The crystal structure and ferrimagnetism of yttrium-iron garnet, Y3Fe2(FeO4)3

A procedure for parameter refinement in simple structures

“…It is a cubic crystal and many pairs of independent reflections occur at the same Bragg angle. The parameters have recently been determined by Geller &Gilleo (1957 and1959) with satisfactory precision and these could be used as a starting point for this work. Good single crystals, prepared by Microwave Chemicals, Inc., were available, and two of these were readily ground to spherical shape.…”

“…the x, y and z coordinates of one oxygen atom. Geller &Gilleo (1957 and1959) and, more recently, Wiedenborner (1961) in his work on the structure of the isomorphous gadolinium iron garnet, have based their analyses on reflections to which oxygen atoms make major contributions. These are of two types: first, those to which only the oxygen atoms contribute, and second, those which receive, in addition to oxygen contributions, contributions from metal atoms in positions 24(c) and 24(d).…”

The Second Order Magnetoelectric Effect in Yttrium Iron Garnet

“…is m3m, and the magnetic point group is -5m (Geller & Gilleo (1957) A chosen facet was indexed at first to decide whether or not it was usable. This was effected by using a Laue x-ray back reflection technique.…”

“…In order to understand the effects of electric fields applied to the crystal, the form of the crystalline electric fields of the magnetic ions must be known. This crystal field will depend upon the ionic structure of the garnet, which has been described in detail by Geller & Gilleo (1957). The garnet lattice is cubic and belongs to the classical space group Ia3d and magnetic, space group state of higher multiplets which are split by the crystal field.…”

Temperature Evolution of the Double Umbrella Magnetic Structure in Terbium Iron Garnet

“…The rare earth iron garnets RE 3 Fe 5 O 12 (REIG hereafter) have been discovered at Grenoble (France) (Bertaut & Forrat, 1956;Bertaut et al, 1956) then independently at Murray Hill (USA) (Geller & Gilleo, 1957a, 1957b. These most studied ferrimagnetic materials have a general formula {RE 3+ 3 }[Fe 3+ 2 ](Fe 3+ 3 )O 12 where RE 3+ can be any trivalent rare earth ion or the Yttrium Y 3+ .…”