Fabrication of textured cerium‐doped lutetium oxyorthosilicate ceramics by slip casting in a strong magnetic field

Abstract

Cerium‐doped lutetium oxyorthosilicate (Lu2SiO5:Ce, LSO:Ce) slurry with 35 vol.% solid content and viscosity of 70 mPa ·$ \cdot $s (at a shear rate of 4 s–1) was prepared via a 24‐h ball milling for the powder calcined at 1200°C and adding ammonium polyacrylate of 0.2 wt.%. Textured LSO:Ce ceramics were fabricated via slip casting in a vertical magnetic field and subsequently pressureless sintering of 1650°C and hot isostatic pressing. The maximum Lotgering factor f and relative density of the textured ceramics were 0.48% and 98.8%, respectively. Effects of grain size, dispersant, viscosity of slurry, and magnetic flux density on the grain orientation of LSO:Ce ceramics were systematically investigated. Based on the spatial state of grains, we proposed the rotation rule that LSO:Ce grains with or without space constraints in the slurry align along a and c‐axis under the induction of a strong magnetic field.

A strategy for low thermal conductivity of lutetium oxyorthosilicate ceramics fabricated via texture engineering

“…Recently, textured LSO ceramics doped with 0.5 at.%Ce 3+ , where most grains are aligned parallel to the [−402] direction, were successfully prepared by slip casting under a strong magnetic field of 9 T. 22 The orientation factor was enhanced via optimizing grain size, mass fraction of dispersant and solid content of slurry. 23 The doping of Ce 3+ changed the magnetic susceptibility of LSO. However, the 4f-orbit of cerium (Ce) contains only one unpaired electron and the total magnetic moment of electrons is very small, which has little effect on the improvement of the magnetic susceptibility of LSO powder.…”

“…Recently, textured LSO ceramics doped with 0.5 at.%Ce 3+ , where most grains are aligned parallel to the [−402] direction, were successfully prepared by slip casting under a strong magnetic field of 9 T 22 . The orientation factor was enhanced via optimizing grain size, mass fraction of dispersant and solid content of slurry 23 . The doping of Ce 3+ changed the magnetic susceptibility of LSO.…”