High external pressure rearranges t

High external pressure rearranges the particles, and the liquid fills the pores between them due to the capillary effect leading to an initial densification. The next step is heating the compact under uniaxial pressure to temperatures below 400°C. Under heating, the solution evaporates and a supersaturation solution is obtained. At this stage, precipitation of supersaturated solution occurs and a higher level of densification is achieved via dissolution‐precipitation process. These precipitations are usually amorphous, and a postannealing is required to ensure their crystallinity and further densification. The CSP has been successfully performed for various oxides such as ZnO,14 Y2O3‐stabilized ZrO2,15 V2O5,16 AMo2O7 (A: Li, Na, and K),12,17‒19 BaTiO3,13,20 and other salts and compounds far below their conventional sintering temperature.