Multiferroic magnetoelectric compounds are highly promising compounds for technologically advanced applications, such as in micro and nano devices development where the importance for synthesizing nanostructured compositions has been significantly increased. One of such materials is the Bismuth Ferrite (BiFeO₃) that has a rhombohedral distorted perovskite structure (ABO₃) and shows ferroelectricity and antiferromagnetism at room temperature. The synthesis of single-phase BiFeO₃ remains a challenge even after many years of research, mainly due to the appearance of secondary phases such as Bi₂₄FeO₃₉ and Bi₂Fe₄O₉. In fact, undesired secondary phases tend to appear when conventional synthesis is used, as in thermally assisted solid-state reaction protocols. In this work, (Bi_1-xLa_x)FeO₃ polycrystal powders were synthesized with La contents that do not induce a space group (R3c) change. The doping was done aiming the structural control, the decrease of the mean grain size and the increase of the ceramics densification ratio. In this way, high-energy ball milling, combined with fast firing protocols followed by quenching to room temperature to achieve phase pure powders, was intensively employed. In sequence, cryomilling (using a home-built setup for cryomill - low temperature high-energy ball-milling process) was used to continuously decrease the particles size until the nanoscale. X-ray diffraction results revealed single-phased samples, while scanning electron microscopy images attested the applicability of the used protocol for processing nanostructured (Bi_1-xLa_x)FeO₃.