High‐Pressure Synthesis,Crystal Structure,and Properties of GdS2 with Thermodynamic Investigations in the Phase Diagram Gd–S |
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| Authors: | Carola J. Müller,Ulrich Schwarz,Peer Schmidt,Walter Schnelle,Thomas Doert |
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| Affiliation: | 1. Fachrichtung Chemie und Lebensmittelchemie, Technische Universit?t Dresden, Helmholtzstr. 10, 01062 Dresden, Germany;2. Max‐Planck‐Institut für Chemische Physik fester Stoffe, N?thnitzer Str. 40, 01187 Dresden, Germany |
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| Abstract: | Gadolinium disulfide was prepared by high‐pressure synthesis at 8 GPa and 1173 K. It crystallizes in the monoclinic space group P121/a1 (No. 14) with lattice parameters a = 7.879(1) Å; b = 3.936(1) Å, c = 7.926(1) Å and β = 90.08(1)°. The crystal structure is a twofold superstructure of the aristotype ZrSSi and consists of puckered cationic [GdS]+ double slabs that are sandwiched by planar sulfur sheets containing S22– dumbbells. The thermal decomposition of GdS2 proceeds via the sulfur‐deficient polysulfides GdS1.9, GdS1.85 and GdS1.77 and eventually results in the sesquisulfide Gd2S3. GdS2 is a paramagnetic semiconductor which orders antiferromagnetically at TN = 7.7(1) K. A metamagnetic transition is observed in the magnetically ordered state. |
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| Keywords: | Polysulfides Gadolinium High‐pressure synthesis X‐ray diffraction Phase diagrams |
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