<?xml version='1.0' encoding='UTF-8'?><codeBook xmlns="ddi:codebook:2_5" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="ddi:codebook:2_5 https://ddialliance.org/Specification/DDI-Codebook/2.5/XMLSchema/codebook.xsd" version="2.5"><docDscr><citation><titlStmt><titl>ATR-FTIR spectral data of Cu₂Zn₁₋ₓMgₓSnS₄ nanoparticle solutions</titl><IDNo agency="DOI">doi:10.48788/DVUA/QTUEYV</IDNo></titlStmt><distStmt><distrbtr source="archive">DataverseUA</distrbtr><distDate>2026-08-16</distDate></distStmt><verStmt source="archive"><version date="2026-08-16" type="RELEASED">1</version></verStmt><biblCit>Boiko Bohdan; Yermakov Maksym; Vasyliev Vitalii; Pshenychnyi Roman; Diachenko Oleksii, 2026, "ATR-FTIR spectral data of Cu₂Zn₁₋ₓMgₓSnS₄ nanoparticle solutions", https://doi.org/10.48788/DVUA/QTUEYV, DataverseUA, V1, UNF:6:PEBqcaGQ+SVGIDajqxLlZQ== [fileUNF]</biblCit></citation></docDscr><stdyDscr><citation><titlStmt><titl>ATR-FTIR spectral data of Cu₂Zn₁₋ₓMgₓSnS₄ nanoparticle solutions</titl><IDNo agency="DOI">doi:10.48788/DVUA/QTUEYV</IDNo></titlStmt><rspStmt><AuthEnty affiliation="Sumy State University">Boiko Bohdan</AuthEnty><AuthEnty affiliation="Sumy State University">Yermakov Maksym</AuthEnty><AuthEnty affiliation="Sumy State University">Vasyliev Vitalii</AuthEnty><AuthEnty affiliation="Sumy State University">Pshenychnyi Roman</AuthEnty><AuthEnty affiliation="Sumy State University">Diachenko Oleksii</AuthEnty></rspStmt><prodStmt><software>OMNIC</software><grantNo agency="Ministry of Education and Science of Ukraine">0124U000541</grantNo></prodStmt><distStmt><distrbtr source="archive">DataverseUA</distrbtr><contact affiliation="Sumy State University" email="a.dyachenko@ekt.sumdu.edu.ua">Diachenko Oleksii</contact><depositr>Boiko Bohdan</depositr><depDate>2026-08-05</depDate></distStmt><holdings URI="https://doi.org/10.48788/DVUA/QTUEYV"/></citation><stdyInfo><subject><keyword xml:lang="en">Physics</keyword><keyword vocab="LCSH" vocabURI="https://id.loc.gov/authorities/subjects/sh85136738.html">Fourier transform infrared spectroscopy (FTIR), Infrared spectra</keyword></subject><abstract date="2024-03-02">ATR-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.</abstract><sumDscr><dataKind>Experimental numeric data</dataKind></sumDscr><notes>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. 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