Transition metal chalcogenides with the chemical composition of La 3Si0.5Al0.5CuQ7 (Q = S, Se) were synthesized employing traditional high temperature solid-state method. The Si-based parent compound, La3SiCuQ7 crystallizes in an acentric hexagonal space group P63. The crystal structure is composed of one-dimensional chains of trigonal planar [CuQ3]5- units which are arranged in a staggered fashion. In an attempt to induce magnetism to these diamagnetic polar systems, silicon was partially replaced by aluminum to render the copper centers magnetic. The sulfide compounds were isostructural to the parent compound, while the selenides crystallized in a monoclinic superstructure with doubled volume. The sulfides were characterized by single crystal and powder X-ray diffraction with a unit cell of a = 10.7163(3) Å, c = 6.0911(3) Å. The selenides were characterized by powder X-ray refinement with a unit cell of a = 18.499(2) Å, b = 6.1677(1) Å, c = 10.6811(2) Å, and β = 90.013(2)°.
|Commitee:||Bu, Xianhui, Li, Lijuan|
|School:||California State University, Long Beach|
|Department:||Chemistry and Biochemistry|
|School Location:||United States -- California|
|Source:||MAI 55/01M(E), Masters Abstracts International|
|Keywords:||Chemistry, Inorganic, Solid-state synthesis|
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