PARAMAGNETIC GARNET-TYPE TRANSPARENT CERAMIC, MAGNETO-OPTICAL MATERIAL, AND MAGNETO-OPTICAL DEVICE

WIPO Patent Application WO/2023/085107

A1

Provided is a paramagnetic garnet-type transparent ceramic which is truly transparent and has high optical homogeneity, the transparent ceramic being a sintered object of a composite oxide represented by formula (1), containing SiO2 as a sintering aid in an amount larger than 0 mass% but not larger than 0.1 mass%, and having an average sinter-grain diameter of 5 μm or larger. The transparent ceramic has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,064 nm and has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,300 nm.　Formula (1): (Tb1-x-yYxScy)3(Al1-zScz）5O12 (In the formula, 0.05≤x<0.4, 0≤y<0.004, 0.6≤1-x-y<0.95, 0≤z<0.004, and 0.001