were helpful and are appreciated.The magnetic data obtained through the auspices of Dr. R. M. Bozorth and discussions with him were most helpful.2'Actually the 16{a) position in yttrium-iron garnet is surrounded by an octahedron of oxygen ions which is not regular.The regularity of the octahedra and tetrahedra appears to increase with the ratio of the radii of the ions in the octahedral and tetrahedral sites according to the work of S. C. Abrahams and S. Geller L'Acta Cryst. (to be published) j on grossularite. 7 The high-temperature yttroalumite phase of Voder and Keith {see reference 10) has been identified as perovskite-like YA103 reported by Geller and Bala {see reference 22).
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