Yttrium IronGarnet (YIG) is one of magnetic ceramics in son magnet group that has been used for high frequency applications, such as incoaxial junction and 3 port-type circulator. Its empirical formula is usually Y).2XCa2les.x}nyVXOI2.and it can be formed fromseveral metal oxides. The processing technology employed is ceramic technology. That is, to react several oxides with theirelements in powder form. The reaction is solid reaction and occurs at high temperature. The processing steps include mixing ofraw materials, milling, calcination, re-milling with the addition of PYA, characterization, formation or compaction, and sintering.In this research, the effect of milling time of calcin to magnet quality particle size distribution, tinal density, hardness, andmagnetic properties of Yttrium Iron Garnet (YIG) have been studied. Milling time has been varied from 5, 8 to 11 hours.Experimental results showed that the properties of real magnet can be achieved. However, further experiments are needed beconducted to explore the processing condition that can yield Yttrium Iron garnet (YIG) with smaller particle size and higherdensity. So, that higher permeability, higher saturation induction, and lower coercif force can be produced.Key Word: Yttrium Iron Garnet (YIG), milling time, magnet ceramic, son magnet, magnet quality. Endang S.Baronani , Dedi, M. Arifin Hidayat; E-mail: endang@telkoma.lipi.go.id
