BISMUTH SUBSTITUTED RARE EARTH IRON GARNET CRYSTAL, METHOD FOR PRODUCING THE SAME, AND FARADAY ROT

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PROBLEM TO BE SOLVED : To provide a bismuth substituted rare earth iron garnet crystal which substantially contains no lead that is considered to be very harmful, and is excellent in crystal properties, and in which deterioration in light transmittance and Faraday rotation ability is not found when it is used as a Faraday rotator. SOLUTION : The bismuth substituted rare earth iron garnet crystal is represented by a compositional formula : (BiR)3-aM1aFe5-b-c-dAlbPtcM2dO12, wherein, R is one or more elements selected from lanthanoid metals and Y; M1 is one or more elements selected from Ca and Sr; M2 is one or more elements selected from Ge and Si; 0.01

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