Reactive flash sintering in a bilayer of zirconia and lanthana: Measurement of the diffusion coefficient in real time

Reactive flash sintering is a process where off-the-shelf powders of elemental oxides can be simultaneously sintered and reacted to form multicomponent oxide in matter seconds at low furnace temperatures. The fact that several cation species, each residing within their own particles, migrate over distances micrometers, mix on the atomic scale oxides, so quickly, quite remarkable. question arises as rate this solid-state diffusion phenomenon. In paper, we present measurements coefficient from live experiments. results are obtained millimeter bilayers yttria-stabilized zirconia lanthana initiates layer then migrates into layer, forming lanthanum zirconates. velocities migration flash-front, coupled with length profile zirconium interdiffusion, across bilayer interface, provide an estimate effective coefficient. These give value for lie range 2.5 × 10−10 m2 s−1 1380°C, activation energy 200–250 kJ mol−1. comparison, zirconia, 1350°C, stated 1.1 10−20 ∼550 A pause reflection.