Syntheses and Crystal Structures of the Compounds NaLnTiO4 (Ln = La, Pr, Nd)

Abstract

Single crystals of the NaLnTiO 4 (Ln = La, Pr, Nd) phases were grown out of reactive sodium hydroxide melts. These layered materials crystallize in space group P4/nmm of the tetragonal system, with unit cell dimensions of a = 3.7998(5) Å and c = 13.273(3) Å (La), a = 3.7686(5) Å and c = 12.940(3) Å (Pr), and a = 3.7551(5) Å and c = 12.848(3) Å (Nd). These compounds possess a layered structure that is a variant of K 2 NiF 4 with ordering of the Na and Ln ions.