Back to overview

Lecture

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.

Speaker:
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

Dateien

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