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Differential thermal analysis of individual specimens by thermal EMF measurement

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4 Author(s)
Riess, I. ; Physics Department, Technion‐Israel Institute of Technology, Haifa 32000, Israel ; Safadi, R. ; Zilberstein, E. ; Tuller, H.L.

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The thermal electromotive force (EMF) generated across a specimen owing to a small nonuniformity in the sample’s temperature is used to follow phase transitions in the specimen. As the temperature is scanned, a first‐order phase transition yields a sharp S‐shaped peak in the EMF versus time, t, and temperature, T(t), curves. A transition to a superconducting state exhibits a sharp drop in EMF as was observed during measurements on YBa2Cu3O7. The dependence of the EMF on time and temperature is calculated for a first‐order phase transition. Predictions are confirmed by experiment. This method is therefore useful for detecting phase transition temperatures. A practical feature of this measurement is the ability to precisely calibrate, in situ, the temperature measuring element, e.g., thermometer or thermocouple, when the transition temperature is already known.

Published in:

Journal of Applied Physics  (Volume:69 ,  Issue: 3 )

Date of Publication:

Feb 1991

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