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). |