TY  - JOUR
T1  - The Thermoelectric Power of Alumel at High Temperatures
AU - Trujillo, J. A. AU - Muriel, Garcia AU - Ortiz-Ortiz, Ruben-Dario 
JO  - Journal of Engineering and Applied Sciences
VL  - 11
IS  - 10
SP  - 2304
EP  - 2306
PY  - 2016
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2016.2304.2306
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2016.2304.2306
KW  - Alumel
KW  -thermoelectric power
KW  -phase transition
KW  -para-ferromagnetic
KW  -previously
AB  - An ac technique for the measurement of the thermoelectric power is introduced. We have developed a high resolution experimental set-up in the temperatures range 300-600 K. The method was used to measure the thermoelectric power (and specific heat) of the alumel alloy (95% Ni-2% Mn-2% Al-1% Si). Optical radiation was used to heat the sample periodically with a frequency of &#969;<SUB>0</SUB>/2&#960; = 2.6 Hz which induces temperature modulation T<SUB>ac</SUB> in one end of the sample. The induced emf, V<SUB>ac </SUB>(T), between the illuminated and the obscure ends of the sample was then measured. The thermoelectric power S (T) was calculated from the relation V<SUB>ac</SUB>/T<SUB>ac</SUB> whose data points indicate an anomaly near 463 K. The temperature region of this anomaly agrees with that of the previously reported specific heat anomaly of alumel which is associated with the para-ferromagnetic phase transition in this Ni alloy.
ER  -