Magnetic Properties of the Mixed Garnets(3−x)Y2O3·xGd2O3·5Fe2O3

Polycrystalline garnets of the form $\mathrm{}(3-x)\mathrm{}{\mathrm{Y}}_2{\mathrm{O}}_3·x{\mathrm{Gd}}_2{\mathrm{O}}_3·5{\mathrm{Fe}}_2{\mathrm{O}}_3$ have been prepared for several values of $x$ ranging from 0 to 3. Lattice constants vary linearly from 12.374±0.005 A for yttrium-iron garnet ($x=0\mathrm{}$) to 12.463±0.005 A for gadolinium-iron garnet ($x=3\mathrm{}$). Magnetic moments were measured from 77°K to 580°K. For $0<x<\mathrm{}0.73\mathrm{}$, the magnetization decreases as $x$ increases, the decrease being more pronounced at low temperatures. At $x\sim 0.73$, a compensation point occurs near absolute zero. This compensation point appears at increasingly higher temperatures as $x$ increases beyond 0.73, until it reaches ∼287°K for $x=3\mathrm{}$. The magnetic moments for the members of the series show reasonable agreement with values calculated on the basis of the Néel theory.