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Densification behaviour of Y3Fe5O12 materials prepared by microwave sintering process

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3 Author(s)
Lin, C.H. ; Dept. of Mater. Sci. & Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Chang, H.Y. ; Lin, I.N.

The microwave sintering (ms) process is observed to be superior to conventional sintering (cs) in the densification of Y3Fe5O12 materials. A density of 97.3% theoretical density (T.D.) with pure garnet phase and small grain size (5~7 μm) was obtained for materials microwave sintered at 1300°C for 20 minutes. By contrast, only 94.3% of T.D. can be reached for materials sintered by conventional processing at 1425°C for 8 h and the grains are large (~25 μm). A higher densification rate in the microwave sintering process, as compared with that in conventional sintering processing, is ascribed to the lower activation energy of densification (i.e., (Ea)ms=83.3 kcal/mol and (E a)cs=163.2 kcal/mol). On the other hand, small grain size in microwave sintered samples is attributed to the fact that the (Ea)ms-value is smaller than the activation energy of grain boundary migration (Eg=94.8 kcal/mol)

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Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 5 )