Kubitza, Niels (2023)
Non-conventional synthesis and characterization of selected MAX phases and antiperovskite materials.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00026483
Dissertation, Erstveröffentlichung, Verlagsversion

Kurzbeschreibung (Abstract)

In this work, efficient, non-conventional solid-state methods were applied for the synthesis of selected MAX phases and antiperovskite materials. In the context of MAX phases, three hitherto unknown M-site solid-solution phases, as well as three new X-site solid-solution phases were prepared and comprehensively characterized. For the synthesis of the M-site solid-solution phases, the rapid microwave heating method was applied and led to the synthesis of (V1-xCrx)2GaC, (V1-xMnx)2GaC, and (Cr1-xMox)2GaC, respectively. Particularly, the synthesis of (V1-xCrx)2GaC provides a new approach to reach magnetic ordering in MAX phases since this system was identified as an itinerant Pauli paramagnet which is nearly magnetically ordered. In terms of the X-site solid solution phases, new synthesis approaches were developed to synthesize underrepresented nitride and carbonitride MAX phases by combining conventional/non-conventional heating methods with solvent-based precursor synthesis approaches (e.g., sol-gel synthesis, synthesis in liq. NH3). In the field of antiperovskites, it was concentrated on the magnetocaloric interesting phase Mn3GaC. Here, for the first time, a citric acid-based sol-gel approach was applied resulting in a highly phase pure product combined with a significant reduction of the reaction time.

Frage zum Eintrag

Redaktionelle Details anzeigen