Abstract
Application of high-pressure high-temperature conditions (3.5 GPa at 1673 K for 5 h) to mixtures of the elements ( RE:B:S=1:3:6) yielded crystalline samples of the isotypic rare earth–thioborate–sulfides RE 9[BS 3] 2[BS 4] 3S 3, ( RE=Dy–Lu), which crystallize in space group P6 3 ( Z=2/3) and adopt the Ce 6Al 3.33S 14 structure type. The crystal structures were refined from X-ray powder diffraction data by applying the Rietveld method. Dy: a=9.4044(2) Å, c=5.8855(3) Å; Ho: a=9.3703(1) Å, c=5.8826(1) Å; Er: a=9.3279(12) Å, c=5.8793(8) Å; Tm: a=9.2869(3) Å, c=5.8781(3) Å; Yb: a=9.2514(5) Å, c=5.8805(6) Å; Lu: a=9.2162(3) Å, c=5.8911(3) Å. The crystal structure is characterized by the presence of two isolated complex ions [BS 3] 3– and [BS 4] 5– as well as [□(S 2–) 3] units.
Published Version
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