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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >High-Pressure Synthesis, Crystal Structure, and Properties of GdS_2 with Thermodynamic Investigations in the Phase Diagram Gd–S
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High-Pressure Synthesis, Crystal Structure, and Properties of GdS_2 with Thermodynamic Investigations in the Phase Diagram Gd–S

机译:相图Gd–S中的热力学研究高压合成,晶体结构和GdS_2的性质

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摘要

Gadolinium disulfide was prepared by high-pressure synthesis at 8 GPa and 1173 K. It crystallizes in the monoclinic space group P12_1/a1 (No. 14) with lattice parameters a = 7.879(1) ?; b = 3.936(1) ?, c = 7.926(1) ? 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 GdS1.77 and eventually results in the sesquisulfide Gd_2S_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.
机译:二硫化是在8 GPa和1173 K下通过高压合成制备的。它在晶格参数a = 7.879(1)?的单斜晶空间群P12_1 / a1(No. 14)中结晶。 b = 3.936(1)?,c = 7.926(1)? β= 90.08(1)°。晶体结构是贵族型ZrSSi的双重上部结构,由褶皱的阳离子[GdS]〜+双层平板组成,夹在中间的含S_2〜(2-)哑铃的平面硫片夹在中间。 GdS_2的热分解通过缺硫的多硫化物GdS_(1.9),GdS_(1.85)和GdS1.77进行,最终生成倍半硫化物Gd_2S_3。 GdS_2是顺磁性半导体,在T_N = 7.7(1)K时反铁磁有序。在磁有序状态下观察到亚磁跃迁。

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