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.
Bibliographical noteFunding Information:
This research was supported by the US National Science Foundation under Grant DMR00-96676 (J.A.I), a Ford Predoctoral Fellowship to K.M., and a Northwestern University Presidential Fellowship to C.L.H. Use was made of the MRL Central Facilities supported by the National Science Foundation at the Materials Research Center of Northwestern University under Grant No. DMR00-76097.
- Band gap
- Cerium manganese oxyselenide
- Synthesis and X-ray structure