Single crystals as large as 2 mm of binary transition metal and uranium arsenides and antimonides can be grown from the reactions of titanium, chromium, zirconium, hafnium, tantalum, rhenium, or uranium with alkali metal arsenides and antimonides from 500 degrees C to 950 degrees C. Single crystals of the ternary uranium copper arsenide phases UCuAs2 and U2Cu4As5 can also be grown from the reaction of uranium and copper with Cs3As7. The resulting crystals were analyzed by electron dispersive analysis by X-rays (EDX) and single crystal X-ray diffraction.