The observation of oscillatory behaviour in swift heavy ion irradiated quasicrystals
TL;DR: The effect of 835 MeV Kr irradiation at 90 K on a stable icosahedral quasicrystal (Al 65 Cu 25 Fe 5 V 5 ) is discussed in this paper.
About: This article is published in Solid State Communications.The article was published on 2001-10-16. It has received 7 citations till now. The article focuses on the topics: Swift heavy ion & Fluence.
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01 Apr 2006-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, the stability of the icosahedral quasicrystalline alloy Zr64.5Ti11.4Ni13.8Cu10.3 under irradiation with swift heavy ions was examined.
Abstract: The stability of the icosahedral quasicrystalline alloy Zr64.5Ti11.4Ni13.8Cu10.3 under irradiation with swift heavy ions was examined. The electronic energy loss (dE/dx)e was varied from 18 keV/nm to 38 keV/nm and 42 keV/nm by use of 300 MeV Kr and 350 MeV and 593 MeV Au ions, respectively. The changes of the microstructure of the quasicrystalline phase were characterized ex situ by X-ray diffraction and transmission electron microscopy (TEM). Irradiation with 300 MeV Kr up to a fluence of 5 × 1013 ions/cm2 did not lead to any changes of the microstructure of the quasicrystalline phase, whereas this phase was completely amorphized by the Au-ions already after a fluence of 1 × 1013 ions/cm2. After applying a lower fluence of 1 × 1011 ions/cm2 (593 MeV Au) single ion tracks were visualized by TEM.
13 citations
01 Sep 2003-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this article, the effect of irradiation with 900 MeV Pb and 780 MeV Xe ions on quasicrystals Al 62 Cu 25.5 Fe 12.5 and the related cubic α-phase Al 55 Cu 27 Fe 11 Si 7.
Abstract: We have studied the effect of irradiation with 900 MeV Pb and 780 MeV Xe ions on quasicrystals Al 62 Cu 25.5 Fe 12.5 and the related cubic α-phase Al 55 Cu 27 Fe 11 Si 7 . The fluences ranged from 10 10 to 5.8 × 10 13 ions/cm 2 . Irradiations were performed at 80 K and at room temperature. The structural changes induced by the electronic excitations were studied by high-resolution X-ray diffraction. Whereas one might have expected the irradiations to induce important structural transformations, e.g. a phase transition from an icosahedral to a rhombohedral phase, only minor structural modifications are observed in the icosahedral phase and none in the α-phase. The defects created are not phasonic. Our results suggest a remarkable structural stability of these phases with respect to heavy-ion irradiation.
7 citations
TL;DR: In this paper, the effect of swift heavy ion irradiation on a stable and well-studied Al 62 Cu 25.5 Fe 12.5 icosahedral quasicrystalline system is discussed.
Abstract: The effect of swift-heavy-ion irradiation on a very stable and well-studied Al 62 Cu 25.5 Fe 12.5 icosahedral quasicrystalline system is discussed here. The experiments are performed in the pure electronic excitation regime, where various ranges of energy (1.2 to ∼2.5 keV/A) are systematically deposited in to the system, causing electronic excitations in them. The choice of ions was generally dependent on calculations based on Monte-Carlo simulations and some existing literature studies on metals/metallic alloys. Samples were irradiated at fluences of 10 11 to a few 10 13 ions/cm 2 , and a homogeneous irradiation was ensured. The effect of these electronic excitations on the electronic structure of the quasicrystals is analyzed by doing in situ resistivity vs. fluence and ex situ resistivity vs. temperature measurements, made on the irradiated pieces.
4 citations
01 Jan 2011
TL;DR: In this article, the effects of heavy ion irradiation on various types of materials are studied using sophisticated characterization tools, such as XRD, RBS, ERDA, High resolution transmission microscopy, Photoluminescence spectroscopy, Fourier transform infrared and Raman spectroscopic, SQUID, AFM, SEM, etc.
