Using intermediate, liquid-forming compositions in the approach focuses on the Si3N4–R2O3 binary, where R2O3 is any (Y,La)2O3–AlN system as additives, fully dense Si3N4 ceramrare-earth oxide (or Y2O3) used singly or severally. After sinics with high strength at high temperature have been tering, this composition forms -Si3N4 and some refractory rareobtained by pressureless sintering. The cerami...

Highly compact green bodies are usually required to fabricate transparent or translucent polycrystalline yttrium oxide. The present work reports on the fabrication of highly dense (ρrel >98%) Y2O3 from low-density by exploiting a high sinterability nano powder. A commercial Y2O3, with crystallite size ca. 30 nm, was shaped uniaxial pressing and, afterwards, densified pre-sintering at 1500 °C fo...