Ferrimagnetic Garnets Containing Pentavalent Vanadium

Abstract

Magnetic and crystallographic data are reported on the system {Y_3−2xCa_2x} [Fe₂] (Fe_3−xV_x)O₁₂. It appears that for all values of x, 0< x ≤1.5, Curie temperatures are higher than would have been expected. To x≅0.7, the Curie temperatures are equal to or slightly greater than that of yttrium iron garnet (YIG) itself, then decrease gradually to 493°K for {Ca₃} [Fe₂] (Fe_1.5V_1.5)O₁₂. Garnets in the system {Bi_3−2xCa_2x} [Fe₂]‐(Fe_3−xV_x)O₁₂ with 1.5>x>0.8 exist. The magnetic behavior of the garnet {Bi_0.5Ca_2.5} [Fe₂] (Fe_1.75V_1.25)O₁₂ is essentially the same as that of the yttrium analog. Pentavalent vanadium substitution thus provides lower moment garnets with high Curie temperatures and including Bi³⁺ ion substitution, ferrimagnetic garnets not containing rare earths or yttrium.