Phase analyses of lanthanide oxide fluorides

Article abstract of DOI:10.1021/ic50072a010

Approximate composition limits and lattice parameters of the rhombohedral and tetragonal phases observed in the system LnO_1-xF_1+2x (Ln = Nd, Gd, Er) are reported. Variation of the c/a ratio of the tetragonal phase with atomic number is noted and discussed. The rhombohedral to cubic transition temperatures of LnO_1-xF_1+2x (Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, Y, Ho, and Er) determined from differential thermal analysis are reported and the transition is discussed. Thermal expansion data are reported for NdOF and its mode of thermal decomposition is indicated.