CHEMICAL VAPOR TRANSPORT AND STRUCTURAL CHARACTERIZATION OF LAYERED MNIN2SE4 SINGLE-CRYSTALS

Large single crystals of the semiconductor MnIn2Se4 have been grown by the chemical vapour phase transport technique using AlCl3 as transport agent. The plate-like crystals had a size of up to 1 cm2. Thermodynamic considerations revealed that Mn-Al-Cl complexes are important for the chemical vapour transport. It was found that MnIn2Se4 has a rhombohedral unit cell belonging to the space group R3m with the lattice parameters of a = 4.05(6) Å and c = 39.4(9) Å at 300 K. The thermal expansion coefficients were investigated between 80 and 300 K. According to the crystal structure of ZnIn2S4, a crystal structure model of MnIn2Se4 was proposed, but the distribution of the cations Mn and In in the unit cell could not be completely determined. © 1990.