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Fast phase formation of double-filled p-type skutterudites by ball-milling and hot-pressing

Qing JieDepartment of Physics and TcSUH, University of Houston, Houston, Texas 77204, USAHengzhi WangDepartment of Physics and TcSUH, University of Houston, Houston, Texas 77204, USAWeishu LiuDepartment of Physics and TcSUH, University of Houston, Houston, Texas 77204, USAHui WangDepartment of Physics and TcSUH, University of Houston, Houston, Texas 77204, USAGang ChenDepartment of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAZhifeng RenDepartment of Physics and TcSUH, University of Houston, Houston, Texas 77204, USA

2013en

ABI

Annotatsiya

Filled-skutterudites are promising mid-temperature thermoelectric materials for heat-to-electricity conversion. Traditional preparation methods need a very long time annealing (7 to 14 days) to form the right skutterudite phase. Annealing is especially critical for p-type filled-skutterudites, since Fe4Sb12 needs filler atoms to enter the cage to form a stable phase. In this work, we prepared Ce and Nd double-filled p-type skutterudite materials by directly ball-milling the quenched ingot without annealing followed by hot-pressing. The results showed that with appropriate ball-milling time, a pure p-type filled-skutterudite phase can be obtained in just 5 minutes by hot-pressing. The samples prepared in this way have the same quality as those prepared by traditional long time annealing methods, and showed ZT values above 1 between 700 and 800 K. This simple and efficient method is very useful for the preparation of many other materials that are kinetically difficult to make.

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Identifikatorlar

DOI: 10.1039/c3cp50327e

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