Infrared Studies of the Layered Compound ZnIn₂S₄

Abstract

lnfrared transmission and reflectance measurements are made on single crystals of the layered compound ZnIn,S, with C& structure in the range between 4000 and 33 em-,. According to group-theoretical analysis there are altogether 6A, + 6E zone centre optical modes which are both ir-and Raman-active. 4A1 + 4E modes should be intralayer modes, the remaining 2A, + 2E ones should be rigid layer modes with distinctly lower frequencies. The number of observed onephonon frequencies is found to be by far larger than expected. 16 frequencies of ZnIn,S, are found t o coincide very well with frequencies of certain critical-point phonons of cubic ZnS and with certain phonon frequencies of @-In&, respectively. The "additional" frequencies related to the number of frequencies predicted by group theory, which occur in the ir spectrum, are believed to arise from broken translational symmetry of the lattice.

Metal-Free Phosphorus-Doped ZnIn2S4 Nanosheets for Enhanced Photocatalytic CO2 Reduction

“…The Raman bands at 252 and 348 cm –1 are assigned to the longitudinal optical modes (LO 1 and LO 2 ). The Raman bands at 97 and 301 cm –1 could be related to F 2g mode and transverse optical mode (TO 2 ), respectively. , The Raman band at 128 cm –1 corresponds to the layered structure of hexagonal ZIS . It should be noted that the Raman band shifts from 128 to 131 cm –1 after P doping.…”

“…31,32 The Raman band at 128 cm −1 corresponds to the layered structure of hexagonal ZIS. 33 It should be noted that the Raman band shifts from 128 to 131 cm −1 after P doping. It may be caused by the doping effect, that is, phosphorus is successfully doped into ZIS and change its layered structure, which is consistent with the XRD results and morphology characterizations.…”

Preparation and optical investigation of the CdInGaS4 compound

“…I n 1950 Hahn and Klingler [l] synthesized these compounds by sintering together the binary components and they obtained polycrystalline powder. A second method giving better results is the vapour phase transport technique using iodine as a transport agent [a, 6,7,8]. I n 1969 Shand [9] applying the Stockbarger technique, prepared single crystals of CdIn,S,, ZnIn,S,, and CdGa,S, both from the constituent binary sulphides and the basic elements.…”