There are only a few multiferroic compounds, among which BiFeO 3 is the most important. Research the synthesis of bismuth ferrite, with novel and improved magnetic and electrical properties, has been mainly based on the use of hydrothermal or sol gel methods. However, these methods require either rather extreme conditions or several steps for synthesis. We demonstrate that the use of molten salts, activated by high energy milling, results in pure nanometric BiFeO 3 , LaFeO 3 and intermediate phases in the Bi 1− x La x FeO 3 system. The chemical reagents used are Bi(NO 3 ) 3 ⋅5H 2 O, La(NO 3 ) 3 ⋅6H 2 O, Fe(NO 3 ) 3 ⋅9H 2 O and NaOH. A brief milling process of the reagents creates an amorphous precursor and crystalline NaNO 3 . The thermal treatment of the precursors, at 500°C for two hours, produces a crystalline mixture of Bi 1− x La x FeO 3 and NaNO 3 . Simple washing eliminates the NaNO 3 . The characterization of intermediates and final products, through thermal analysis, X-ray diffraction and scanning electronic microscopy, allows the inference of possible mechanism. In addition, vibrating sample magnetometry (VSM) and ferroelectric tests show the typical magnetic and electric polarization loops characteristic of these materials even when formed at the nano-scale.