Figure 2
The phase diagram of thiourea. Phase transitions were first reported by Bridgman (1938 ) (V → VI), Goldsmith & White (1959 ) (I → II, II → III, III → IV and IV → V), Moudden et al. (1979 ) (phase II′′) and Banerji & Deb (2007 ) (VI → VII, VII → VIII and VIII → IX). Phase boundaries were investigated by Klimowski et al. (1976 ) and Benoit et al. (1983 ). Phase V crystallizes in Pnma (Wyckoff & Corey, 1932 ) and phase I in Pmc21 (Goldsmith & White, 1959 ). |