Diffusion of hydrogen in Ti–Zr–Ni quasicrystals

“…The coherence length of the quasicrystal-phase grain is calculated by measuring the full width at half maximum (FWHM) value of the (110 000) peak, and was estimated in the range of 140 A $ 200 A, which is shorter than the ones measured by Azhazha et al [22] and Zhang et al [23]. The quasi-lattice constants are decreased (from 5.28 to 5.16 A) as increasing the Ti concentration (from 33 to 55 at%), suggesting that Ti occupies the sites for Zr and reduces the cell sizes due to the smaller atomic size.…”

Section: Resultsmentioning

confidence: 90%

Magnetic behaviors of Ti₅₀Zr₃₃Ni₁₇ quasicrystals measured by VSM

Lee¹,

Jeon²,

Shin³

et al. 2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. Quasicrystals made with Ti, Zr and Ni are good candidate materials studying the magnetic properties of aperiodic structure because the role of Ni in stabilization of the quasicrystal phase is important. Various magnetic states in quasicrystals have been reported including diamagnetism, paramagnetism, spin glass, ferromagnetism and ferrimagnetism. We prepared Ti--Zr--Ni quasicrystals by rapid quenching method. The magnetization (M) of Ti 50 Zr 33 Ni 17 quasicrystal was measured as a function of applied magnetic field (H) and a temperature by using a vibrating sample magnetometer (VSM). When the magnetic fields of higher than 2000 G were applied, the magnetization values were decreased as increasing temperature. The field-cooling (FC) and zero-field-cooling (ZFC) magnetization of the samples were also measured and showed no significant difference in magnetization behavior. Our combined results demonstrated that the rapidly quenched Ti--Zr--Ni quasicrystals exhibit paramagnetic properties with no hint of a measurable magnetic hysteresis. It is shown that Ti 50 Zr 33 Ni 17 quasicrystals demonstrate paramagnetic characteristic to the maximum applied magnetic field of 10 000 Oe. Interestingly, magnetization fluctuation was noticed in the regions of high magnetic field and at low temperature (25-300 K).

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“…Azhazha et al [66] have reported that absorbed hydrogen causes an increase in the electrical resistivity of the amorphous alloy Ti 66 Ni 20 Cu 10 Si 4 . The origin of the excess resistivity may be attributed to electron scattering on the deformed phonon spectrum and the interference of the latter scattering with inelastic scattering of electrons on hydrogen.…”

Section: Introductionmentioning

confidence: 99%