Pressure-composition-temperature curves and structure stability induced by hydrogen in TiZrNi quasicrystals

• Published in: Philosophical magazine (Abingdon, England) Vol. 91; no. 19-21; pp. 2937 - 2943
• Main Authors: Choi, Soo-bin, Lee, Sang-hwa, Kim, Jae yong
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Abingdon Taylor & Francis Group 01.07.2011; Taylor & Francis
• Subjects: Applied sciences; Chemical and electrochemical properties; Condensed matter: structure, mechanical and thermal properties; Constants; Diffraction patterns; Exact sciences and technology; Hydrogen storage; Hydrogenation; Metals. Metallurgy; P-c-T curves; Palladium; Physics; Quasicrystals; Semi-periodic solids; Structure of solids and liquids; crystallography; TiZrNiPd; Vapor pressure; X-rays; Titanium alloy; Hydrogen storage; Ternary alloy; Structure stability; Impurity density; Vapor pressure; Zirconium alloy; Hydrides; Lattice parameters; X ray diffraction; Hydrogenation; Palladium addition; Transition metal alloy; Hydrogen storage material; Quasicrystal; Nickel alloy
• ISSN: 1478-6435; 1478-6443
• DOI: 10.1080/14786435.2010.543093

To evaluate the potential applications of Ti-based quasicrystals as hydrogen storage materials, metastable Ti 53- x Zr 27 Ni 20 Pd x (x = 0, 2, 4, 6) quasicrystals were prepared by a rapid quenching method and equilibrium vapor pressures for hydrogen were measured. Pressure-composition-temperature curves measured in Pd-added TiZrNi quasicrystals revealed a significantly increased equilibrium vapor pressure for hydrogen with increasing Pd concentration, while hydrogen loading capacity decreased. After hydrogen absorption, no hydride phase was found for samples made with less than x = 4. The main peaks shifted to the lower angle of 2θ in X-ray diffraction patterns, demonstrating that the quasi-lattice constants increased from 5.13 to 5.38 Å after hydrogenation. The quasi-lattice constants linearly expanded with increasing absorption amount of hydrogen. Interestingly, analyzing the full width at half maximum values of the main peaks in the X-ray diffraction patterns showed that the coherence lengths of the quasicrystals significantly increased from 120 to 240 Å after hydrogenation, presumably due to kinetic rather than thermal factors.