Ru3B is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ru(1) is bonded to eight equivalent Ru(1) and four equivalent B(1) atoms to form distorted RuB4Ru8 cuboctahedra that share corners with four equivalent B(1)Ru12 cuboctahedra, corners with fourteen equivalent Ru(1)B4Ru8 cuboctahedra, edges with six equivalent B(1)Ru12 cuboctahedra, edges with twelve equivalent Ru(1)B4Ru8 cuboctahedra, faces with four equivalent B(1)Ru12 cuboctahedra, and faces with sixteen equivalent Ru(1)B4Ru8 cuboctahedra. B(1) is bonded to twelve equivalent Ru(1) atoms to form BRu12 cuboctahedra that share corners with six equivalent B(1)Ru12 cuboctahedra, corners with twelve equivalent Ru(1)B4Ru8 cuboctahedra, edges with eighteen equivalent Ru(1)B4Ru8 cuboctahedra, faces with eight equivalent B(1)Ru12 cuboctahedra, and faces with twelve equivalent Ru(1)B4Ru8 cuboctahedra.
Ru3B is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ru(1) is bonded to eight equivalent Ru(1) and four equivalent B(1) atoms to form distorted RuB4Ru8 cuboctahedra that share corners with four equivalent B(1)Ru12 cuboctahedra, corners with fourteen equivalent Ru(1)B4Ru8 cuboctahedra, edges with six equivalent B(1)Ru12 cuboctahedra, edges with twelve equivalent Ru(1)B4Ru8 cuboctahedra, faces with four equivalent B(1)Ru12 cuboctahedra, and faces with sixteen equivalent Ru(1)B4Ru8 cuboctahedra. There are a spread of Ru(1)-Ru(1) bond distances ranging from 2.53-2.79 Å. There are two shorter (2.50 Å) and two longer (2.66 Å) Ru(1)-B(1) bond lengths. B(1) is bonded to twelve equivalent Ru(1) atoms to form BRu12 cuboctahedra that share corners with six equivalent B(1)Ru12 cuboctahedra, corners with twelve equivalent Ru(1)B4Ru8 cuboctahedra, edges with eighteen equivalent Ru(1)B4Ru8 cuboctahedra, faces with eight equivalent B(1)Ru12 cuboctahedra, and faces with twelve equivalent Ru(1)B4Ru8 cuboctahedra.