The incommensurately modulated non-stoichiometric ytterbium sulphide phase Yb<sub>3-δ</sub>S<sub>4</sub>
R L Withers; B G Hyde; A Prodan; F W Boswell; R L Withers; Res. Sch. of Chem., Australian Nat. Univ., Canberra, ACT, Australia; B G Hyde; Res. Sch. of Chem., Australian Nat. Univ., Canberra, ACT, Australia; A Prodan; Res. Sch. of Chem., Australian Nat. Univ., Canberra, ACT, Australia; F W Boswell; Res. Sch. of Chem., Australian Nat. Univ., Canberra, ACT, Australia
Журнал:
Journal of Physics: Condensed Matter
Дата:
1990-05-07
Аннотация:
The extinction conditions associated with the observed incommensurate satellite reflections of the low (i.e. <or approximately=1400 degrees C) specimen preparation temperature Yb<sub>3- delta </sub>S<sub>4</sub> phase are used to provide a crystallographic description of this modulated structure. The superspace group is found to be P<sub>11s</sub><sup>Pnma</sup> if the primary modulation wave-vector is chosen to fall inside the first Brillouin zone of the average structure.
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