The bismuth-substituted rare earth iron garnet type using a magneto-optical device and a light-trans

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Alight-transmitting bismuth-substituted rare-earth iron garnet-type calcined body expressed by R 3-x Bi x Fe 5 O 12 and having an average crystal particle diameter of 0.3 - 10 micrometers, and a magneto-optical device using said calcined body ; wherein R is at least one kind of elements selected from a group consisting of Y and lanthanoids, and x is a number from 0.5 to 2.5.