Formation of a dodecagonal phase in the nano-sized Ag-Pt multilayers upon solid-state reaction

Abstract

A dodecagonal quasicrystalline phase was grown in nano-sized Ag-Pt multilayers upon solid-state reaction and the existence of the respective metastable state in the Ag-Pt system was also confirmed by ion-beam mixing experiments. The major driving force for intermixing between the nano-sized Ag and Pt layers, as well as for the crystal-to-quasicrystal transition, was thought to be the interfacial free energy, which elevated the initial Ag-Pt multilayers up to an energetic state corresponding to the dodecagonal phase.

Superspin glass originating from dipolar interaction with controlled interparticle distance amongγ-Fe2OHiroi1, Komatsu2, Sato3 2011Phys. Rev. B982500View full textAdd to dashboardCite

“…These values almost agree with τ * obtained by dynamic-scaling analysis and is consistent with the previous report indicating that the two relaxation times are intrinsically the same. 30 Concerning L12, however, τ * ∼ 1 × 10 −12 s is rather smaller than τ of 1-3 × 10 −8 s, even when a large margin of error is considered because the margin of error in fitting of τ * for L12 is lnτ * = ±3.4, indicating 3.4 × 10 −14 s < τ * < 3.1 × 10 −11 s. 37 Such a disagreement between τ * and τ has also been observed in another report, 4 which indicates that strong interparticle interaction can modify the relaxation time of a single particle.…”

“…2 These results are consistent with many experimental observations that T peak shifts toward the higher temperature because of the influence of interparticle interaction. 4,5 Figure 3 shows log T peak as a function of log L. The solid line represents the strength of dipolar interaction as…”

“…There have been many reports that the anisotropic-energy barrier in interacting particle systems increases with interparticle interaction, and that the blocking temperature is higher than that in an isolated particle system. 4,5 In 1988 Dormann et al 6 proposed a model in which the interaction energy E int is added to the energy barrier E a in the expression of superparamagnetic relaxation time τ as follows:…”

Cryogenic implementation of charging diamond anvil cells with H2 and D2

“…The crystal lattice parameters at 3.5 GPa are in excellent agreement with the previous work that estimated the hydrogen composition x of ε -FeH x to be close to 1. 18 When ε -FeH sample was cooled down, the electrical resistance showed positive temperature dependence, indicating ε -FeH is metallic.…”

“…17 When bcc-structured α-Fe is compressed in H 2 at 3.5 GPa and room temperature, the α-Fe (bcc) to ε -FeH (dhcp) structural transition is induced. 18 In the case of pure Fe, α-Fe (bcc) to ε -Fe (hcp) transition takes place at 13 GPa and room temperature. 19 For purpose of studying the changes of electrical and structural properties of FeH under high H 2 pressures at low temperatures, we have performed the simultaneous measurements of x-ray diffraction and electrical resistance.…”