Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 46: Transport properties II
HL 46.7: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, ER 325
Identifying different electronic transport mechanisms in nanoporous inorganic C12A7 using Hall measurements and electron paramagnetic resonance spectroscopy — •Julius K. Dinter1, Jurek Lange1,2, Detlev M. Hofmann1,2, J. Fabián Plaza Fernández3, Angel Post3, Sangam Chatterjee1,2, Matthias T. Elm1,2,4, and Peter J. Klar1,2 — 1Center for Materials Research, Justus-Liebig University, Heinrich-Buff-Ring 16, D-35392, Giessen, Germany — 2Institute of Experimental Physics I, Justus-Liebig University, Heinrich-Buff-Ring 16, D-35392, Giessen, Germany — 3Advanced Thermal Devices, Calle Villaconejos, 4, E-28925, Alcorcón, Spain — 4Institute of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, D-35392, Giessen, Germany
[Ca24Al28O64]4+(2O2-) is a nanoporous compound, whose properties are strongly determined by its degree of reduction. It consists of a positively charged cage and additional oxygen ions O2-, which ensure charge neutrality and can move almost freely between them. A transition from insulating behavior to metallic behavior occurs when replacing the O2- ions in the cages by electrons, finally generating the electride [Ca24Al28O64]4+. However, a complete understanding of the charge transport mechanisms of the system and their variation with the degree of reduction is far from complete. Here, we present the characterization of a series of [Ca24Al28O64]4+(2O2-)(1-x)(4e-)x with different x using Hall-measurements and electron paramagnetic resonance spectroscopy in a high temperature range. Three different transport mechanisms are identified which dominate at different temperatures.
Keywords: Electride; Hall-Measurment; Electron Paramagnetic Resonance Spectroscopy; C12A7; Electronic Transport Mechanism