Enthalpies of formation of selected Pd2YZ Heusler compounds |
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| Affiliation: | 1. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China;2. Laboratory for Microstructures, Shanghai University, Shanghai 200072, China;3. Department of Chemistry and Physics, Fayetteville State University, Fayetteville, NC 28301, USA;1. School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China;2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China;1. Department of Basic Sciences, Dar Al Uloom University, Riyadh, Saudi Arabia;2. Department of Basic Sciences, Middle East University, Amman, 11831, Jordan;3. Department of Physics, The University of Jordan, Amman, 11942, Jordan;1. Department of Physics, Erciyes University, 38039 Kayseri, Turkey;2. Department of Electricity, Kayseri Vocational School, Erciyes University, 38039 Kayseri, Turkey;3. Department of Physics, Polatlı Science and Arts Faculty, Gazi University, 06900 Ankara, Turkey;1. Département de SM, Institue des sciences et des technologies, Centre universitaire de Tissemsilt, 38000, Tissemsilt, Algérie;2. Modelling and Simulation in Materials Science Laboratory, Physics Department, University of Sidi Bel-Abbes, 22000 Sidi Bel-Abbes, Algeria;3. Department of Engineering Physics, Ankara University, Ankara, Turkey;4. Laboratoire de Physique Quantique de la Matière et de Modélisation Mathématique (LPQ3M), Université de Mascara, 29000 Mascara, Alegria;5. Department of Physics and Astronomy, College of Science, King Saud University, P.O Box 2455, Riyadh 11451, Saudi Arabia;6. Department of Physics, Pachhunga University College, Aizawl-796001, India;7. Materials Modeling Lab, Department of Physics, Islamia College University, Peshawar, Pakistan;8. Materials Science Laboratory, School of Physics, Vigyan Bhavan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India |
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| Abstract: | Standard enthalpies of formation of selected ternary Pd-based Heusler type compositions Pd2YZ (Y = Cu, Hf, Mn, Ti, Zr; Z = Al, Ga, In, Ge, Sn) were measured using high temperature direct synthesis calorimetry. The measured enthalpies of formation (in kJ/mole of atoms) of the Heusler compounds are, Pd2HfAl (−81.6 ± 2.4); Pd2HfGa (−79.9 ± 2.9); Pd2HfIn (−76.4 ± 1.4); Pd2HfSn (−77.6 ± 1.6); Pd2MnSn (−54.6 ± 3.1); Pd2TiGa (−65.6 ± 3.6); Pd2TiIn (−69.9 ± 2.1); Pd2TiSn (−78.6 ± 2.4); Pd2ZrAl (−85.3 ± 3.0); Pd2ZrGa (−76.2 ± 1.9); Pd2ZrIn (−85.1 ± 3.9); Pd2ZrSn (−92.2 ± 3.1); for the B2 compounds, Pd2MnAl (−87.1 ± 3.0); Pd2MnGa (−54.5 ± 1.7); Pd2MnIn (−41.0 ± 2.5); Pd2TiAl (−81.4 ± 1.9); for the tetragonal compound Pd2CuAl (−55.2 ± 3.0) and for the orthorhombic compound Pd2CuSn (−43.1 ± 2.3). Values were compared with those from published first principles calculation and the Open Quantum Materials Database (OQMD). Lattice parameters of these compounds were determined by X-ray diffraction analysis (XRD). Microstructures were identified using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Selected alloys were annealed at various temperatures to investigate phase transformations and phase relationships. |
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| Keywords: | A. Intermetallics B. Thermodynamic and thermochemical properties F. Calorimetry |
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