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J. Korean Ceram. Soc. > Volume 37(7); 2000 > Article
Journal of the Korean Ceramic Society 2000;37(7): 632.
고주파 진공유도로로 제작한 Fe-Si계 합금의 열전변환특성
박형진, 배철훈
인천대학교 공과대학 재료공학과
The Thermoelectric Properties of Fe-Si Alloys Prepared by RF Induction Furnace
Thermoelectric conversion properties of commercial Fe-Si2 and Fe-Si alloy ingots prepared by RF inductive furnace were investigated. As sintering temperature increased, density of the specimen increased and the phase transformation from metallic phases ($varepsilon$-FeSi, ${alpha}$-Fe2Si5) to semiconducting phase (${beta}$-FeSi2) occurred more effectively. The FeSi phase was detected even after 100hrs of annealing treatment. For the Fesi1.95∼FeSi2.05 specimens prepared by RF inductive furnace, the thermoelectric property improved as the composition of the specimen approached to stoichiometric composition FeSi2. Electrical conductivity of the specimen increased with increasing temperatures showing typical semiconducting behavior. From the electrical conductivity measurements, activation energy in the intrinsic region (above about 700 K) was calculated to be approximately 0.46 eV. In spite of non-doping, the Seebeck coefficient for every specimen exhibited p-type conduction due to Si deficiency. Its maximum value was located at about 475 K, and then decreased abruptly with increasing temperatures. The power factor was governed by the Seebeck coefficient of the specimen more significantly than by electrical conductivity.
Key words: Fe-Si alloy, Electrical conductivity, Seebeck coefficient, Power factor, RF inductive furnace
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