2215.     MAXWELL, L. R., AND BRUNAUER, S.  Thermomagnetic Investigations of Promoted Iron Oxide and Iron Catalysts.  Phys. Rev., vol. 76, 1949, p. 175, abstract L7.

        Curie point and specific magnetization of singly and doubly promoted catalysts were determined.  Singly:  Fe₃O₄+Li₂O, Na₂O, K₂O, Cs₂O, CaO, BaO, B₂O₃, Al₂O₃, SiO₂.  Curie point virtually unchanged, but specific magnetization reduced nearly 50% upon adding 1.7% by weight of BaO.  Doubly:  Fe₃O₄ and Al₂O₃+Li₂O, Na₂O, K₂O, MgO, CaO, BaO, SiO₂.  Curie point varied only slightly and was >Curie point of Fe₃O₄.  Large reductions of specific magnetization were observed.  Some of these, reduced in H₂ behaved like pure Fe.