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Synthesis and Photoacoustic Spectra of Sm6Ga3.33S14

Photoacoustic spectra of ternary compounds, which involved Sm, Ga and S, were measured using powder samples. A chemical reaction in an evacuated silica tube was adopted as synthesis process. Obtained powder samples were identified using Sm6Ga3.33S14 by X-ray diffraction (XRD). Single crystals could be obtained from the samples, which were gradually cooled from 1100°C to 900°C for 4 d. These crystals, which are hexagonal and transparent yellow, could be identified using the superstructure of Sm6Ga3.33S14 by single-crystal X-ray diffraction. However, the samples with a short firing time at the temperature range from 1100°C to 900°C, included another red cluster. The red cluster could be estimated using SmGa2S4 or SmGa4S7 by scanning electron microscopy-energy-dispersive X-ray spectrometry (SEM-EDX). These two phases, indicated different photoacoustic signals corresponding to yellow crystals and red clusters in the wavelength region between 300 nm and 680 nm. Additionally, photoacoustic spectrum intensity decreased by extending firing time at the temperature range from 1100°C to 900°C. We considered the relationship between synthesis regime and photoacoustic spectra.