Fabrication of Transparent Yttria by High‐Pressure Spark Plasma Sintering

Abstract

Transparent yttria was prepared by means of high‐pressure spark plasma sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in‐line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near‐infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high‐pressure spark plasma sintering for fabricating transparent yttria.