Structural phase transition of TmGa2 at high pressure
Identifieur interne : 002B86 ( Main/Exploration ); précédent : 002B85; suivant : 002B87Structural phase transition of TmGa2 at high pressure
Auteurs : U. Schwarz [Allemagne] ; S. Br Uninger [Allemagne] ; Yu. Grin [Allemagne] ; K. Syassen [Allemagne]Source :
- Journal of Alloys and Compounds [ 0925-8388 ] ; 1996.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- Ambient, Ambient pressure, Axial ratio, Binary alloys, Bulk modulus, Covalent bonds, Crystal structure, Diffraction diagram, Electron density, Experimental data, Experimental results, Experimental study, First order, Full profile refinements, Fwhm, Gallium alloys, Gallium atoms, Hexagonal, Hexagonal symmetry, High pressure modification, High pressures, Hydrostatic pressures, Interlayer distance, Intermetallic compounds, Linear extrapolation, Metrical changes, Modification, Peak splitting, Phase transition, Phase transitions, Positional parameters, Powder diagrams, Pressure effects, Pressure range, Significant deviations, Structural change, Structural phase transition, Structural properties, Thulium base alloys, Tmga, Transition pressure, Type structure, Unit cell, XRD.
- Teeft :
- Ambient, Ambient pressure, Axial ratio, Bulk modulus, Covalent bonds, Crystal structure, Diffraction diagram, Electron density, Experimental data, Experimental results, First order, Full profile refinements, Fwhm, Gallium atoms, Hexagonal, Hexagonal symmetry, High pressure modification, High pressures, Hydrostatic pressures, Interlayer distance, Linear extrapolation, Metrical changes, Modification, Peak splitting, Phase transition, Positional parameters, Powder diagrams, Pressure range, Significant deviations, Structural change, Structural phase transition, Structural properties, Tmga, Transition pressure, Type structure, Unit cell.
Abstract
Abstract: We have investigated the structural properties of the intermetallic compound TmGa2 under hydrostatic pressures up to 45 GPa by means of X-ray powder diffraction in diamond anvil cells. The orthorhombic low-pressure modification of the KHg2 (CeCu2) type undergoes a structural phase transition at 21(3) GPa into a high-pressure modification of the AlB2 structure type. TB-LMTO-ASA calculations and use of the electron localization function confirm that the structural change from a three-dimensional gallium network to a layered structure is associated with a transition from a tetrahedral homonuclear gallium network to a trigonal planar one.
Url:
DOI: 10.1016/S0925-8388(96)02492-9
Affiliations:
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Le document en format XML
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<term>High pressures</term>
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<term>Peak splitting</term>
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<term>Phase transitions</term>
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<term>Etude expérimentale</term>
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<front><div type="abstract" xml:lang="en">Abstract: We have investigated the structural properties of the intermetallic compound TmGa2 under hydrostatic pressures up to 45 GPa by means of X-ray powder diffraction in diamond anvil cells. The orthorhombic low-pressure modification of the KHg2 (CeCu2) type undergoes a structural phase transition at 21(3) GPa into a high-pressure modification of the AlB2 structure type. TB-LMTO-ASA calculations and use of the electron localization function confirm that the structural change from a three-dimensional gallium network to a layered structure is associated with a transition from a tetrahedral homonuclear gallium network to a trigonal planar one.</div>
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