We show that K 2ZnSn 3S 8 is a phase-change system that exhibits tristability. Kinetic and thermodynamic forms of different compounds in the K/Zn/Sn/S system have been synthesized and thoroughly characterized. We report an example where slow and rapid cooling of a melt of K 2CO 3/S/Sn/Zn leads to different kinetically stable products (crystalline layered α-K 2ZnSn 3S 8, 1, and glassy K 2ZnSn 3S 8, A, respectively). These forms convert to a thermodynamically stable compound (crystalline cubic β-K 2ZnSn 3S 8, 2) upon annealing below their melting points. The band gaps of compounds 1, A, and 2 are 2.30, 2.15, and 2.55 eV, respectively.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry