Products of the zirconium powder reaction with amorphous boron in a NaBO ionic melt at 650-850°C and those of the ZrCl reaction with NaBH at 300-725°C have been studied by means of X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry, and elemental analysis. At temperature ≥750°C, single-phase ZrB with the particle size of 60-80 nm is formed in a NaBO ionic melt, whereas the ZrB powder obtained via the reaction of ZrCl with NaBH at temperature ≥575°C consists of particles differing in the shape, some of which are close to spherical with diameter of 10-35 nm. [ABSTRACT FROM AUTHOR]