Comprehensive Study of the Low-Temperature Transport and Thermodynamic Properties of the Cluster Compounds AgxMo9Se11 (3.41 ≤ x ≤ 3.78)

Autor: Malika Colin, T. Zhou, Patrick Gougeon, C. Boulanger, Anne Dauscher, Régis Gautier, E. Šantavá, R. Al Rahal Al Orabi, Bertrand Lenoir, Jiri Hejtmanek, Christophe Candolfi, Bruno Fontaine, P. Baranek, Michel Potel
Přispěvatelé: Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institute of Physics of the Czech Academy of Sciences (FZU / CAS), Czech Academy of Sciences [Prague] (CAS), EDF R&D (EDF R&D), EDF (EDF), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Région Lorraine, European Space Agency for financial support under an NPI contract, Hubert Curien bilateral French−Czech Barrande project, Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)
Rok vydání: 2014
Předmět:
Zdroj: Chemistry of Materials
Chemistry of Materials, 2014, 26 (16), pp.4765-4775. ⟨10.1021/cm5016367⟩
Chemistry of Materials, American Chemical Society, 2014, 26 (16), pp.4765-4775. ⟨10.1021/cm5016367⟩
ISSN: 1520-5002
0897-4756
DOI: 10.1021/cm5016367
Popis: International audience; We present a detailed study of the evolution of the electrical, galvanomagnetic and thermodynamic properties of polycrystalline AgxMo9Se11 compounds for 3.4 ≤ x ≤ 3.8 at low temperatures (2 – 350 K). In agreement with density functional theory calculations, the collected data show an overall gradual variation in the transport properties from metallic to semiconducting behavior on going from x = 3.4 to x = 3.8. The results evidence subtle variations in the electronic properties with the Ag content, typified by both positive and negative phonon-drag effects together with thermopower and Hall coefficient of opposite signs. Analysis of the data suggests that these features may be due to peculiarities of the dispersion of the valence bands in the vicinity of the chemical potential. A drastic influence of the Ag content on the thermal transport has been evidenced by a pronounced change in the temperature dependence of the specific heat below 10 K. Non-linearities in the Cp(T3) data are correlated to the concentration of Ag atoms, an increase in x resulting in a more pronounced departure from a Debye law. The observed behavior mirrors that of ionic conductors suggesting that AgxMo9Se11 for x > 3.6 might belong to this class of compounds.
Databáze: OpenAIRE