Single crystals of U1−xThxSb2 were grown out of an Sb flux using conventional high-temperature solution growth techniques. Small chunks of U, Th, and Sb were mixed together according to the ratio U:Th:Sb = 1 − x:x:11.5. Single crystals were grown by slowly cooling down the U-Th-Sb melt from 1100° to 700°C over 80 hours and then decanting off the excess liquid flux. Identification of commercial equipment does not imply recommendation or endorsement by the National Institute of Standards and Technology (NIST).