Ferrimagnetic Garnets Containing Pentavalent Vanadium

Abstract

In a recent publication, magnetic data were reported on the newly discovered garnet {Ca₃}[Fe₂](Fe_1.5V_1.5)O₁₂. In this paper, magnetic and crystallographic data on garnets in the systems {M_3−2xCa_2x} [Fe₂](Fe_3−xV_x)O₁₂, M≡Y or Bi, are reported. It appears that for all values of x, 0<x≤1.5, Curie temperatures are higher than would have been expected. Up to x≅0.7, the Curie temperatures are equal to or slightly greater than that of yttrium iron garnet 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. The full‐length paper with the above title has been published.