The magnetic properties and the lattice parameters for 13 compounds of the composition RIn3 (Cu3Au structure) are reported. The magnetic measurements have been performed between 4.2° and 500°K with magnetic fields up to 30 kOe. With the exception of compounds with R=La, Sm, Y, and Yb Curie–Weiss behavior is observed in the high-temperature region. At low temperatures the magnetic behavior for compounds in which R=Ce, Nd, Sm, Gd, Tb, Dy, Ho, and Er is ascribed to antiferromagnetic ordering. In the case of PrIn3 magnetic ordering is prevented by crystalline fields. The splitting of the J = 4 state of Pr3+ by cubic crystalline fields has been calculated for various combinations of fourth- and sixth-order potentials. Possible energy diagrams are presented.
RbumB. -Un oxyde amorphe de fer 011) a et6 prkpark par dkcomposition thermique d'un akrosol sur un substrat chauffk. Les mesures de la susceptibilitk magnktique montrent une temp&rature de N k l de 80 K. En dessous de 50 K on observe un moment thermo-remanent. Le moment paramagnetique est de 2,5 p~ par ion de fer, indiquant la prksence d'aggrkgats antiferromagnktiques. Les spectres Mijssbauer montrent un doublet paramagnetique au-dessus de 80 K avec un dkplacement isomerique de + 0,15 mmls. En dessous de 80 K une separation hyperfine est observke avec, ?L 5 K, Hhr = 470 kOe et AEQ = 0,11 mmls. 11 en est d6duit que les ions Fe3+ sont entourks par un octakdre dkforrne d'ions W-. Leurs axes de symktrie sont orient& arbitrairement dans la maille apkriodique, laissant une large dispersion des angles v entre Hhn et Vzz.
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