In this work, we report the particle size and compositional results obtained during the incorporation of polyvinyl alcohol in the regrind of an advanced ceramic with NBT (Bi0.5-xNa0.5+x) TiO3 structure, which was synthesized by high-energy mechanical milling. Mechanical milling proved to be a suitable process to synthesize this type of material by obtaining a high purity of the phase. The effect of incorporating polyvinyl alcohol (PVA) as a milling aid after the thermal process was studied. As a result, a particle radius reduction of 48 % was obtained, reaching nanometric sizes. In the study by infrared spectroscopy, it was observed that PVA did not generate bonds with the ceramic, so it is not an agent that modifies the structure of the ceramic.