As previously discussed, the synthe

As previously discussed, the synthesized nanopowders were dried at 400 °C for 1 h to eliminate residual compounds. During cold sintering, the pressure was constantly readjusted and maintained at 300 MPa. Samples with 80 and 40 wt% solids were not suitable for the cold sintering, leading to brittle and unstructured compacts. For 80 wt% solids, the small amount of liquid as medium was insufficient to activate the ‘‘dissolution-reprecipitation” mechanism, hindering the densification process. Moreover, the 40 wt% sample presented a fluid surplus, hampering the pressing control as well as the particles approach. The intermediate condition (60 wt% solids) resulted in a structured, non-brittle compact with a relative density higher than 90%.