TY - CONF KW - 3 omega method KW - aluminium alloys KW - Electrical and thermal conduction in amorphous and liquid metals and alloys [A7215C] KW - heat losses KW - Lattice and electronic heat capacity of solids [A6540E] KW - manganese alloys KW - minimised radiative heat loss KW - palladium alloys KW - quasicrystals KW - radiative effects KW - specific heat KW - steady state gradient method KW - Thermal conductivity KW - thermoelectric applications KW - thermoelectric material AU - P. Davis AU - Peter Barnes AU - Cronin Vining AU - A. Pope AU - B. Schneidmiller AU - T. Tritt AU - J. Kolis AB -

Measurements of the thermal conductivity on a potential high temperature thermoelectric material, the quasicrystal Al70.8Pd20.9Mn8.3 are reported. Thermal conductivity is determined over a temperature range from 30 K to 600 K, using both the steady state gradient method and the 3 omega method. Measurements of high temperature thermal conductivity are extremely difficult using standard heat conduction techniques. These difficulties arise from the fact that heat is lost due to radiative effects. The radiative effects are proportional to the temperature of the sample to the fourth power and therefore can lead to large errors in the measured thermal conductivity of the sample, becoming more serious as the temperature increases. For thermoelectric applications in the high temperature regime, the thermal conductivity is an extremely important parameter to determine. The 3 omega technique minimizes radiative heat loss terms, which will allow for more accurate determination of the thermal conductivity of Al/sub 70.8/Pd/sub 20.9/Mn/sub 8.3/ at high temperatures. The results obtained using the 3 omega method are compared to results from a standard bulk thermal conductivity technique on the same samples over the temperature range, 30 K to 300 K

C1 - Warrendale, PA, USA C3 - Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications. Symposium: Materials Research Society Symposium Proceedings DA - 2001 LA - eng N2 -

Measurements of the thermal conductivity on a potential high temperature thermoelectric material, the quasicrystal Al70.8Pd20.9Mn8.3 are reported. Thermal conductivity is determined over a temperature range from 30 K to 600 K, using both the steady state gradient method and the 3 omega method. Measurements of high temperature thermal conductivity are extremely difficult using standard heat conduction techniques. These difficulties arise from the fact that heat is lost due to radiative effects. The radiative effects are proportional to the temperature of the sample to the fourth power and therefore can lead to large errors in the measured thermal conductivity of the sample, becoming more serious as the temperature increases. For thermoelectric applications in the high temperature regime, the thermal conductivity is an extremely important parameter to determine. The 3 omega technique minimizes radiative heat loss terms, which will allow for more accurate determination of the thermal conductivity of Al/sub 70.8/Pd/sub 20.9/Mn/sub 8.3/ at high temperatures. The results obtained using the 3 omega method are compared to results from a standard bulk thermal conductivity technique on the same samples over the temperature range, 30 K to 300 K

PB - Mater. Res. Soc PY - 2001 EP - 7 EP - Z5.4.1+ TI - High temperature thermal conductivity measurements of quasicrystalline Al70.8Pd20.9Mn8.3 UR - http://cvining.com/system/files/articles/vining/Vining-MRSSymp626-2000.pdf VL - 626 ER -