creator Chung, Yoonsung advisor Nash, Philip Heusler compounds are of great interest for their properties such as shape memory, thermoelectric, ferromagnetic and spin polarization effects that could lead to new mechanical and electronic devices. Currently, the study of Heusler alloys is focused on their electronic and magnetic properties, but the high temperature thermodynamic properties of these compounds have not been covered as much. A thorough knowledge of the thermodynamic properties and phase equilibria is required for developing this kind of alloys. This thesis is part of a systematic investigation of the thermodynamics and phase equilibria of ternary Heusler alloy systems. In this work, the high temperature reaction calorimeter was used to obtain the standard enthalpy of formation of compounds in the Ni2XSn (X = Ti, Zr, Hf, V and Nb) and Ni2TiX (X = Ga and In) ternary systems. It was confirmed the compound Ni2TaSn does not exist in the Heusler structure A Setaram Ligne 96 drop calorimeter was used to measure the heat content of Ni2TiSn as a function of temperature. Phase equilibria and crystal structures of Ni2TiSn, Ni2TiGa and Ni2TiIn were determined using XRD, SEM and EDS. Submitted by Lance Garrison (garrlanc@my.dom.edu) on 2012-03-07T03:54:22Z No. of bitstreams: 2 abstract.pdf: 45056 bytes, checksum: 47410b50b04d58d3206a505d7f5aebca (MD5) Yoonsung_Chung_Thesis_Final.pdf: 9863650 bytes, checksum: 0e60e3af462341d343012243ddb537f2 (MD5) Made available in DSpace on 2012-03-07T03:54:22Z (GMT). No. of bitstreams: 2 abstract.pdf: 45056 bytes, checksum: 47410b50b04d58d3206a505d7f5aebca (MD5) Yoonsung_Chung_Thesis_Final.pdf: 9863650 bytes, checksum: 0e60e3af462341d343012243ddb537f2 (MD5) Previous issue date: 2011-07 M.S. in Materials Science & Engineering, July 2011 2011-09 2011-07 http://hdl.handle.net/10560/2552 en Thesis born digital application/pdf In Copyright http://rightsstatements.org/page/InC/1.0/ Restricted Access MMAE / Mechanical, Materials, and Aerospace Engineering Illinois Institute of Technology Affiliated department