Abstract
Lattice parameters as a function of temperature for, and atomic coordinates of the low-temperature phase of, SrMo6S8 are reported from X-ray powder diffraction. The structure transforms atT 1=135(3) K from the rhombohedral high-temperature modification (R\(\bar 3\),a rh=6.5630 (3) Å, αrh=88.9982(2)°,V rh=282.55(5)Å3 at 298 K) into the triclinic low-temperature modification (P\(\bar 1\),a tr=6.481(1)Å,b tr=6.572(1)Å,c tr=6.611(1)Å, αtr=89.246(4)°, βtr=89.304(4)°, γtr=88.169(4)°,V tr=281.4(2)Å3 at 20K). The triclinic distortion is larger than in the Ca analogue, and similar to the Ba and Eu analogues.
Zusammenfassung
Die Temperaturabhängigkeit der Gitterparameter und die Atomlagen der Tieftemperaturphase von SrMo6S8 wurden mittels Röntgenpulverdiffraktometrie bestimmt. Die rhomboedrische Hochtemperaturmodifikation (R\(\bar 3\),a rh=6.5630(3)Å, αrh=88.9982(2)°,V rh=282.55(5)Å3,T=298 K) wandelt beiT 1=135(3) K in die trikline Tieftemperaturmodifikation (P\(\bar 1\),a tr=6.481(1)Å,b tr=6.572(1)Å,c tr=6.611(1)Å, αtr=89.246(4)°, βtr=89.304(4)°, γtr=88.169(4)°,V tr=281.4(2)Å3,T=20 K) um. Die trikline Deformation ist stärker ausgeprägt als in der Ca-Verbindung und ähnlich jener der Ba- and Eu-Verbindung.
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Koppelhuber-Bitschnau, B., Mautner, F.A. & Yvon, K. Low-temperature structural phase transition in SrMo6S8 studied by X-ray powder diffraction. Monatsh Chem 121, 505–509 (1990). https://doi.org/10.1007/BF00810858
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DOI: https://doi.org/10.1007/BF00810858