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Relevant bibliographies by topics / Atom channelling

Academic literature on the topic 'Atom channelling'

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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Journal articles on the topic "Atom channelling"

1

Otten, M. T., and P. R. Buseck. "Zone-axis ALCHEMI for the rapid assessment of site occupancies in garnets." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 706–7. http://dx.doi.org/10.1017/s0424820100144905.

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ALCHEMI (Atom Location by CHannelling-Enhanced Microanalysis) is a TEM technique for determining site occupancies in single crystals. The method uses the channelling of incident electrons along specific crystallographic planes. This channelling results in enhanced x-ray emission from the atoms on those planes, thereby providing the required site-occupancy information. ALCHEMI has been applied with success to spinel, olivine and feldspar. For the garnets, which form a large group of important minerals and synthetic compounds, the channelling effect is weaker, and significant results are more difficult to obtain. It was found, however, that the channelling effect is pronounced for low-index zone-axis orientations, yielding a method for assessing site occupancies that is rapid and easy to perform.

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Rossouw, Chris. "The Role of Simulation in ALCHEMI." Microscopy and Microanalysis 7, S2 (August 2001): 352–53. http://dx.doi.org/10.1017/s1431927600027835.

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Contrast in zone axis channelling patterns, formed by variations in characteristic X-ray emission rates as an electron beam is scanned in angle, is related to projected sublattice site symmetries of ionized atoms within the unit cell. Whereas overall Brillouin zone geometry is identical to that observed in large angle convergent beam patterns, this incoherent X-ray channelling contrast is related to ADF or BSE contrast by integration over thickness of the signal generated within the specimen. Contrast is thus relatively stable and easily interpretable.1 This is useful in separating the response of dilute atoms from abundant atomic species, since the specific channelling pattern of each atom has its own overall fingerprint. Correlation of patterns formed from Ta-doped TiAl with bright field LACBED is shown in Fig. 1 (clearly Ta occupies Ti sublattice sites). No simulation of channelling contrast is necessary if minority atomic species are distributed over sublattice sites in a way that can be reconstructed from a linear superposition of majority (or host) atom sites that form part of the regular lattice structure. The distribution over sublattice sites may be determined by any one of a variety of analysis methods.2,3

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3

SHINDO, Daisuke. "Atom location by channelling enhanced microanalysis." Nihon Kessho Gakkaishi 29, no. 4 (1987): 301–4. http://dx.doi.org/10.5940/jcrsj.29.301.

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4

Shindo, Daisuke. "Principle and application of ALCHEMI(atom location by channelling enhanced microanalysis)." Bulletin of the Japan Institute of Metals 29, no. 7 (1990): 511–18. http://dx.doi.org/10.2320/materia1962.29.511.

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5

Oxley, M. P., L. J. Allen, and C. J. Rossouw. "Correction terms and approximations for atom location by channelling enhanced microanalysis." Ultramicroscopy 80, no. 2 (October 1999): 109–24. http://dx.doi.org/10.1016/s0304-3991(99)00101-1.

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6

Sarosi, P. M., J. A. Hriljac, and I. P. Jones. "Atom location by channelling-enhanced microanalysis and the ordering of Ti2AlNb." Philosophical Magazine 83, no. 35 (December 2003): 4031–44. http://dx.doi.org/10.1080/14786430310001603472.

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7

Marceau, Ross K. W., Ivan Gutierrez-Urrutia, Michael Herbig, Katie L. Moore, Sergio Lozano-Perez, and Dierk Raabe. "Multi-Scale Correlative Microscopy Investigation of Both Structure and Chemistry of Deformation Twin Bundles in Fe–Mn–C Steel." Microscopy and Microanalysis 19, no. 6 (October 8, 2013): 1581–85. http://dx.doi.org/10.1017/s1431927613013494.

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AbstractA multi-scale investigation of twin bundles in Fe–22Mn–0.6C (wt%) twinning-induced plasticity steel after tensile deformation has been carried out by truly correlative means; using electron channelling contrast imaging combined with electron backscatter diffraction, high-resolution secondary ion mass spectrometry, scanning transmission electron microscopy, and atom probe tomography on the exact same region of interest in the sample. It was revealed that there was no significant segregation of Mn or C to the twin boundary interfaces.

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8

Van Dyck, D. "A Simple Real-Space Channelling Theory for Electron Diffraction and HREM." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (August 12, 1990): 64–65. http://dx.doi.org/10.1017/s0424820100179075.

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The computation of the many beam dynamical electron diffraction amplitudes or high resolution images can only be done numerically by using rather sophisticated computer programs so that the physical insight in the diffraction progress is often lost. Furthermore, it is not likely that in this way the inverse problem can be solved exactly, i.e. to reconstruct the structure of the object from the knowledge of the wavefunction at its exit face, as is needed for a direct method [1]. For this purpose, analytical expressions for the electron wavefunction in real or reciprocal space are much more useful. However, the analytical expressions available at present are relatively poor approximations of the dynamical scattering which are only valid either for thin objects ((weak) phase object approximation, thick phase object approximation, kinematical theory) or when the number of beams is very limited (2 or 3). Both requirements are usually invalid for HREM of crystals. There is a need for an analytical expression of the dynamical electron wavefunction which applies for many beam diffraction in thicker crystals. It is well known that, when a crystal is viewed along a zone axis, i.e. parallel to the atom columns, the high resolution images often show a one-to-one correspondence with the configuration of columns provided the distance between the columns is large enough and the resolution of the instrument is sufficient. This is for instance the case in ordered alloys with a column structure [2,3]. From this, it can be suggested that, for a crystal viewed along a zone axis with sufficient separation between the columns, the wave function at the exit face does mainly depend on the projected structure, i.e. on the type of atom columns. Hence, the classical picture of electrons traversing the crystal as plane-like waves in the directions of the Bragg beams which historically stems from the X-ray diffraction picture, is in fact misleading.

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9

Oxley, M. P., and L. J. Allen. "ICSC: a program for calculating inelastic scattering cross sections for fast electrons incident on crystals." Journal of Applied Crystallography 36, no. 3 (May 20, 2003): 940–43. http://dx.doi.org/10.1107/s0021889803002875.

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A computer program which calculates inner-shell ionization and backscattering cross sections for fast electrons incident on a crystal is presented. The program calculates the inelastic scattering coefficients for inner-shell ionization, pertinent to electron energy loss spectroscopy and energy dispersive X-ray analysis, using recently presented parameterizations of the atomic scattering factors. Orientation-dependent cross sections, suitable for atom location by channelling enhanced microanalysis, may be calculated. Inelastic scattering coefficients that allow the calculation of orientation-dependent annular dark-field and Rutherford backscattering maps are calculated using an Einstein model. In all cases, absorption due to thermal diffuse scattering, also calculated using an Einstein model, can be included.

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10

Nakata, Y., T. Tadaki, and K. Shimizu. "Determination of the Atom Location of Ni in Cu-Al-Ni Alloys by the Channelling Enhanced Microanalysis Method." Materials Science Forum 56-58 (January 1991): 429–34. http://dx.doi.org/10.4028/www.scientific.net/msf.56-58.429.

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Book chapters on the topic "Atom channelling"

1

Balykin†, V. I., V. S. Letokhov, and Yu Β. Ovchinnikov. "Channelling of atoms in a standing laser light wave." In Frontiers in Nonlinear Optics, 1–16. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003209638-1.

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2

Yagi, E. "Behaviour of Krypton Atoms Implanted into Aluminium as Investigated by a Channelling Method." In Fundamental Aspects of Inert Gases in Solids, 257–64. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-3680-6_22.

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