| abstract |
The present invention is based on (a) cerium ions, (b) at least one other rare earth ion selected from cerium ions, cerium ions, and cerium rare earth ions (excluding cerium ions), (c) from the second group In the aqueous solution of the element and the ion of at least one element selected from the group 4 element, the components (a) to (c) are co-precipitated, and the coprecipitate is filtered and heated and dehydrated to produce: a rare earth oxide composed of at least one other rare earth oxide selected from oxides of cerium oxide, cerium oxide, and cerium rare earth element (excluding cerium), and a group 2 element and The raw material powder of the sintering aid composed of the oxide of at least one element selected from the group 4 element, the raw material powder is used to enhance the uniformity of the crystal structure, and the rare earth oxide containing cerium oxide having a small insertion loss is produced. Transparent ceramic. |