Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  Molybdenum Oxides MoOx: Spark-Plasma Synthesis and Thermoelectric Properties at Elevated Temperature

Kaiser, F., Schmidt, M., Grin, Y., & Veremchuk, I. (2020). Molybdenum Oxides MoOx: Spark-Plasma Synthesis and Thermoelectric Properties at Elevated Temperature. Chemistry of Materials, 20, 2025-2035. doi:10.1021/acs.chemmater.9b05075.

Item is

Basisdaten

einblenden: ausblenden:
Genre: Zeitschriftenartikel

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Kaiser, Felix1, Autor           
Schmidt, Marcus2, Autor           
Grin, Yuri3, Autor           
Veremchuk, Igor4, Autor           
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
3Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              
4Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: Molybdenum oxides MoOx in the composition range 2 ≤ x ≤ 3 were synthesized and compacted by the solid-state reaction of powdered α-MoO3 with Mo in the spark-plasma synthesis (SPS) process at temperatures up to 973 K. From six known compounds in the Mo–O system, Mo18O52 (x = 2.889), Mo17O47 (x = 2.760), and γ-Mo4O11 (x = 2.750) were synthesized as practically single-phase products despite their narrow composition ranges (≈0.1 at %) with a yield (0.5–1 g per synthesis) sufficient for thermoelectric property measurements on the polycrystalline bulk material from room temperature to 763 K. For Mo18O52, which appears to be an intrinsic narrow-gap semiconductor (activation energy ≈ 0.3 eV), exceptionally low thermal conductivity over the full temperature range (0.5–0.9 W m–1 K–1), high p-type Seebeck coefficient at room temperature (+140 μV K–1), and a p–n transition at 440 K were found. The phases MoO2, γ-Mo4O11, and Mo17O47 show poor metallic conductivity. The highest power factor is achieved by Mo17O47 (30 Wm–1 K–2 for 440 K ≤ T ≤ 610 K). In γ-Mo4O11, a hitherto unknown reversible transition is found at 450 K from specific heat measurements.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 2020-02-062020-02-06
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1021/acs.chemmater.9b05075
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Chemistry of Materials
  Kurztitel : Chem. Mater.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Washington, D.C. : American Chemical Society
Seiten: - Band / Heft: 20 Artikelnummer: - Start- / Endseite: 2025 - 2035 Identifikator: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571