| abstract |
This invention provides a light-transparent material that is high in space filling ratio and, less likely to cause light scattering, and has excellent light transmittance. After the synthetic of particles by liquid phase synthesis, the solution is replaced without drying the particles, and a solution comprising a composition of a grain boundary phase or a liquid containing a precipitate of at least one member selected from Al2O3, yttrium oxide, silicon oxide, yttrium-silicon composite oxide, aluminum-silicon composite oxide, or compounds having a garnet structure with a melting point below the melting point of the above particles is introduced. The solution comprising a composition of a grain boundary phase or a precipitate-containing liquid is deposited and grown on the surface of particles to prepare activated fine particles, and the activated fine particles are three-dimensionally arranged in a solution to provide a formed product which is then sintered. |