Cerium phosphide is an inorganic compound with the chemical formula CeP. It is one of the phosphides of cerium. It can be obtained by reacting cerium dioxide and phosphine at 1300 ðC in the presence of hydrogen, or by reacting sodium phosphide and cerium chloride at 700~800 ðC. It will be oxidized to monoclinic CePO<sub>4</sub> in air above 900 ðC. It reacts with iodine in a quartz ampoule to obtain CeSiP<sub>3</sub>.