Temperature Dependence of the Elastic Modulus of (Ni 0.6 Nb 0.4 ) 1?x Zr x Membranes: Effects of Thermal Treatments and Hydrogenation

Oriele Palumbo, Sergio Brutti, Francesco Trequattrini, Suchismita Sarker, Michael Dolan, Dhanesh Chandra and Annalisa Paolone
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Oriele Palumbo: CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy
Sergio Brutti: CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy
Francesco Trequattrini: Department of Physics, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Roma, Italy
Suchismita Sarker: Department of Chemical and Materials Engineering, University of Nevada, Reno, NV 89557, USA
Michael Dolan: CSIRO Energy Technology, Pullenvale, Queensland 4069, Australia
Dhanesh Chandra: Department of Chemical and Materials Engineering, University of Nevada, Reno, NV 89557, USA
Annalisa Paolone: CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy

Energies, 2015, vol. 8, issue 5, 1-11

Abstract: Amorphous (Ni 0.6 Nb 0.4 ) 1?x Zr x membranes were investigated by means of X-ray diffraction, thermogravimetry, differential thermal analysis and tensile modulus measurements. Crystallization occurs only above 673 K, and even after hydrogenation the membranes retain their mainly amorphous nature. However, after exposure to gaseous hydrogen, the temperature dependence of the tensile modulus, M, displays large variations. The modulus of the hydrogen reacted membrane is higher with respect to the pristine samples in the temperature range between 298 K and 423 K. Moreover, a sharp drop in M is observed upon heating to approximately 473 K, well below the glass transition temperature of these glasses. We propose that the changes in the moduli as a function of temperature on the hydrogenated samples are due to the formation of nanocrystalline phases of Zr hydrides in (Ni 0.6 Nb 0.4 ) 1?x Zr x -H membanes.

Keywords: amorphous membranes; hydrogenation; elastic modulus; X-ray diffraction (XRD); differential thermal analysis (DTA); thermogravimetric analysis (TGA) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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