メカニカルアロイングにより合成したp型Si_<80>Ge_<20>焼結体の熱電特性 Thermoelectric Properties of Mechanically Alloyed p-type Si_<80>Ge_<20>
The key to improving the thermoelectric figure of merit of Si-Ge sytem is to reduce the thermal conductivity. Alloy powder with grain size of 20-30nm was prepared by mechanical alloying. The amounts of boron was varied to achieve optimum carrier concentration. The thermoelectric properties of the hot-pressed Si-Ge alloys were measured in the temperature range from 300 K to 1073 K.<BR>The sintered Si-Ge compact was found to have a fine grain structure of about 200 nm. As a consequence, a reduction in thermal conductivity of up to 30% was achieved compared to conventional p-type alloy. A maximum figure of merit of 9×10<SUP>-4</SUP>K<SUP>-1</SUP>was obtained at 1073K.
粉体および粉末冶金 45(8), 733-737, 1998-08-15
Japan Society of Powder and Powder Metallurgy