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Dissertation/Thesis Abstract

The Structural and Magnetic Stability of Select Ferrous Heusler Systems
by Hasier, John J., Ph.D., Illinois Institute of Technology, 2017, 298; 10273386
Abstract (Summary)

Heusler based functional or smart materials are a deep well of solutions to future energy, heat transport and mechanization problems. The half-metallic ferromagnetic nature of these crystalline intermetallic compounds is the source of their extraordinary properties. The loss of this magnetic ordering places limits on the range of application temperatures making knowledge of the Curie point of these novel materials essential for understanding of their limitations. High throughput continuous wavelet transform spectrum analysis of magnetic balance data generated on a custom modified Setaram Setsys Evolution 16/18 Differential Scanning Calorimeter-Differential Thermal Analyzer with simultaneous Thermogravimetric Analyzer was performed on select Fe, Co and Mn based Heusler compounds. The phase stability of Co-Fe-Si compounds is explored in relation to the high-Curie Temperature Co2FeSi and Fe2CoSi compounds via generation of equilibrium ternary isothermal phase diagrams at 1160 °C and 800 °C to enable greater control of the microstructure for future thermomechanically processed bulk smart device fabrication.

Indexing (document details)
Advisor: Nash, Philip
Commitee: Chen, Wei, Hasan, Saad, Segre, Carlo, Shaw, Leon
School: Illinois Institute of Technology
Department: Mechanical, Materials and Aerospace Engineering
School Location: United States -- Illinois
Source: DAI-B 78/10(E), Dissertation Abstracts International
Subjects: Materials science
Keywords: Calorimetry, Curie temperature, Ferromagnets, Heusler alloys, Physical metallurgy, Thermogravimetric analysis
Publication Number: 10273386
ISBN: 978-1-369-85510-4
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