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Energies 2015, 8(5), 3944-3954; doi:10.3390/en8053944

Temperature Dependence of the Elastic Modulus of (Ni0.6Nb0.4)1−xZrx Membranes: Effects of Thermal Treatments and Hydrogenation

1
CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy
2
Department of Science, University of Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy
3
Department of Physics, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Roma, Italy
4
Department of Chemical and Materials Engineering, University of Nevada, Reno, NV 89557, USA
5
CSIRO Energy Technology, Pullenvale, Queensland 4069, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Craig M. Jensen
Received: 27 February 2015 / Accepted: 20 April 2015 / Published: 6 May 2015
(This article belongs to the Special Issue Hydrides: Fundamentals and Applications)
View Full-Text   |   Download PDF [692 KB, uploaded 6 May 2015]   |  

Abstract

Amorphous (Ni0.6Nb0.4)1−xZrx 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 (Ni0.6Nb0.4)1−xZrx-H membanes. View Full-Text
Keywords: amorphous membranes; hydrogenation; elastic modulus; X-ray diffraction (XRD); differential thermal analysis (DTA); thermogravimetric analysis (TGA) amorphous membranes; hydrogenation; elastic modulus; X-ray diffraction (XRD); differential thermal analysis (DTA); thermogravimetric analysis (TGA)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Palumbo, O.; Brutti, S.; Trequattrini, F.; Sarker, S.; Dolan, M.; Chandra, D.; Paolone, A. Temperature Dependence of the Elastic Modulus of (Ni0.6Nb0.4)1−xZrx Membranes: Effects of Thermal Treatments and Hydrogenation. Energies 2015, 8, 3944-3954.

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