Crystals of the highly energetic material 4,4′,5,5′-tetraamino-3,3′-bi-1,2,4-triazolium dinitramide (2). This compound is representative for the improvement of thermal stability resulting from the insertion of the long disregarded 4,4′,5,5′-tetraamino-3,3′-bi-1,2,4-triazolium cation.