Heat capacity measurements of the Fe2Nb and Fe7Nb6 intermetallic compounds (2021)
- Authors:
- USP affiliated authors: COELHO, GILBERTO CARVALHO - EEL ; NUNES, CARLOS ANGELO - EEL ; ELENO, LUIZ TADEU FERNANDES - EEL
- Unidade: EEL
- DOI: 10.1016/j.jallcom.2021.160411
- Assunto: MATERIAIS
- Keywords: Heat capacity; Differential scanning calorimetry; Intermetallics; Experimental calorimetry
- Agências de fomento:
- Language: Inglês
- Abstract: The molar heat capacities of the Fe2Nb and Fe7Nb6 intermetallic compounds are reported here for the first time. The results were obtained via Differential Scanning Calorimetry (DSC) measurements, performed in a temperature range between 348 and 1038 K. The alloys were prepared by arc-melting high purity metals under argon flux and later heat-treated at 1200 ∘ C for 336 h encapsulated in quartz tubes under argon to ensure thermodynamic equilibrium. The resulting samples were then characterized using X-Ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM). The heat-capacity DSC measurements were carried out using an alternating step method with 20 and 50 K steps, with the resulting Cp associated with the midpoint of each temperature interval. A fit to a simplified Cp(T) curve was employed, due to the scatter in the data. Quasi-Harmonic Approximation (QHA) calculations were also performed, showing a good agreement with the measured values. Experimental results of heat capacity, along with other thermodynamic properties and phase equilibria, are key information for binary and ternary systems, specially for CALPHAD-type assessments. The results were therefore compared with the Kopp-Neumann approximation, used in recent assessments, showing that the parameters of both compounds can be improved in current CALPHAD databases, which motivates future work on the Fe-Nb system.
- Imprenta:
- Publisher: Elsevier
- Publisher place: Hangzhou-Ch
- Date published: 2021
- Source:
- Título: Journal of alloys and compounds
- ISSN: 0925-8388
- Volume/Número/Paginação/Ano: v.878, p.1-7, art. n. 160411, 2021
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
-
ABNT
SILVA, Antonio Augusto Araujo Pinto et al. Heat capacity measurements of the Fe2Nb and Fe7Nb6 intermetallic compounds. Journal of alloys and compounds, v. 878, n. art. 160411, p. 1-7, 2021Tradução . . Disponível em: https://doi.org/10.1016/j.jallcom.2021.160411. Acesso em: 04 ago. 2025. -
APA
Silva, A. A. A. P., Lamoglia, M. S., Silva, G., Fiorani, J. M., David, N., Vilasi, M., et al. (2021). Heat capacity measurements of the Fe2Nb and Fe7Nb6 intermetallic compounds. Journal of alloys and compounds, 878( art. 160411), 1-7. doi:10.1016/j.jallcom.2021.160411 -
NLM
Silva AAAP, Lamoglia MS, Silva G, Fiorani JM, David N, Vilasi M, Coelho GC, Nunes CA, Eleno LTF. Heat capacity measurements of the Fe2Nb and Fe7Nb6 intermetallic compounds [Internet]. Journal of alloys and compounds. 2021 ;878( art. 160411): 1-7.[citado 2025 ago. 04 ] Available from: https://doi.org/10.1016/j.jallcom.2021.160411 -
Vancouver
Silva AAAP, Lamoglia MS, Silva G, Fiorani JM, David N, Vilasi M, Coelho GC, Nunes CA, Eleno LTF. Heat capacity measurements of the Fe2Nb and Fe7Nb6 intermetallic compounds [Internet]. Journal of alloys and compounds. 2021 ;878( art. 160411): 1-7.[citado 2025 ago. 04 ] Available from: https://doi.org/10.1016/j.jallcom.2021.160411 - Thermodynamic assessment of the Ta-Ge system supported by ab initio calculations
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Informações sobre o DOI: 10.1016/j.jallcom.2021.160411 (Fonte: oaDOI API)
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