ECKSTEIN, Nadine; BOBET, Jean-Louis; CHEVALIER, Bernard; NILGES, Tom

doi:10.5560/ZNB.2011.66b1005

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ECKSTEIN, Nadine
Institut für Anorganische und Analytische Chemie

BOBET, Jean-Louis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHEVALIER, Bernard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Zeitschrift fur Naturforschung B. 2011, vol. 66, n° 10, p. 1005-1014

Verlag der Zeitschrift Fuer Naturforschung

Résumé en anglais

Measurements of the thermopower and of the thermal diffusivity and a detailed analysis of the structural features by temperature-dependent single-crystal structure determinations of silver ionconducting Ag5Te1.8Se0.2Cl and Ag5Te1.6Se0.4Cl were performed to investigate the interaction of silver ions in their disordered state. The substituted phases show an order/disorder phase transition at 273.3(2) and 302.5(2) K, respectively, accompanied by a drop of the thermal diffusivity and a minimum plateau of the thermopower right after the transition. Silver ions are arranged in welldefined strands along the crystallographic c axis characterized by a set of not fully occupied sites. Ag5Te1.6Se0.4Cl shows a negative thermal expansion during temperature rise right after the silver order/disorder phase transition; this is explicable by attractive d10-d10 interactions within the disordered silver substructure. After the minimum values of the thermopower have been reached, these values rise in parallel to the decrease of the d10-d10 interactions. Ag5Te1.6Se0.4Cl shows a very low value of the thermal diffusivity of 0.070 mm2 s−1 at 300.7 K.< Réduire

Mots clés en anglais

Silver

Tellurium

Polytelluride

Thermoelectrics

d10-d10 Interactions

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The influence of d10-d10 interactions in Ag5Te1.8Se0.2Cl and Ag5Te1.6Se0.4Cl on structural and thermoelectric properties

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