| abstract |
The present invention is a sintered body that has a phase of a compound containing at least a rare earth element and fluorine. In the L*a*b* chromaticity representation, the L* value is 70 or more. Preferably, the average grain size of the crystal grains is 10 μm or less. It is also preferable that the relative density is 95% or more. It is also preferable that the three-point bending strength is 100 MPa or more. It is also preferable that it does not contain oxygen, or when it contains oxygen, the oxygen content is 13% by mass or less. It is also preferable that the above-mentioned compound is a fluoride or oxyfluoride of a rare earth element. |