Far Infrared and Raman Optical Study of α‐ and β‐In₂S₃ Compounds

Abstract

The far infrared spectra are investigated of cubic wIn,S, and tetragonal P-In,S, for E _L c and E I I e configurations for samples obtained after quenching and also after a long period of annealing.The quenched samples show a high reflectivity in the low frequency range, which disappears after annealing. Also for ci-In,S, a greater number of bands appears after annealing. A large number of' peaks are also observed in light scattering, which are concentrated in the same narrow frequency range, as in the infrared spectra.Nous avons examine les spectres infrarouge lointain d'echantillons de a-In,S, cubique et de p-In,S, tetragonal dans des configurations E I c and E 11 c. Deux types d'hchantillons ont 6th BtudiBs:des Bchantillons trempBs et des Bchantillons recuits sur de longues phriodes. Les Bchantillons trempes montrent une forte rBflectivit6 L basse frhquence, qui disparait aprks recuit. Pour cc-In&, le nombre de bandes observBes augmente a p r h recnit. Un grand nombre de pics sont observbs aussi par diffusion de la lumiitre qui correspondent h des excitations situBes dans la mdme bande, Btroite, de frequence que celles observees en infrarouge lointain.

A Novel in Situ Oxidization–Sulfidation Growth Route via self-Purification Process to β-In2S3 Dendrites

“…Assuming that all peaks correspond to a first-order spectrum, the frequency at which each of them occurs would correspond to a normal mode of vibration. Fifteen normal modes of vibrations are thus observed, which correspond exactly to those given by a sample of b-In 2 S 3 with unpolarized light (36). The small change of peak intensity and the instability of baseline are due to the influence of fluorescence.…”

Single Phase Formation of CuInS2 Nanoparticles: Structural, Morphological, Thermal Studies with Annealing Effect

“…Sample B-CIS1 exhibits two broad peaks at 130 cm -1 and 302 cm -1 whereas single peak is obtained in sample B-CIS3 at 285 cm -1 . An intense mode at ~302 cm -1 in sample B-CIS1 has been previously noticed for indium rich CuInS 2 samples [15,[16][17] and β-In 2 S 3 presents a strong peak close to 302 cm -1 with A 1 symmetry [18]. Raman peak is observed at 285 cm -1 corresponds to the symmetric A 1 mode (pure anion vibration) of the sulphur lattice and found to be dominating Raman mode in device-quality CuInS 2 material [19].…”

Optical and structural properties of new chalcohalide glasses

“…According to EXAFS studies, In-In homopolar bonds are less probable being the expression of the absence of indium cluster with the respect of chemical order even for metal-metal bonding [14]. Nevertheless, this wide band centred at 242 cm À1 has also been related to the presence of [InS 6 ] octahedral sites [15,16] due to the presence of two really intense bands at 242 cm À1 and 308 cm À1 betaIn 2 S 3 spinel-like structure where In atoms occupy octahedral and a part of tetrahedral sites [22]. Due to the increase of In/Ge ratio with the gradual introduction of CsI in the binary sample, the expected decrease of the bands in the range of 340-430 cm À1 related to the vibrations of the [GeS 4 ] entities is observed.…”