Abstract: High energy heavy ions are proving to be important tools in the efforts to modify the properties of materials in a controlled fashion to provide possibility of making them functional for specific applications in planned developments towards futuristic technologies. Presently, research in this field is mostly of exploratory kind. Various types of materials are being irradiated with swift heavy ions and the effects of irradiation are being studied using the sophisticated characterization tools, such as XRD, RBS, ERDA, High resolution transmission microscopy, Photoluminescence spectroscopy, Fourier transform infrared and Raman spectroscopy, SQUID, AFM, SEM, etc.
2 citations
TL;DR: In this paper, the effect of 100 MeV 58 Ni +8 ion irradiation on the electrical transport behavior of Al-Cu-Fe quasicrystalline thin films have been investigated by in situ and ex situ resistivity measurements.
2 citations
References
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01 Jan 1956
TL;DR: In this article, the authors present a chemical analysis of X-ray diffraction by Xray Spectrometry and phase-diagram Determination of single crystal structures and phase diagrams.
Abstract: 1. Properties of X-rays. 2. Geometry of Crystals. 3. Diffraction I: Directions of Diffracted Beams. 4. Diffraction II: Intensities of Diffracted Beams. 5. Diffraction III: Non-Ideal Samples. 6. Laure Photographs. 7. Powder Photographs. 8. Diffractometer and Spectrometer. 9. Orientation and Quality of Single Crystals. 10. Structure of Polycrystalline Aggregates. 11. Determination of Crystal Structure. 12. Precise Parameter Measurements. 13. Phase-Diagram Determination. 14. Order-Disorder Transformation. 15. Chemical Analysis of X-ray Diffraction. 16. Chemical Analysis by X-ray Spectrometry. 17. Measurements of Residual Stress. 18. Polymers. 19. Small Angle Scatters. 20. Transmission Electron Microscope.
17,428 citations
TL;DR: In this article, an extensive study of the approximant phases present in the Al - Cu - Fe phase diagram in the vicinity of the icosahedral phase is presented. And the identification of these structures, via x-ray diffraction and TEM, is based on both symmetry considerations and the ''shear'' description in the perpendicular space.
Abstract: We present an extensive study of the approximant phases present in the Al - Cu - Fe phase diagram in the vicinity of the icosahedral phase. In addition to the rhombohedral and the two pentagonal phases previously observed, a new orthorhombic approximant has been identified. The identification of these structures, via x-ray diffraction and TEM, is based on both symmetry considerations and the `shear' description in the perpendicular space. These simple geometric tools give very satisfactory and accurate crystallographic results. This suggests that these phases derive from the parent icosahedral phase both via systematic introduction of atomic jumps preserving most of the atomic local environments and via long-range atomic diffusion.
99 citations
02 Mar 1990-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this article, the authors used collective effects in the wake of the incident ion to explain both the increased damage efficiency and inhomogeneous damage distribution that leads to a very small saturation resistivity increase.
Abstract: The low-temperature damage induced by high-energy heavy ions in metallic targets has been followed by in-situ electrical-resistivity measurements. In Cu3Au alloys, the observed damage production can be accounted for by elastic-collision processes, whereas in Ni3Fe and iron, inelastic collisions must be put forward above an electronic stopping power threshold. In the latter case, collective effects in the wake of the incident ion could explain both (1) the increased damage efficiency and (2) the inhomogeneous damage distribution that leads to a very small saturation resistivity increase.
62 citations
TL;DR: In this paper, powder X-ray diffraction was used to study structural transformations resulting from phason instabilities in icosahedral Al-Cu-Fe using a projection of a distorted cubic six-dimensional lattice.
Abstract: Structural transformations resulting from phason instabilities in icosahedral Al–Cu–Fe have been studied by powder X-ray diffraction. Three approximant phases, the modulated icosahedral phase and a state with substantial phason disorder are located in the phase diagram. Diffraction scans of the transformations are modelled using a projection of a distorted cubic six-dimensional lattice.
38 citations