| 摘要 |
PURPOSE:To obtain the titled garnet single crystal easy to grow and having high light-transmittance and uniform characteristics over the whole crystal, by using a Y-iron garnet composition containing a specific amount of Mn ion. CONSTITUTION:A Y-iron garnet (YIG) single crystal is produced e.g. by TSFZ process as follows. Y2O3, Fe2O3 and Ga2O3 each having a purity of >=99.9% are weighed at a ratio Y2O3:(Fe2O3+Ga2O3)=3.5 to obtain a YIG raw material. The YIG raw material is added and mixed with Mn or Mn and one or more Ni, Co, Cu and Cr ions at a molar ratio of 0.1X10<-3>-9.3X10<-3> and the mixture is formed and sintered at >=1,500 deg.C in oxygen atmosphere. The sintered rod of the raw material and a seed crystal are placed in a focused infrared heating furnace inserting a solvent material between the raw material and the seed crystal and melted by heating to form a floating zone. The sintered raw material rod and the seed crystal are rotated usually in opposite directions and transferred at a speed of <=1.0mm/hr to obtain the objective YIG single crystal.
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