Substitution of gadolinium, aluminium, and indium in yttrium calcium vanadium garnets

The effect of Gd, In, and Al substitution on magnetic and resonance properties in the system {Y3-2x-aCa2xGda} [Fe2-zInz]- (Fe3-x-yVxAly)O12is reported for0.5 \leq x \leq 0.9, 0 \leq a \leq 1.1, 0 \leq y \leq 0.8, andz = 0, 0.5. It is shown that compositions exist in this system that display improvements over conventional garnets in this respect to temperature stability andX-band resonance linewidth. The series Y3-2xCa2xFe4.75-xVxIn0.25O12is suggested as one such optimal series of compositions.