| abstract |
A method for manufacturing a transparent sesquioxide sintered body in which seismic transparent M 2 O 3 type sesquioxide sintered bodies can be manufactured in a stable manner is provided. Powders comprising at least one rare earth element oxide and Zr oxide particles selected from the group consisting of Y, Sc and lanthanide elements are prepared as raw powders, wherein the particle size distribution of rare earth element oxide particles, or rare earth When elemental oxide particles are aggregated to form secondary particles, in the particle size distribution of secondary particles, the particle size D 2.5 value in which the cumulative particle amount is 2.5% based on the total particle amount in the minimum particle size range is from 180 nm to 2000 nm. . The raw material powder is press-molded into a predetermined shape and then sintered to produce a transparent M 2 O 3 type sesquioxide sintered body (M is at least one rare earth element selected from the group consisting of Y, Sc and lanthanide elements). |