Researchers at UCR have developed a simple and efficient transition metal boride synthesis. The transition metal borides are synthesized by directly heating metal chloride and elemental boron in the presence of reducing tin (Sn) between temperatures of 700-900 °C for about eight hours. The resulting transition metal boride products are single-phase nanocrystalline materials with an average size of 100 nm. MoB2, MoB, Mo2B4, Mo2B, CoB, FeB, VB2, NbB, NbB2, TaB2 and WB were all synthesized using this new synthetic method. Fig. 1a shows a sealed quartz tube that was heated to ~800 °C. The pellet at the bottom of the tube contains the desired transition metal boride product. The top of the tube contains crystallized SnCl2. Fig. 1b is an X-ray diffraction (XRD) pattern taken of crystallized SnCl2. Fig. 2a is a comparison of the XRD patterns of MoB2 synthesized by the previously known method of solid state metathesis (red) and the new method described herein (blue). Fig. 2b is a high resolution scanning electron microscope (HRSEM) image of MoB2 synthesized by previously known solid state metathesis (SSM-MoB2) and Fig. 2c shows materials synthesized by the new method. SSM-MoB2 is contaminated by β-MoB and Mo, whereas Sn-MoB2 reaction products are single phase without contamination. HRSEM shows nanospheres and nanorods for SSM-MoB2 and Sn-MoB2, respectively.