10.48788/DVUA/QTUEYVBoiko BohdanBoikoBohdan0009-0007-9359-1004Sumy State UniversityYermakov Maksym0000-0003-1170-6415Sumy State UniversityVasyliev Vitalii0000-0002-4601-856XSumy State UniversityPshenychnyi Roman0000-0002-2560-9379Sumy State UniversityDiachenko Oleksii0000-0003-2312-5255Sumy State UniversityDataverseUA2026PhysicsFourier transform infrared spectroscopy (FTIR), Infrared spectraDiachenko OleksiiSumy State University2026-08-052026-08-16Experimental numeric data1493601493651493671493601493671493601493727757text/tab-separated-valuestext/tab-separated-valuestext/tab-separated-valuestext/tab-separated-valuestext/tab-separated-valuestext/tab-separated-valuestext/tab-separated-valuestext/plain1.0CC0 1.0ATR-FTIR spectral data of Cu₂Zn₁₋ₓMgₓSnS₄ nanoparticle solutions with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6 in the wavenumber range of 400–4000 cm⁻¹.Cu₂Zn₁₋ₓMgₓSnS₄ nanoparticles were synthesized by the polyol method under laboratory conditions in an inert argon atmosphere. To prepare the samples for measurements, 10 mg of nanoparticle powder was dispersed in distilled water. ATR-FTIR spectra of the obtained solutions were recorded using a Nicolet iS20 Fourier-transform infrared spectrometer in the wavenumber range of 400–4000 cm⁻¹. The measurement results were exported in .CSV format using the instrument software.Ministry of Education and Science of Ukraine0124U000541