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Journal article
Elastic properties, thermal stability, and thermodynamic parameters of MoAlB
Physical review. B, Condensed matter and materials physics, v 95(14), p144108
2017
Abstract
MoAlB is the first and, so far, the only transition-metal boride that forms alumina when heated in air and is thus potentially useful for high-temperature applications. Herein, the thermal stability in argon and vacuum atmospheres and the thermodynamic parameters of bulk polycrystalline MoAlB were investigated experimentally. At temperatures above 1708 K, in vacuum and inert atmospheres, this compound incongruently melts into the binary MoB and liquid aluminum metal as confirmed by differential thermal analysis, quenching experiments, x-ray diffraction, and scanning electron microscopy. Making use of that information together with heat-capacity measurements in the 4–1000-K temperature range—successfully modeled as the sum of lattice, electronic, and dilation contributions—the standard enthalpy, entropy, and free energy of formation are computed and reported for the full temperature range. The standard enthalpy of formation of MoAlB at 298 K was found to be −132 ± 3.2 kJ/mol. Lastly, the thermal conductivity values are computed and modeled using a variation of the Slack model in the 300–1600-K temperature range.
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Details
- Title
- Elastic properties, thermal stability, and thermodynamic parameters of MoAlB
- Creators
- Sankalp Kota - Nanomaterials ResearchMatthias Agne - Northwestern UniversityEugenio Zapata-Solvas - Department of MaterialsOlivier Dezellus - Laboratoire des Multimatériaux et InterfacesDiego Lopez - Texas A&M UniversityBruno Gardiola - Laboratoire des Multimatériaux et InterfacesMiladin Radovic - Texas A&M UniversityMichel Barsoum - Nanomaterials Research
- Publication Details
- Physical review. B, Condensed matter and materials physics, v 95(14), p144108
- Publisher
- American Physical Society
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000399936600001
- Scopus ID
- 2-s2.0-85017510654
- Other Identifier
- 991019167745004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter