Magnetic and Crystallographic Studies of Ferrimagnetic Garnets Containing Fluorine

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Magnetic and crystallographic data are reported on the systems {Y_<3-x>Ca_x}Fe_5O_<12-x>F_x and {Y_<3-x>Ca_<3x>}Fe_<5-x>M_xO_<12-x>F_x, where M=Sb or V. A single phase can be obtained for x up to 0.56 in the system {Y_<3-x>Ca_x} Fe_5O_<12-x>F_x, and for x up to 0.55, 0.50 in the system {Y_<3-3x>Ca_<3x>}Fe_<5-x>M_xO_<12-x>F_x for M=Sb and V, respectively. The spontaneous magnetic moments extrapolated to 0°K agree quantitatively with those calculated on the basis of the Neel model. From measurements of the Curie temperature, the magnitude of the Fe^<3+>-F^--Fe^<3+> exchange interaction estimated from a modified molecular field theory is in fairly good agreement with that in FeF_3. The ferrimagnetic resonance line width at X-band in the single phase region increases with F content, but the g-factor is almost constant.
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1966-06-15