Abstract
The new quaternary selenide CeMn 0.5OSe has been synthesized by the reaction of Ce, Mn, Se, and SeO 2 at 1223 K. This compound crystallizes in space group P4 /nmm of the tetragonal system with two formula units in a cell of dimensions at 153 K of a=4.0260(7) Å, c=9.107(2) Å. CeMn 0.5OSe has the LaAgOS structure type. It is built from [CeO] fluorite-like layers where Ce 4O tetrahedra share Ce–Ce edges that alternate with [MnSe] anti-fluorite like layers along [001]. An optical band gap of 2.01 eV has been derived from absorption measurements on the (100) crystal face of a CeMn 0.5OSe single crystal.
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