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High‐Pressure Synthesis, Crystal Structure, and Properties of GdS 2 with Thermodynamic Investigations in the Phase Diagram Gd–S
Author(s) -
Müller Carola J.,
Schwarz Ulrich,
Schmidt Peer,
Schnelle Walter,
Doert Thomas
Publication year - 2010
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201000015
Subject(s) - monoclinic crystal system , crystal structure , crystallography , phase diagram , thermal decomposition , superstructure , materials science , chemistry , phase (matter) , thermodynamics , physics , organic chemistry
Gadolinium disulfide was prepared by high‐pressure synthesis at 8 GPa and 1173 K. It crystallizes in the monoclinic space group P 12 1 / a 1 (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 S 2 2– dumbbells. The thermal decomposition of GdS 2 proceeds via the sulfur‐deficient polysulfides GdS 1.9 , GdS 1.85 and GdS 1.77 and eventually results in the sesquisulfide Gd 2 S 3 . GdS 2 is a paramagnetic semiconductor which orders antiferromagnetically at T N = 7.7(1) K. A metamagnetic transition is observed in the magnetically ordered state.