WEB Thermoelectric Properties of Molybdenum Oxides MoOx from Spark-Plasma SynthesisFriday (25.09.2020) 09:45 - 10:00 F: Functional Materials, Surfaces, and Devices 1 Part of:
Authors: Felix Kaiser*, Marcus Schmidt, Igor Veremchuk, Yuri Grin
Transition metal oxides are of high interest to the thermoelectric community due to their possible high-temperature applicability, low toxicity and wide range of tunable thermoelectric properties.
Despite the apparent simplicity of the system Mo-O, the binary MoOx compounds (2 ≤ x ≤ 3) exhibit a wide range of extraordinary physical properties, like the exceptionally low thermal conductivity which we find in Mo18O52 (x = 2.889), or the pseudo two-dimensional electrical conductivity of the Mo4O11 polymorphs (x = 2.750). Most of these versatile properties are unknown above room temperature and thus, their applicability for thermoelectrics needs to be studied. Therefor, Spark-Plasma Synthesis (SPS) enables us to prepare gram-sized amounts of single-phase materials suitable for thermoelectric transport measurements over wide temperature ranges (1.8 K ≤ T ≤ 760 K).
The diversity of transport properties is mainly based on the MoOx compounds’ complex crystal structures which arise from the mixed valence of the Mo cations ranging from +4 to +6. Thus, an understanding of the adaptibility of these compounds always requires detailed stereochemical examinations by means of crystal structure determination from X-ray diffraction experiments which we perform.
|Category||Short file description||File description||File Size|
|Extended Abstract||Overview poster||This poster summarizes some of the recent work on molybdenum oxides which will be presented in the talk.||3 MB||Download|