Permeable sintered rare earth-gallium-garnet and magneto-optical device and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a translucent rare earth-gallium garnet sintered compact having translucency in the range of wavelengths of 600-1, 500 nm except peculiar absorbed wavelengths and its manufacturing method. ŽSOLUTION : By adding Si and Ge of 10-1, 000 wt.ppm in total and ≥5 wt.ppm respectively in terms of metal as a sintering aid to a translucent rare earth-gallium garnet sintered compact represented by general formula R3Ga5O12(wherein R is at least one of rare-earth element in the group consisting of Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu including Y), the linear transparency is made to be 77% or more in the range of wavelengths of 600-1, 500 nm except peculiar absorbed wavelengths and the average diameter of crystal particles is made to be 0.4-3 μm. The sintered compact is manufactured by shaping a shaped body to have a shaped density of ≥55% of theoretical density using a high purity rare earth-gallium garnet powder having purity of ≥99.9%, a binder and Si, Ge raw materials, heat-treating so as to remove the binder, and then firing at 1, 250-1, 450°C for 0.5 h or more in a vacuum. ŽCOPYRIGHT : (C)2009, JPO&INPIT Ž