Cerium monosulfide

Cerium monosulfide is a binary inorganic compound of cerium and sulfur with the chemical formula CeS. This is the simplest of cerium sulfides.

Synthesis

Reduction reaction of dicerium trisulfide and cerium hydride:
Reacting cerium metal and sulfur in a planetary ball mill:
Physical properties

Cerium sulfide forms golden cubic crystals, with space group Fmm and lattice parameter a = 5.763 Å. It has a NaCl-type structure.
The compound melts congruently at a temperature of 2450 °C, the highest out of any known sulfide.

Chemical properties

Cerium monosulfide has a wetting effect on metals, and it is relatively stable to metals other than platinum. It can react violently with platinum to form an intermetallic compound, platinum cerium.