2912.     RÖTTIG, E. [New Substances With Spinel Structure.]  Angew. Chem., vol. 62, 1950, p.87.

        CuFe₅O₈, analogous to LiAl₅O₈ and LiFe₅O₈, was made at 1,200° C.  Its θ=390° and a=8.389±0.003 Å.  This is a spinel.  CuFe₂O₄, made at 600°, has θ=490° and is psuedo-tetragonal with a=8.4₄ Å, c/a=0.97₅. 

                                  Cu+Fe

        Mixtures of CuFe₂O₄ and       2      Fe₂O₄ have θ=440° and a spinel structure with a=8.377±0.003 Å.  CuAl₅O₈ is not quite cubic.  CuAl₂O₄ and CuCr₂O₄ are not cubic, contrary to the literature.  Li⁺, Cu⁺, or Ti⁴⁺ spinels could not be obtained.  LiFeTiO₄ and LiCrTiO₄ are spinels.  LiAlTiO₄ is not cubic.  LiFeTiO₄ is ferromagnetic with θ=130°.

        ROUDEBUSH, B.  See abs. 626.