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Author Levin, E. M. ♦ Pecharsky, V. K. ♦ Gschneidner, K. A.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABSORPTION ♦ ALLOYS ♦ MAGNETIC FIELDS ♦ PHASE TRANSFORMATIONS ♦ TEMPERATURE DEPENDENCE ♦ TEMPERATURE GRADIENTS ♦ THERMOCOUPLES ♦ THERMOELECTRICITY ♦ TRANSFORMATIONS
Abstract The spontaneous generation of voltage has been observed during the first-order magnetic-Martensitic phase transition process in Gd{sub 5}(Si{sub x}Ge{sub 4-x}) alloys regardless of whether the transformation is triggered by temperature or magnetic field. Based on various experimental data we show that thermoelectric power is a major contributor to the observed voltage. The characteristics of the simultaneously recorded spontaneous voltage and the signal from a differential thermocouple attached to the sample are quite complex, indicating that thermal effects arising in this class of materials during the first-order phase transition are nontrivial. The unusual dynamics of both the heat release and absorption during the phase transformations in Gd{sub 5}(Si{sub x}Ge{sub 4-x}) result in the appearance of temperature gradients and, therefore, thermoelectricity.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-05-01
Publisher Place United States
Journal Physical Review B
Volume Number 63
Issue Number 17


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