Analysis of Structure and P-c-T Curve of Hydrogenated Ti53Zr27-xNi20Pdx Quasicrystals

作者：Jo Youngsoo; Lee Sang Hwa; Shin Hong Sik; Kim Jaeyong^*

来源：Journal of Nanoscience and Nanotechnology, 2013, 13(12): 7959-7962.

DOI：10.1166/jnn.2013.8124

• TiZrNi Alloys
• Quasicrystals
• P-c-T Curves
• Hydrogen Storage

The potential application of TiZrNi quasicrystals was evaluated by measuring the pressure-composition-temperature curves after replacing Zr by Pd to the limit maintaining the host structure for the samples made with Ti53Zr27-xNi20Pdx, where 0 %26lt;= x %26lt;= 8. The results of X-ray diffraction data revealed that the samples keep the pure quasicrystal structure to the maximum value of x = 8. All diffracted peaks uniformly shifted to the low angle of 2 theta in X-ray diffraction pattern suggesting that hydrogen atoms homogeneously diffuse in the quasicrystals and uniformly expand the quasilattice constants without modification of the structure. After hydrogenation at elevated temperature, the quasi-lattice constants increased from 5.12 to 5.34 angstrom for the samples made with x = 0 without appearing an impurity phase. When Zr was replaced by 8 at.% of Pd, the equilibrium vapor pressures significantly increased to 3.41 from 0.41 Torr at 300 degrees C although the total amount of hydrogen decreased as increasing Pd concentration. These results demonstrate that Pd will play a critical role in application for the TiZrNi quasicrystals as hydrogen storage materials.

• 出版日期2013-12