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WEB Thermoelectric Properties of Molybdenum Oxides MoOx from Spark-Plasma Synthesis

Wednesday (01.01.2020)
00:45 - 01:00
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.

Dipl.-Ing. Felix Kaiser
Max Planck Institute for Chemical Physics of Solids
Additional Authors:
  • Dr. Igor Veremchuk
    Max-Planck-Institut für Chemische Physik fester Stoffe
  • Dr. Marcus Schmidt
    Max-Planck-Institut für Chemische Physik fester Stoffe
  • Prof. Juri Grin
    Max-Planck-Institut für Chemische Physik fester Stoffe


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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