fd3m) phase transition was identified through temperature-dependent Raman spectroscopy. It was observed to be reversible and to occur between 440 K and 450 K.
In conclusion, this study suggests that optothermal Raman spectroscopy emerges as a valuable technique for probing the thermal properties of materials, particularly in cases where material volume is limited and when dealing with arbitrary shapes.
Keywords: Raman spectroscopy; optothermal; thermal conductivity; Indium thiospinel; phase transition