Magnetic and crystallographic data are reported on the systems Y₃CoₓFe_5-2xMₓO₁₂, M=SiorGe. When M=Si, the maximum value of x appears to be between 1.00 and 1.25, while when M=Ge, the maximum value of x is 2.50. A distribution of the ions in these garnets is proposed that is compatible with the results and conclusions obtained on all other substituted yttrium-iron-garnet systems. In particular, it appears that a constant 20% of the Co²⁺ ions enter tetrahedral sites. When x≥1.00, some Ge⁴⁺ ions enter octahedral sites. The garnet {Y2.7{Ca}0.3Co{Fe}2.7Ge1.3{O}₁₂$ has a compensation point at 236^∘{}K; it is the first garnet reported which has a compensation point resulting from a difference in the temperature behavior of only the a and d sublattice magnetizations. The other garnets having compensation points all contain magnetic rare-earth ions in the c sites. The garnet {Y2.5{Ca}0.5Co{Fe}₃V0.5{Ge}0.5O₁₂ has a higher Curie temperature, 410^∘{}K, than that, 350^∘{}K, of {Y₃}CoFe₃GeO₁₂. This is in accord with the expected effect of pentavalent vanadium substitution.
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Geller et al. (1964) studied this question.