The new quaternary selenide CeMn0.5OSe has been synthesized by the reaction of Ce, Mn, Se, and SeO2 at 1223K. This compound crystallizes in space group P4/nmm of the tetragonal system with two formula units in a cell of dimensions at 153K of a=4.0260(7)Å, c=9.107(2)Å. CeMn0.5OSe has the LaAgOS structure type. It is built from [CeO] fluorite-like layers where Ce4O tetrahedra share Ce-Ce edges that alternate with [MnSe] anti-fluorite like layers along . An optical band gap of 2.01eV has been derived from absorption measurements on the (100) crystal face of a CeMn0.5OSe single crystal.
- Band gap
- Cerium manganese oxyselenide
- Synthesis and X-ray structure