title: Mechanism of Rare Earth Incorporation and Crystal Growth of Rare Earth Containing Type-I Clathrates.
abstract: Type-I clathrates possess extremely low thermal conductivities, a property that makes them promising materials for thermoelectric applications. The incorporation of cerium into one such clathrate has recently been shown to lead to a drastic enhancement of the thermopower, another property determining the thermoelectric efficiency. Here we explore the mechanism of the incorporation of rare earth elements into type-I clathrates. Our investigation of the crystal growth and the composition of the phase Ba8-xRExTMySi46-y(RE = rare earth element; TM = Au, Pd, Pt) reveals that the RE contentxis mainly governed by two factors, the free cage space and the electron balance.
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology , Wiedner Hauptstrasse 8-10, Vienna 1040, Austria.
authors.forename: Andrey
authors.initials: A
authors.lastname: Prokofiev
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology , Wiedner Hauptstrasse 8-10, Vienna 1040, Austria.
authors.forename: Robert
authors.initials: R
authors.lastname: Svagera
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology , Wiedner Hauptstrasse 8-10, Vienna 1040, Austria.
authors.forename: Monika
authors.initials: M
authors.lastname: Waas
authors.affiliation: Institute of Chemical Technologies and Analytics, Vienna University of Technology , Getreidemarkt 9/164-SC, 1060 Vienna, Austria.
authors.forename: Matthias
authors.initials: M
authors.lastname: Weil
authors.affiliation: USTEM, Wiedner Hauptstrasse 8-10, Vienna 1040 Austria.
authors.forename: Johannes
authors.initials: J
authors.lastname: Bernardi
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology , Wiedner Hauptstrasse 8-10, Vienna 1040, Austria.
authors.forename: Silke
authors.initials: S
authors.lastname: Paschen
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