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The structure of decagonal Al-Cu-Rh has been studied as a function of temperature by in-situ single-crystal X-ray diffraction in order to contribute to the discussion on energy or entropy stabilization of quasicrystals. The experiments were performed at 293, 1223, 1153, 1083 and 1013 K. A common subset of 1460 unique reflections was used for the comparative structure refinements at each temperature. A comparison of the high-temperature datasets suggests that the best quasiperiodic ordering should exist between 1083 and 1153 K. However, neither the refined structures nor the phasonic displacement parameter vary significantly with temperature. This indicates that the phasonic contribution to entropy does not seem to play a major role in the stability of this decagonal phase in contrast to other kinds of structural disorder, which suggests that, in this respect, this decagonal phase would be similar to other complex intermetallic high-temperature phases.
Supporting information
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThickRhomb_293Ksup1.cif CIF file of the Thick Rhomb decoration at 1013 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThickRhomb_1013Ksup2.cif CIF file of the Thick Rhomb decoration at 1083 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThickRhomb_1083Ksup3.cif CIF file of the Thick Rhomb decoration at 1153 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThickRhomb_1153Ksup4.cif CIF file of the Thick Rhomb decoration at 1223 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThickRhomb_1223Ksup5.cif CIF file of the Thick Rhomb decoration at 293 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThinRhomb_293Ksup6.cif CIF file of the Thin Rhomb decoration at 1013 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThinRhomb_1013Ksup7.cif CIF file of the Thin Rhomb decoration at 1083 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThinRhomb_1083Ksup8.cif CIF file of the Thin Rhomb decoration at 1153 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThinRhomb_1153Ksup9.cif CIF file of the Thin Rhomb decoration at 1223 K |
| Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_ThinRhomb_1223Ksup10.cif CIF file of the Thin Rhomb decoration at 293 K |
| Structure factor file (CIF format) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_293Ksup11.hkl List of observed and calculated structure factors, phases, and extinction coefficients at 1013 K |
| Structure factor file (CIF format) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_1013Ksup12.hkl List of observed and calculated structure factors, phases, and extinction coefficients at 1083 K |
| Structure factor file (CIF format) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_1083Ksup13.hkl List of observed and calculated structure factors, phases, and extinction coefficients at 1153 K |
| Structure factor file (CIF format) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_1153Ksup14.hkl List of observed and calculated structure factors, phases, and extinction coefficients at 1223 K |
| Structure factor file (CIF format) https://doi.org/10.1107/S2052520613032575/dq5003AlCuRh_1223Ksup15.hkl List of observed and calculated structure factors, phases, and extinction coefficients at 293 K |
| Portable Document Format (PDF) file https://doi.org/10.1107/S2052520613032575/dq5003sup16.pdf Additional graphs and electron density maps for all refined structures |
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