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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Magnetic Susceptibility of Pressed Powders of Some Rare-Earth Iron Garnets

  • V. R. Yadava , B. K. Verma , A. K. Tripathi and H. B. Lai


The molar magnetic susceptibilities (χм) of spherical balls of rare-earth iron garnets REIG's, with RE = Y, Gd, Dy, Ho, Er and Yb, prepared from pellets pressed at pressures ranging from 2 to 8 × 107 kg m-2 , have been measured in the temperature range 300-900 K. It is found that χмα exp( - f), where f is the pore fraction of the pressed balls. It has also been observed that χм for a particular garnet at a fixed temperature increases from powder through pressed material to single crystal. REIG's reveal typical ferrimagnetic behaviour with the ferrimagnetic Curie temperature (Tc) lying in the range 550-570 K for single crystals. In general, for pressed material Tc increases linearly with density. The χм-1 vs, T variation has been analysed using molecular field theory. It has been found that for T ≫ Tc the magnetic ions behave as if they were almost free and yield a magneton number very close to their free ion value.

Received: 1982-6-3
Published Online: 2014-6-2
Published in Print: 1982-9-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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