Crystallographic studies of perovskite-like compounds. II. Rare earth alluminates

Abstract

The aluminates of the trivalent ions of Gd, Eu, and Sm are isostructural with GdFeO 3. They belong to space group YD~-Pbnm with four distorted perovskite units in the true crystallographic cell. The aluminates of the trivalent ions of Nd, Pr and La are rhombohedral belonging to space group D~d--R3m with two formula units in the unit cell. These crystals bear a very close structural relationship to the orthorhombie ones.