5th FORUM ON NEW MATERIALS PART C Proceedings of the 5th - download pdf or read online

By Edited by Pietro VINCENZINI World Academy of Ceramics and National Research Council, Italy Co-edited by Kunihito KOUMOTO, Nagoya University, Japan Nicola ROMEO, University of Parma,

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Extra resources for 5th FORUM ON NEW MATERIALS PART C Proceedings of the 5th Forum on New Materials, part of CIMTEC 2010-12 th International Ceramics Congress and 5th Forum on New Materials Montecatini Terme, Italy, June 13-18, 2010

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Mater. Submitted. jp Keywords: thermoelectric material, intermetallic compound, Heusler alloy, powder metallurgy. Abstract. Sb-doped Heusler Fe2VAl alloy was synthesized to evaluate the effect of heavy element doping on thermoelectric properties of the Heusler alloy. For the sample preparation, a pulse-current sintering technique with fine powder prepared by mechanical alloying was used. By using the powder metallurgy technique, a heavy element with a low melting point can be stably doped, compared to the melting process.

An important question is the positions of the Sr and Eu guest atoms in Ba8-xAxGa16Si30 (A=Sr, Eu; x=1, 2). The Rietveld structure refinements confirmed that the Sr and Eu guest atoms preferentially occupy the 28 5th FORUM ON NEW MATERIALS PART C 2a site in the smaller cage but the occupancy of Sr atoms on the 6d site is relatively large in comparison to Eu atoms. The similar trend was reported for Ba6Eu2Cu4Si42 [5] and EuxBa8-xAl14Si31 [8]. The structure refinements also show that the atomic displacement parameters ADPs on the 2a site for Ba8-xEuxGa16Si30 (x=1 and 2) are significantly increased by a factor more than two relative to Ba8Ga16Si30.

In this study, V site was substituted by Ti [5] to obtain the p-type Heusler alloy. 16), powders were prepared, yielding finely pulverized and homogenized particles. 9%) powders were mixed and milled in a planetary ball mill with a 500-ml-capacity Cr steel pot and balls. In the milling system, the pot rotates on its axis against the direction of orbital motion. The pot was back-filled with a purified Ar gas atmosphere at 500 Torr after creating a vacuum. A total mass of 400 g of 5-mm-diameter Cr steel balls was inserted with 30 g of mixed powder into the pot: MA was performed at 280 rpm for 5 h with a half hour rest every hour.

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