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  Mg-containing multi-principal element alloys for hydrogen storage: A study of the MgTiNbCr0.5Mn0.5Ni0.5 and Mg0.68TiNbNi0.55 compositions

Marques, F., Cavalcanti Pinto, H., Figueroa, S. J. A., Winkelmann, F., Felderhoff, M., Botta, W. J., et al. (2020). Mg-containing multi-principal element alloys for hydrogen storage: A study of the MgTiNbCr0.5Mn0.5Ni0.5 and Mg0.68TiNbNi0.55 compositions. International Journal of Hydrogen Energy, 45(38), 19539-19552. doi:10.1016/j.ijhydene.2020.05.069.

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 Creators:
Marques, Felipe1, Author
Cavalcanti Pinto, Haroldo2, Author
Figueroa, Santiago Jose Alejandro3, Author
Winkelmann, Frederik4, Author           
Felderhoff, Michael4, Author           
Botta, Walter José5, Author
Zepon, Guilherme5, Author
Affiliations:
1Graduate Program of Materials Science and Engineering, Federal University of Sao Carlos , Rod. Washington Luis, Km 235, CEP: 13565-905, São Carlos-SP, Brazil, ou_persistent22              
2Engineering School of São Carlos, University of São Paulo, CEP: 13563-120, São Carlos, Brazil, ou_persistent22              
3Brazilian Synchrotron Light Laboratory (LNLS), Center for Research in Energy and Materials (CNPEM), Campinas-SP, Brazil, ou_persistent22              
4Research Group Felderhoff, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_3027887              
5Department of Materials Engineering, Federal University of São Carlos, Rod. Washington Luis, Km 235, CEP: 13565-905, Sao Carlos-SP, Brazil, ou_persistent22              

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Free keywords: Hydrogen-storage materials; Metal hydrides; Multi-principal element alloys; Solid solution; Synchrotron diffraction; Ball milling
 Abstract: Recently, there has been growing interest in multi-principal element alloys for hydrogen storage. However, most of the papers published so far report compositions based only on transition metal elements, which limit the gravimetric storage capacities due to their densities. Since Mg is a low-density element promising for hydrogen storage, the study of Mg-containing multi-principal element compositions is opportune. In the present work, we report for the first time the structural characterization and hydrogen storage properties of the A2B type MgTiNbCr0.5Mn0.5Ni0.5 alloy and its derivative Mg0.68TiNbNi0.55 alloy. These Mg-containing multi-principal element alloys form major BCC phase (W-type, Im3̅ m) and major FCC hydride (MH2 with CaF2-type structure) when synthesized by mechanical alloying (MA) and reactive milling (RM), respectively. Hydrogen is desorbed from both RM samples in two steps, with some overlap, from different hydrides formed during synthesis. The microstructure of the Mg0.68TiNbNi0.55 composition is more homogeneous (less secondary phases), but both alloys present a total gravimetric capacity of around 1.6 wt% H2.

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Language(s): eng - English
 Dates: 2020-03-082020-05-072020-06-012020-07-31
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.ijhydene.2020.05.069
 Degree: -

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Title: International Journal of Hydrogen Energy
  Other : Int. J. Hydrog. Energy
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 45 (38) Sequence Number: - Start / End Page: 19539 - 19552 Identifier: ISSN: 0360-3199
CoNE: https://pure.mpg.de/cone/journals/resource/954925521672