1055. FORRESTIER, H., AND GUIOT-GUILLAN, G. [A New Series of Ferromagnetic Substances; the Ferrites of the Rare Earths.] Compt. rend., vol. 230, 1950, pp. 1844-1845; Chem. Abs., vo0l. 44, 1950, p. 7700.

1055. FORRESTIER, H., AND GUIOT-GUILLAN, G. [A New Series of Ferromagnetic Substances; the Ferrites of the Rare Earths.] Compt. Rend., vol. 230, 1950, pp. 1844-1845; Chem. Abs., vo0l. 44, 1950, p. 7700.

Compounds of the type Fe₂O₃·M₂O₃, where M is La, Pr, Nd, Sm, Er, or Y, were prepared by coprecipitation of the oxides followed by heat treatment. They are stable up to 1,000°, although in some cases decomposition occurs after prolonged heating of 1,000°. Magnetization curves were obtained. Ferromagnetic Curie points are: Fe₂O₃·La₂O₃, 465°; Fe₂O₃·Pr₂O₃ 425°; Fe₂O₃ Nd₂O₃, 300°; Fe₂O₃·Sm₂O₃, 300°; Fe₂O₃·Er₂O₃, 255°; Fe₂O₃·Y₂O₃, 275°.