High-pressure behavior of disodered kesterite-type Cu₂ZnSnS₄
Efthimiopoulos, Ilias and Küllmey, Tim and Speziale, Sergio and Pakhomova, Anna S. and Quennet, Marcel and Paulus, Beate and Ritscher, Anna and Lerch, Martin – 2021
We have investigated the high-pressure structural and vibrational behavior of the disordered kesterite-type Cu2ZnSnS4 compound at ambient temperature. Our experimental and theoretical investigations have revealed a clear structural transition to a GeSb-type phase close to 15 GPa, a tetragonally distorted variant of the NaCl-type phase. The latter transformation is accompanied by a cationic coordination increase from fourfold to sixfold with respect to the sulfur anions. In addition, a change in the compressibility rate was detected at about 8 GPa within the pressure stability range of the disordered kesterite-type phase. Upon decompression, a disordered zinc blende/sphalerite structure is recovered. We discuss our findings in close conjunction with our recent high-pressure work on the ordered Cu2ZnSnS4 modification.