215. BERTAUT, F., BOCHIROL, L., AND BLUM, P. [Synthesis and Space Groups of the Boroferrites.] Compt. rend., vol. 230, 1950, pp. 764-765; Chem. Abs., vol. 44, 1950, p. 5749.

215. BERTAUT, F., BOCHIROL, L., AND BLUM, P. [Synthesis and Space Groups of the Boroferrites.] Compt. Rend., vol. 230, 1950, pp. 764-765; Chem. Abs., vol. 44, 1950, p. 5749.

Boroferrites of the composition A.4MO, where A=Fe₂O₃ or B₂O₃ and M=Ni, Co, or Cu, were prepared by dissolving the oxides in alkali borates and slowly cooling the solutions. Acidification with HNO₃ gave long, crystalline needles. The unit crystal contains 2 mol. of A.4MO; the lattice parameters are given. Boroferrites of the composition A.2MO (M=Mg, Fe, Co, or Ni) are all paramagnetic at ordinary temperature.