Thermodynamic studies in the Ce-Te binary system

•Te vapour pressure determined over Ce-Te samples (∼65–75 at% Te) at 805–1035 K.•Non-stoichiometry in the compound CeTe3 found and redefined in CeTe2.•Partial enthalpy of mixing of Te for CeTe2 intermetallic compound was determined.•Phase boundaries in Ce-Te system were redefined with the measured data. Vapour pressure measurements in the Ce-Te system were carried out employing the isopiestic method. Four sets of isopiestic experimental runs were performed for the temperature range 805 – 1035 K for the composition span from ∼65 to ∼75 at% Te covering the Ce-Te phase diagram region encompassing the intermetallic compounds CeTe2, Ce2Te5 and CeTe3. Activity measurements, partial enthalpy of mixing of tellurium for CeTe2 intermetallic compound and Gibbs energy of the reaction between CeTe2 and Ce2Te5 are reported. A few phase boundaries of the Ce-Te phase diagram were redefined with the measured data and reported.