Abstract
Addition of 2Ca–V and Bi-species into the yttrium–iron garnet (YIG) materials markedly lowers the sintering temperature necessary for densification of the materials. Sintering temperature ( T s) needed for achieving a density larger than 97% theoretical density (T.D.) decreases from 1425 ° C×6 h for pure YIG to 1280 ° C×6 h for 0.6 (2Ca–V)-doped YIG, (Ca 1.2Y 1.8)(V 0.6Fe 4.4)O 12, CVG. The sintering temperature needed is even lower 1100 ° C×6 h for Bi-doped CVG, (Bi 0.75Ca 1.2Y 1.05)(V 0.6Fe 4.4)O 12. The magnetic properties of these YIG-series materials vary with the sintering temperature pronouncedly, which is ascribed to the change in sintered density with sintering temperature. The addition of Bi-species does not degrade the magnetic and microwave properties of the materials. A low temperature co-firable ceramic material, possessing good microwave magnetic properties has thus been obtained.
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