Pressure-composition-temperature curves and structure stability induced by hydrogen in TiZrNi quasicrystals
- Authors
- Choi, Soo-bin; Lee, Sang-hwa; Kim, Jae Yong
- Issue Date
- Feb-2011
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- quasicrystals; TiZrNiPd; hydrogen storage; P-c-T curves
- Citation
- PHILOSOPHICAL MAGAZINE, v.91, no.19-21, pp.2937 - 2943
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHILOSOPHICAL MAGAZINE
- Volume
- 91
- Number
- 19-21
- Start Page
- 2937
- End Page
- 2943
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/151332
- DOI
- 10.1080/14786435.2010.543093
- ISSN
- 1478-6435
- Abstract
- To evaluate the potential applications of Ti-based quasicrystals as hydrogen storage materials, metastable Ti53-xZr27Ni20Pdx (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 2 in X-ray diffraction patterns, demonstrating that the quasi-lattice constants increased from 5.13 to 5.38 angstrom 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 angstrom after hydrogenation, presumably due to kinetic rather than thermal factors.
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